Engine fuel cut-off mechanism, engine fuel system and vehicle

Abstract

The invention discloses an engine fuel cut-off mechanism, an engine fuel system and a vehicle. The engine fuel cut-off mechanism comprises a flywheel and a fuel cut-off mechanism, the centrifuges are mounted on the flywheel and arranged in the circumferential direction of the flywheel; the fuel cut-off shell is provided with a fuel oil channel, and an opening communicated with the fuel oil channel is formed in the side, facing the flywheel, of the fuel cut-off shell; the sealing assembly is installed at the opening, and the centrifuge abuts against the sealing assembly outside the fuel cut-off shell; and when the rotating speed of the flywheel exceeds the rated rotating speed, the centrifugal device extends outwards in the radial direction, and the extending centrifugal device is suitable for pushing the sealing assembly to move towards the interior of the fuel oil channel so as to block the fuel oil channel. According to the engine fuel cut-off mechanism provided by the embodiment of the invention, the safety of vehicle driving is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle components, and in particular to an engine fuel cut-off mechanism, an engine fuel system and a vehicle. Background Art

[0002] With the development of engine technology, the society still uses mechanical fuel pumps to supply fuel to the engine. When the mechanical fuel pump controls the vehicle speed, when the engine reaches the maximum speed, the flyweight will expand, causing the sleeve compression spring to move upward, and the rod to move to reduce fuel to prevent the speed from continuing to increase, causing the flying vehicle phenomenon.

[0003] However, the engine fuel cut-off mechanism in the related art can only simply prevent the runaway phenomenon, but cannot achieve engine shutdown and parking, which makes the vehicle driving dangerous. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide an engine fuel cut-off mechanism, which improves the safety of vehicle driving.

[0005] Another object of the present invention is to provide an engine fuel system having the above-mentioned engine fuel cut-off mechanism.

[0006] Another object of the present invention is to provide a vehicle having the above engine fuel system.

[0007] According to an embodiment of the first aspect of the present invention, an engine fuel cut-off mechanism comprises: a flywheel; a centrifuge, wherein the centrifuge is mounted on the flywheel and arranged along the circumference of the flywheel; a fuel cut-off housing, wherein the fuel cut-off housing has a fuel passage, and an opening connected to the fuel passage is configured on the side of the fuel cut-off housing facing the flywheel; a sealing assembly, wherein the sealing assembly is mounted on the opening, and the centrifuge stops at the sealing assembly outside the fuel cut-off housing; wherein the centrifuge extends radially outward when the rotation speed of the flywheel exceeds the rated rotation speed, and the extended centrifuge is suitable for pushing the sealing assembly to move into the fuel passage to block the fuel passage.

[0008] According to the engine oil cut-off mechanism of the embodiment of the present invention, the centrifuge, as a key component connecting the flywheel and the oil cut-off housing, relies on changes in the engine speed to control the flow of fuel. When the engine speed reaches the maximum, the centrifuge will extend radially outward due to the action of centrifugal force. When the engine is running at a high speed, if there is no effective oil circuit control, excessive fuel may flow into the engine, resulting in the continuous occurrence of the runaway phenomenon. The extension action of the centrifuge prevents this risk and achieves safety protection by actively isolating the fuel channel.

[0009] When the vehicle is running at high speed, if the engine speed continues to increase beyond the normal working range, the traditional engine fuel cut-off mechanism may not be able to respond and adjust the fuel flow in time, thus causing the vehicle to lose control. In the engine fuel cut-off mechanism of the embodiment of the present invention, when the engine reaches the maximum speed, the centrifuge extends outward, which pushes the sealing component to move into the fuel channel to form an effective seal. The sealing component can immediately block the fuel passage to prevent excessive fuel from entering the engine, causing the engine to fail to work normally, reducing the risk of vehicle runaway, thereby protecting the safety of the engine and the entire vehicle.

[0010] Therefore, the engine fuel cut-off mechanism according to the embodiment of the present invention improves the safety of vehicle driving.

[0011] According to some embodiments of the present invention, the centrifuge includes: a centrifugal spring, one end of which is connected to the flywheel and the other end of which extends radially outward from the flywheel; and a centrifugal stopper, which is connected to the other end of the centrifugal spring and stops at the sealing assembly.

[0012] According to some embodiments of the present invention, one end of the centrifugal stopper is connected to the centrifugal spring and the other end is rotatably connected to the flywheel.

