Engine hood lock body assembly

Abstract

The invention discloses an engine hood lock body assembly which comprises a lock body bottom plate, a cover plate, a ratchet wheel detachably connected with the lock body bottom plate and the cover plate, a pawl and a pawl return spring arranged on the cover plate, one end of the pawl return spring is connected with the cover plate, and the ratchet wheel is rotatably arranged on a first shaft inserted into the lock body bottom plate and the cover plate in a sleeving mode. The pawl is rotatably sleeved on a second shaft inserted in the lock body bottom plate and the cover plate, the upper parts of the lock body bottom plate and the cover plate are respectively provided with a first notch and a second notch for the lock catch to pass through, the lock body bottom plate is provided with a first hole and a second hole, and the first hole and the second hole are symmetrically arranged on two sides of the first notch on the lock body bottom plate; the first shaft is sleeved with a ratchet wheel return spring with one end connected with the cover plate, and the other end of the ratchet wheel return spring is connected with the ratchet wheel. The engine hood lock body assembly is wider in compatibility and adaptability, resistant to vibration and impact force, and capable of improving the working stability and prolonging the service life of the engine hood lock body assembly.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, specifically to an engine hood lock assembly. Background Technology

[0002] As society and the economy develop and people's living standards continue to improve, their demands for the comfort, convenience, safety, and practicality of car handling are also increasing.

[0003] Existing technologies, such as the Chinese invention patent CN110593677A which discloses an engine hood lock assembly, employ an asymmetrical arrangement of the ratchet's shaft hole and the pawl's shaft hole. This not only results in a loose internal lock structure and an excessively thick overall shape, but also, due to the asymmetrical arrangement of the ratchet and pawl, the lock body can only be installed in one fixed direction. For incompatible vehicle models, the installation position needs to be redesigned, increasing development costs. Furthermore, during use, issues arise such as unilateral stress concentration, uneven force distribution, easy pawl wobbling, poor vibration resistance, and short service life. Therefore, a new technical solution is urgently needed to address at least one of these technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide an engine hood lock assembly that can solve the problem that the lock assembly can only be installed in a fixed direction when facing incompatible vehicle models, as well as other technical problems such as stress concentration on one side, easy pawl deflection, poor vibration resistance, and short service life.

[0005] To achieve the above-mentioned technical objectives and requirements, the technical solution adopted by this invention is as follows: an engine hood lock assembly, comprising a lock body base plate, a cover plate, a ratchet and a pawl detachably connected to the lock body base plate and the cover plate, a pawl return spring disposed on the cover plate and connected at one end to the cover plate, the ratchet being rotatably sleeved on a first shaft inserted into the lock body base plate and the cover plate, the pawl being rotatably sleeved on a second shaft inserted into the lock body base plate and the cover plate, the lock body base plate and the cover plate respectively having a first notch and a second notch for the latch to pass through, the lock body base plate having a first hole and a second hole, the cover plate having a third hole and a fourth hole for mating installation, the first hole and the second hole being symmetrically arranged on both sides of the first notch on the lock body base plate, a ratchet return spring with one end connected to the cover plate being sleeved on the first shaft, and the other end of the ratchet return spring being connected to the ratchet.

[0006] As a preferred technical solution, the upper space of the lock body base plate is provided with an elastic ejector. The elastic ejector is sleeved on the stretching part provided on the upper part of the lock body base plate. One end of the elastic ejector cooperates with the ejection limiting edge of the cover plate, and the other end cooperates with the limiting angle edge of the lock body base plate.

[0007] As a preferred technical solution, the ratchet has a follower part, a first abutting part and a second abutting part, the pawl has a first stop part and a second stop part, a receiving section is provided between the first stop part and the second stop part, a pulling part is provided at the bottom of the pawl, a hook is provided at the end of the pulling part, and the free end of the pawl return spring abuts against the pulling part.

[0008] As a preferred technical solution, the follower part, the first abutment part and the second abutment part of the ratchet are arranged in clockwise order, and an opening limit edge is vertically arranged on the upper left side of the lock body base plate. A ratchet limit part is arranged on the side of the ratchet facing the opening limit edge. In the fully open state, the ratchet limit part abuts against the opening limit edge.

[0009] As a preferred technical solution, the bottom plate of the lock body is provided with irregularly shaped protruding ribs on the side facing the cover plate.

[0010] As a preferred technical solution, the rib has an arc segment arranged along the rotation direction of the first abutment portion and the second abutment portion, and a curved segment intersecting the arc segment, with one end of the curved segment extending toward the first hole.