[0013] According to some embodiments of the present invention, two opposite side surfaces of the centrifugal stopper in the thickness direction are both configured to be arc-shaped, and the thickness of the centrifugal stopper changes gradually along the length direction.

[0014] According to some embodiments of the present invention, the oil cut-off housing is configured with a slide groove at a position corresponding to the opening, the slide groove extends perpendicularly to the fuel channel, and the sealing assembly moves in coordination with the slide groove.

[0015] According to some embodiments of the present invention, an inner side wall of the oil cut-off housing opposite to the slide groove is configured with a receiving groove, the receiving groove cooperates with an end of the sealing assembly, and the end of the sealing assembly is suitable for extending into the receiving groove.

[0016] According to some embodiments of the present invention, the oil cut-off housing is configured with a detachable cover at the bottom of the accommodating groove.

[0017] According to some embodiments of the present invention, a limit spring is constructed in the accommodating groove, one end of the limit spring is connected to the groove bottom of the accommodating groove, and the other end is connected to the sealing assembly.

[0018] According to some embodiments of the present invention, the sealing assembly includes: a plunger, which is arranged on a side of the slide groove facing the fuel channel, and the plunger is sealed with a side wall of the slide groove; a ratchet rod, which is connected to a side of the plunger facing outside a groove of the slide groove, and one end of the ratchet rod extends out of the slide groove.

[0019] According to some embodiments of the present invention, a sealing member is configured on the outer circumferential surface of the plunger. The sealing member is disposed on a side of the slide groove adjacent to the plunger, and the sealing member is sealed with the outer circumferential surface of the plunger.

[0020] According to some embodiments of the present invention, the inner side wall of the slide slot is configured with a locking slot, and the side surface of the ratchet rod is configured with a locking piece that engages with the locking slot.

[0021] According to some embodiments of the present invention, the latch comprises: a pawl, one end of which is hingedly connected to the ratchet rod; an elastic connecting member, the elastic connecting member is located on a side of the pawl outside the groove facing the slide slot, and the elastic connecting member is connected to an end of the pawl away from the hinge.

[0022] An engine fuel system according to an embodiment of a second aspect of the present invention comprises an engine fuel cut-off mechanism according to an embodiment of the first aspect of the present invention.

[0023] A vehicle according to an embodiment of the third aspect of the present invention comprises an engine fuel system according to an embodiment of the second aspect of the present invention.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a structural schematic diagram of an engine fuel cut-off mechanism according to an embodiment of the present invention; Figure 2 is another structural schematic diagram of an engine fuel cut-off mechanism according to an embodiment of the present invention; Figure 3 yes Figure 2 A partial schematic diagram of .

[0026] Reference numerals: Engine oil cut-off mechanism 1, flywheel 100, centrifuge 200, oil cut-off housing 300, sealing assembly 400, Fuel channel 301, opening 302, slide groove 303, clamping groove 304, receiving groove 305, limit spring 306, Centrifugal spring 210, centrifugal stopper 220, cover body 310, The plunger 410 , the ratchet rod 420 , the snap member 430 , the sealing member 411 , the ratchet 431 , and the elastic connecting member 432 . DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0030] In the description of the present invention, "plurality" means two or more than two, and "several" means one or more.

[0031] The following describes an engine fuel cutoff mechanism 1 according to an embodiment of the present invention with reference to the accompanying drawings.

[0032] like Figure 1-Figure 3 As shown, the engine oil cut-off mechanism 1 according to the first embodiment of the present invention includes a flywheel 100 , a centrifuge 200 , an oil cut-off housing 300 and a sealing assembly 400 .

[0033] The centrifuge 200 is mounted on the flywheel 100 and arranged along the circumference of the flywheel 100. The oil cut-off housing 200 has a fuel passage 301, and an opening 302 communicating with the fuel passage 301 is configured on one side of the oil cut-off housing 300 facing the flywheel 100. The sealing assembly 400 is mounted on the opening 302, and the centrifuge 200 abuts against the sealing assembly 400 outside the oil cut-off housing 300. The centrifuge 200 extends radially outward when the speed of the flywheel 100 exceeds the rated speed, and the extended centrifuge 200 is suitable for pushing the sealing assembly 400 to move into the fuel passage 301 to block the fuel passage 301.