[0011] As a preferred technical solution, the cover plate has a recessed surface on the side opposite to the bottom plate of the lock body, and the pawl return spring abuts against the recessed surface.

[0012] As a preferred technical solution, the cover plate is provided with a slot that passes through it along the axial direction, and the limiting angle side is inserted into the slot.

[0013] As a preferred technical solution, the lock body base plate is provided with a switch sub-assembly, the switch sub-assembly has a micro switch, the micro switch is located below the ratchet, the bottom of the ratchet is provided with a micro-movement protrusion, and the micro-movement protrusion cooperates with the micro-movement lever of the micro switch.

[0014] As a preferred technical solution, the micro switch is connected to the locking base plate via a fixing seat. The lower left part of the locking base plate is provided with a first open slot and a second open slot that pass through it axially. The fixing seat has a mounting groove, and the micro switch is installed in conjunction with the mounting groove. The micro switch is located between the first open slot and the second open slot. The fixing seat has a first skirt and a second skirt, which are respectively engaged in the first open slot and the second open slot. The first skirt and the second skirt abut against the side of the locking base plate away from the cover plate. The first skirt is provided with at least one round protrusion, and the locking base plate is provided with a locking point that passes through it axially. The round protrusion is engaged in the locking point.

[0015] The beneficial effects of this invention are: 1) The first and second holes are arranged symmetrically on both sides of the first notch on the base plate of the lock body. When facing unsuitable car models, the lock body can be installed in both directions, reducing technical development costs. It can solve the technical problems of stress concentration on one side, uneven force, and vibration loosening. It is resistant to vibration and impact, thereby improving the working stability and service life of the lock body components. 2) When the hood is closed, the elastic ejector contacts the latch to provide resistance and act as a buffer. When the hood is opened, the elastic ejector provides a spring force, allowing the hood to open instantly and preventing jamming when opening the hood. The elastic ejector can provide a wider range of spring force, making it more compatible and applicable to a wider range of vehicle models. 3) During the opening and closing of the engine hood, the ratchet moves with the latch on the engine hood. The lever of the micro switch contacts and separates from the ratchet's micro-movement protrusion, providing feedback to indicate that the engine hood is open, attracting the driver's attention, avoiding unnecessary risks, and improving the user's sense of security. 4) In the fully open state, the opening limit edge abuts against the ratchet limit part to prevent the ratchet from overtraveling; the limit angle edge not only limits the pawl return spring, but also engages with the cover plate to limit the cover plate; the irregular ribs on the lock body base plate can reduce the large-area friction of the ratchet during movement, while controlling the axial movement clearance of the ratchet; the improvements of the above technical solutions can improve the operational reliability of the lock body assembly during operation. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the lock body assembly without the installed cover according to an embodiment of the present invention; Figure 2 This is a structural diagram of the mounting cover of a lock body assembly provided in one embodiment of the present invention; Figure 3 This is an exploded view of a lock body assembly provided in one embodiment of the present invention; Figure 4 This is a diagram showing the engagement of the pawl and ratchet when the lock body assembly is fully locked according to an embodiment of the present invention; Figure 5 This is a transitional position diagram of the first opening of the lock body assembly provided in an embodiment of the present invention; Figure 6 This is a diagram showing the engagement of the pawl and ratchet in a partially locked state of a lock body assembly according to an embodiment of the present invention; Figure 7 This is a diagram showing the completely separated position of the pawl and ratchet of a lock body assembly provided in one embodiment of the present invention; Figure 8 This is a diagram showing the fully open positions of the pawl and ratchet of a lock body assembly according to an embodiment of the present invention; Figure 9 This is a structural diagram of the transition position of the lock body assembly before it is fully locked, according to an embodiment of the present invention.