[0034] For example, when the engine is operating normally, the sealing assembly 400 is located outside the fuel passage 301, the fuel passage 301 is a passage, and the engine is operating normally; when the engine is overrunning, the engine speed suddenly increases, and the centrifugal force of the centrifuge 200 on the flywheel 100 increases. Under the action of the centrifugal force, the centrifuge 200 begins to separate from the flywheel 100 body, increasing the rotation diameter, and the outwardly expanding centrifuge 200 pushes the sealing assembly 400, and the sealing assembly 400 gradually blocks the fuel passage 301, cutting off the engine from fuel, causing the engine to fail to operate normally, and the vehicle to shut down.

[0035] According to the engine oil cut-off mechanism 1 of the embodiment of the present invention, the centrifuge 200, as a key component connecting the flywheel 100 and the oil cut-off housing 300, relies on the change in the engine speed to control the flow of fuel. When the engine speed reaches the maximum, the centrifuge 200 will extend radially outward due to the action of centrifugal force. When the engine is running at a high speed, if there is no effective oil circuit control, it may cause excessive fuel to flow into the engine, so that the runaway phenomenon continues to occur. The extension action of the centrifuge 200 prevents this risk and achieves safety protection by actively isolating the fuel channel 201.

[0036] When the vehicle is running at high speed, if the engine speed continues to increase beyond the normal working range, the traditional engine fuel cut-off mechanism may not be able to respond and adjust the fuel flow in time, thus causing the vehicle to lose control. In the engine fuel cut-off mechanism 1 of the embodiment of the present invention, when the engine reaches the maximum speed, the centrifuge 200 extends outward, which pushes the sealing component 400 to move toward the fuel channel 201 to form an effective seal. The sealing component 400 can immediately block the fuel channel 201 to prevent excessive fuel from entering the engine, so that the engine cannot work normally, reduce the risk of vehicle runaway, and thus protect the safety of the engine and the whole vehicle.

[0037] Therefore, the engine fuel cut-off mechanism 1 according to the embodiment of the present invention improves the safety of vehicle driving.

[0038] In some optional embodiments of the present invention, Figure 1 and Figure 2 As shown, the centrifuge 200 includes a centrifugal spring 210 and a centrifugal stopper 220. One end of the centrifugal spring 210 is connected to the flywheel 100 and the other end extends radially outward of the flywheel 100. The centrifugal stopper 220 is connected to the other end of the centrifugal spring 210, and the centrifugal stopper 220 stops at the sealing assembly 400.

[0039] The centrifugal spring 210 converts the rotational motion of the flywheel 100 into centrifugal force. As the engine speed increases, the centrifugal force on the centrifugal spring 210 also increases. This change in force enables the centrifugal spring 210 to produce corresponding actions at a certain speed. That is, when the engine reaches the maximum speed, the centrifugal spring 210 pushes the centrifugal block 220 toward the sealing assembly 400 through sufficient centrifugal force, thereby controlling the cut-off of the oil flow.

[0040] At the same time, in the case of engine overspeed, the centrifugal block 220 can quickly perform the fuel cut-off operation, thereby realizing automatic fuel cut-off and flameout of the vehicle, thereby improving the safety of vehicle driving.

[0041] In some optional embodiments of the present invention, Figure 1 and Figure 2 As shown, one end of the centrifugal stopper 220 is connected to the centrifugal spring 210 and the other end is rotatably connected to the flywheel 100 .

[0042] When the engine speed changes, the centrifugal block 220 can automatically adjust its position according to the force change of the centrifugal spring 210, thereby achieving oil quantity control. When the engine speed increases, the centrifugal force causes the centrifugal block 220 to swing outward, pushing it to stop at the sealing assembly 400, ensuring that the centrifugal block 220 can quickly and effectively perform the oil cut-off function under high speed conditions, protecting the vehicle from damage.

[0043] In some optional embodiments of the present invention, Figure 1 and Figure 2 As shown, the two opposite sides of the centrifugal stopper 220 in the thickness direction are both configured to be arc-shaped, and the thickness of the centrifugal stopper 220 changes gradually along the length direction. Among them, the outer peripheral surface of the centrifugal stopper 220 is an arc-shaped structure, which can increase the contact area between the centrifugal stopper 220 and the sealing assembly 400, thereby increasing the driving force on the sealing assembly 400 and improving the working efficiency of the engine oil cut-off mechanism 1. At the same time, the gradual thickness means that the centrifugal stopper 220 can reduce the overall weight of the centrifugal stopper 220 without reducing the structural strength, thereby improving the overall output and fuel economy of the engine and reducing the burden caused by gravity.

[0044] In addition, the thickness gradually changes along the length direction so that the centrifugal stopper 220 is subjected to uniform force at different positions, and can better withstand the influence of centrifugal force, thereby ensuring the normal operation of the engine.

[0045] In some optional embodiments of the present invention, Figure 1 and Figure 2 As shown, the fuel cut-off housing 300 is configured with a slide groove 303 at a corresponding position of the opening 302 . The slide groove 303 extends perpendicularly to the fuel channel 301 , and the sealing assembly 400 moves in coordination with the slide groove 303 .

[0046] The slide groove 303 can provide a clear guide path for the sealing assembly 400, ensuring that the sealing assembly 400 moves along a predetermined track during movement, which helps to keep the sealing assembly 400 in the correct working position, thereby ensuring the normal function of the engine oil cut-off mechanism 1. At the same time, the slide groove 303 helps to reduce the friction of the sealing assembly 400 during the sliding process, so that the sealing assembly 400 can move more smoothly, reduce energy loss, and improve the overall working efficiency of the engine oil cut-off mechanism 1.

[0047] In addition, the slide groove 303 can effectively limit the movement range of the sealing assembly 400, ensuring its accurate positioning at the opening 302. When the fuel channel 301 needs to be closed, the slide groove 303 can ensure that the sealing assembly 400 is in the correct position, thereby effectively cutting off the fuel.

[0048] In some optional embodiments of the present invention, Figure 1 and Figure 2 As shown, the inner side wall of the oil cut-off housing 300 opposite to the slide groove 303 is configured with a receiving groove 305, and the receiving groove 305 matches the end of the sealing assembly 400, and the end of the sealing assembly 400 is suitable for extending into the receiving groove 305. When the engine speed is at a normal speed, the end of the sealing assembly 400 is at the bottom of the receiving groove 305. When the engine is at the highest speed, the sealing assembly 400 moves in the vertical direction due to the force of the centrifuge 200, and the end of the sealing assembly 400 gradually extends into the receiving groove 305.

[0049] The receiving groove 305 cooperates with the end of the sealing assembly 400 so that the sealing assembly 400 can effectively extend into the receiving groove 305, thereby forming a good sealing interface, effectively preventing fuel leakage during operation, and ensuring the normal operation and safety of the engine fuel cut-off mechanism 1.

[0050] In some optional embodiments of the present invention, Figure 1 and Figure 2 As shown, the oil cut-off housing 300 is configured with a detachable cover 310 at the bottom of the receiving groove 305. The cover 310 is connected to the oil cut-off housing 300 by fasteners, and an O-ring structure is provided between the cover 310 and the oil cut-off housing 300 to ensure that the oil will not leak from the cover 310.

[0051] The cover 310 allows the sealing component 400 to be disassembled from the top. When the engine is stopped and the cause of the vehicle runaway is checked, after the fault is eliminated, the technician can quickly disassemble the cover 310, and the sealing component 400 can be taken out from the top and then installed from the bottom for continued use. The detachable cover 310 can easily remove and reinstall the sealing component 400, thereby improving its reuse efficiency and improving cost control.

[0052] At the same time, the cover 310 can be tightly combined with the receiving groove 305 after installation to form a complete sealing structure, which helps to prevent fuel leakage, ensure that the engine system maintains good sealing performance during operation, and prevent pollutants from entering the system.

[0053] In some optional embodiments of the present invention, Figure 1 and Figure 2 As shown, a limit spring 306 is constructed in the receiving groove 305 , one end of the limit spring 306 is connected to the groove bottom of the receiving groove 305 , and the other end is connected to the sealing assembly 400 .

[0054] When the engine is at a normal speed, the limit spring 306 is in a free expansion and contraction state. When the engine is at the highest speed, the end of the sealing assembly 400 gradually extends into the receiving groove 305, and the limit spring 306 is in a contracted state. The limit spring 306 of the sealing assembly 400 is fixed to the bottom of the receiving groove 305 at one end and connected to the sealing assembly 400 at the other end, thereby ensuring that the sealing assembly 400 is always in a predetermined position. This stability is crucial to the normal operation of the engine oil cut-off mechanism 1, ensuring the normal operation of the engine.

[0055] In some optional embodiments of the present invention, Figure 1 and Figure 2 As shown, the sealing assembly 400 includes a plunger 410 and a ratchet rod 420. The plunger 410 is disposed on the side of the slide groove 303 facing the fuel channel 301, and the plunger 410 is sealed with the side wall of the slide groove 303. The ratchet rod 420 is connected to the side of the plunger 410 facing the notch outside the slide groove 303, and one end of the ratchet rod 420 extends out of the slide groove 303. The plunger 410 and the ratchet rod 420 are fixed together by a ring connection, and the limit spring 306 is fixed on one side of the plunger 410. When the engine speed is the highest, the centrifugal block 220 contacts the ratchet rod 420.

[0056] The plunger 410 is arranged on the side of the slide groove 303 facing the fuel channel 301 and is sealed with the side wall of the slide groove 303. When the engine speed is the highest, the plunger 410 moves in the slide groove 303, which can effectively block the fuel channel 301, cut off the engine fuel, and the engine cannot work, thereby stopping the engine from working.

[0057] The ratchet rod 420 is connected to the outside of the plunger 410 and extends out of the slide groove 303, which can provide additional mechanical support during the operation of the plunger 410, ensure the stability of the movement of the plunger 410, and prevent the seal from failing due to vibration or impact. At the same time, the ratchet rod 420 also has the function of preventing the plunger 410 from moving in the opposite direction. When the plunger 410 moves to one side under normal working conditions, the ratchet rod 420 can lock its position to prevent the plunger from accidentally returning to its original position due to pressure changes or other factors, thereby ensuring the normal operation of the engine oil cut-off mechanism.

[0058] In some optional embodiments of the present invention, Figure 1 and Figure 2 As shown, a sealing member 411 is configured on the outer circumference of the plunger 410 . The sealing member 411 is disposed on a side of the slide groove 303 adjacent to the plunger 410 . The sealing member 411 is sealed with the outer circumference of the plunger 410 .

[0059] The seal 411 is located on the inner circumference of the slide groove 303. When the engine is at a normal speed, the seal 411 can effectively prevent the oil leakage in the fuel channel 301 to ensure the normal operation of the engine.

[0060] In some optional embodiments of the present invention, Figure 1 and Figure 2 As shown, the inner side wall of the slide slot 303 is configured with a locking slot 304 , and the side surface of the ratchet rod 420 is configured with a locking member 430 that engages with the locking slot 304 .

[0061] For example, the slot 304 can be distributed at multiple heights of the inner wall of the slide groove 303. When the engine is at normal speed, the latch 430 engages with the slot 304 adjacent to the ratchet rod 420. When the engine is at the highest speed, the latch 430 engages with the slot 304 adjacent to the plunger 410.

[0062] The position of the ratchet rod 420 can be effectively locked by the slot 304 and the latch 430, thereby ensuring that the plunger 410 remains stable under a specific operating state and preventing the plunger 410 from accidentally moving during operation. This locking mechanism can improve the safety and reliability of the engine fuel cut-off mechanism 1.

[0063] In some optional embodiments of the present invention, Figure 3 As shown, the buckle 430 includes a pawl 431 and an elastic connector 432. One end of the pawl 431 is hingedly connected to the ratchet rod 420. The elastic connector 432 is located on a side of the pawl 431 outside the notch facing the slide slot 303, and the elastic connector 432 is connected to an end of the pawl 431 away from the hinge.

[0064] The hinged structure of the pawl 431 and the ratchet rod 420 can automatically snap the pawl 431 into the slot 304 under certain conditions (such as when the centrifugal force reaches a certain level), thereby automatically locking the ratchet rod 420 and ensuring that the fuel channel 301 is closed, cutting off the engine from fuel and causing the engine to fail to work normally.

[0065] At the same time, when the engine speed is too high, the centrifugal force will cause the pawl 431 to automatically engage in the engaging groove 304, thereby ensuring that the engine is cut off from fuel in high-risk situations, thereby improving the safety of vehicle driving.

[0066] The following describes an engine fuel system (not shown) according to an embodiment of the present invention.

[0067] An engine fuel system according to an embodiment of a second aspect of the present invention comprises an engine fuel cut-off mechanism 1 according to an embodiment of the first aspect of the present invention.

[0068] The engine fuel system implemented according to the present invention improves the safety of vehicle driving by utilizing the engine fuel cut-off mechanism 1 of the above-mentioned embodiment of the present invention.

[0069] A vehicle (not shown) according to an embodiment of the present invention will be described below.

[0070] A vehicle according to an embodiment of the present invention comprises the engine fuel system of the above embodiment of the present invention.

[0071] The vehicle according to the embodiment of the present invention improves the driving safety of the vehicle by utilizing the engine fuel system according to the above-mentioned embodiment of the present invention.

[0072] The engine fuel cut-off mechanism 1, the engine fuel system and other components and operations of the vehicle according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0074] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An engine oil cut-off mechanism, characterized in that: include: flywheel; a centrifuge, the centrifuge being mounted on the flywheel and arranged along the circumference of the flywheel; A fuel cut-off housing, wherein the fuel cut-off housing has a fuel passage, and a side of the fuel cut-off housing facing the flywheel is configured with an opening communicating with the fuel passage; A sealing assembly, the sealing assembly is installed at the opening, and the centrifuge is stopped at the sealing assembly outside the oil cut-off housing; Wherein, the centrifuge extends radially outward when the rotation speed of the flywheel exceeds the rated rotation speed, and the extended centrifuge is suitable for pushing the sealing assembly to move into the fuel channel to block the fuel channel.

2. The engine oil cut-off mechanism according to claim 1, characterized in that: The centrifuge comprises: a centrifugal spring, one end of which is connected to the flywheel and the other end of which extends radially outward from the flywheel; A centrifugal stopper is connected to the other end of the centrifugal spring and stops at the sealing assembly.

3. The engine oil cut-off mechanism according to claim 2, characterized in that: One end of the centrifugal stopper is connected to the centrifugal spring and the other end is rotatably connected to the flywheel.

4. The engine oil cut-off mechanism according to claim 3, characterized in that: The two opposite side surfaces of the centrifugal stopper in the thickness direction are both configured to be arc-shaped, and the thickness of the centrifugal stopper changes gradually along the length direction.

5. The engine oil cut-off mechanism according to claim 1, characterized in that: The oil cut-off housing is configured with a slide groove at a position corresponding to the opening, the slide groove extends perpendicularly to the fuel channel, and the sealing assembly moves in coordination with the slide groove.

6. The engine oil cut-off mechanism according to claim 5, characterized in that: An inner side wall of the oil cut-off housing opposite to the slide groove is configured with a receiving groove, the receiving groove matches with the end of the sealing assembly, and the end of the sealing assembly is suitable for extending into the receiving groove.

7. The engine oil cut-off mechanism according to claim 6, characterized in that: The oil cut-off housing is configured with a detachable cover at the bottom of the accommodating groove.

8. The engine oil cut-off mechanism according to claim 6, characterized in that: A limit spring is constructed in the accommodating groove, one end of the limit spring is connected to the groove bottom of the accommodating groove, and the other end is connected to the sealing assembly.

9. The engine oil cut-off mechanism according to claim 5, wherein the sealing assembly comprises: A plunger, the plunger is arranged on a side of the chute facing the fuel channel, and the plunger is sealed with a side wall of the chute; A ratchet rod is connected to a side of the plunger facing outside the notch of the slide slot, and one end of the ratchet rod extends out of the slide slot.

10. The engine fuel cut-off mechanism according to claim 9, characterized in that: A sealing member is configured on the outer circumferential surface of the plunger. The sealing member is disposed on a side of the slide groove adjacent to the plunger, and the sealing member is sealed with the outer circumferential surface of the plunger.

11. The engine fuel cut-off mechanism according to claim 9, characterized in that: The inner side wall of the slide slot is configured with a clamping slot, and the side surface of the ratchet rod is configured with a buckle piece engaged with the clamping slot.

12. The engine fuel cut-off mechanism according to claim 11, characterized in that: The buckle comprises: A ratchet, one end of which is hingedly connected to the ratchet rod; An elastic connecting piece is located on a side of the pawl outside the notch facing the sliding slot, and the elastic connecting piece is connected to an end of the pawl away from the hinge.

13. An engine fuel system, characterized in that: include: An engine oil cut-off mechanism according to any one of claims 1 to 12.

14. A vehicle, characterized in that: include: The engine fuel system of claim 13.

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