[0017] exist Figures 1-9 In the middle, 1. Lock body base plate; 101. First notch; 102. First hole; 103. Second hole; 104. Limiting corner edge; 105. Opening limiting edge; 106. Protruding rib; 1061. Arc segment; 1062. Curved segment; 107. Tensioning part; 108. First locking edge; 109. First opening locking groove; 110. Second opening locking groove; 111. Locking point; 112. Notch; 113. Baffle; 2. Cover plate; 201. Second notch; 202. Third hole; 203. Fourth hole; 204. Slot; 205. Lower limiting edge; 206. Second locking edge; 207. Push-out limiting edge; 208. Recessed surface; 3. Ratchet; 301. Follower part; 302. First abutment part; 303. 304. Connecting block; 305. Ratchet limiting part; 306. Micro-motion protrusion; 307. Guide cylinder; 4. Pawl; 401. First stop part; 402. Second stop part; 403. Receiving section; 404. Pulling part; 4041. Hook; 405. Pawl limiting part; 5. Elastic ejector; 6. Ratchet return spring; 7. Pawl return spring; 8. First shaft; 9. Second shaft; 10. Switch sub-assembly; 1001. Micro switch; 1002. Sleeve; 1003. Cable tie; 11. Fixing seat; 1101. Mounting groove; 1102. First skirt; 1103. Second skirt; 1104. Round protrusion; 1105. Square protrusion; 12. Cover; 13. Shock-absorbing layer. Detailed Implementation

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "head", "tail", "top", "bottom", "left", "right", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0020] Please see Figures 1-9An embodiment of the present invention provides an engine hood lock assembly, including a lock body base plate 1, a cover plate 2, a ratchet 3 and a pawl 4 detachably connected to the lock body base plate 1 and the cover plate 2, and a pawl return spring 7 disposed on the cover plate 2 and connected at one end to the cover plate 2. The ratchet 3 is rotatably sleeved on a first shaft 8 inserted into the lock body base plate 1 and the cover plate 2, and the pawl 4 is rotatably sleeved on a second shaft 9 inserted into the lock body base plate 1 and the cover plate 2. The upper parts of the lock body base plate 1 and the cover plate 2 are respectively provided with a first notch 101 and a second notch 201 for the latch to pass through. The lock body base plate 1 is provided with a first hole 102 and a second hole 201. The cover plate 2 has a second hole 103, and a third hole 202 and a fourth hole 203 that can be fitted together. The first hole 102 and the second hole 103 are symmetrically arranged on both sides of the first notch 101 on the lock body base plate 1. A ratchet return spring 6 with one end connected to the cover plate 2 is sleeved on the first shaft 8, and the other end of the ratchet return spring 6 is connected to the ratchet 3. The first hole 102 and the second hole 103 are symmetrically arranged on both sides of the first notch 101 on the lock body base plate 1. Traditional asymmetrical layouts are prone to problems such as stress concentration on one side, easy wobbling of the pawl 4, poor vibration resistance, and short service life. The symmetrical layout of the first hole 102 and the second hole 103 provides structural stability, balanced force, avoids stress concentration on one side, and the structural stability results in good vibration resistance and impact resistance, thereby extending the service life.

[0021] The engine hood lock assembly and buckle were fixed on the vibration table according to the actual vehicle condition. Vibration resistance tests were conducted on the engine hood lock in the X, Y, and Z directions according to the table below. The engine hood lock did not open unexpectedly during the test, indicating good vibration resistance.

[0022]

[0023] This invention relates to a frequency sweep vibration test, in the 17-500Hz range, performing 4 frequency sweep vibrations every 120 minutes; and in the 500-2000Hz range, performing 4 frequency sweep vibrations every 120 minutes. The prior art described in the background generally uses fixed-frequency vibration as shown in the table above for vibration resistance testing, which cannot guarantee good vibration resistance under frequency sweep vibration conditions with a frequency increase of approximately 20 times.

[0024] The engine hood latch is subjected to alternating loads from vehicle body idling vibration (5-20Hz) and road bump vibration (20-100Hz) during driving. The symmetrical layout of the first hole 102 and the second hole 103 can keep the natural frequencies of the ratchet 3 and pawl 4 away from the vehicle body vibration frequency, avoid resonance, and reduce the dynamic stress on the meshing surface under dynamic load.

[0025] Impact resistance tests were conducted on the engine hood lock assembly and latch. In the fully locked state, with a preload of 845 N and an impact load of 55 J, the engine hood lock assembly and latch did not disengage. In the semi-locked state, with a preload of 845 N and an impact load of 23 J, the engine hood lock assembly and latch did not disengage, demonstrating good structural stability.

[0026] like Figures 1-9 As shown, an elastic ejector 5 is provided in the upper space of the lock body base plate 1. The elastic ejector 5 is sleeved on the tension part 107 provided on the upper part of the lock body base plate 1. One end of the elastic ejector 5 cooperates with the ejection limiting edge 207 of the cover plate 2, and the other end cooperates with the limiting angle edge 104 of the lock body base plate 1. When the engine hood is closed, the elastic ejector 5 rotates around the tension part 107. The elastic ejector 5 contacts the latch to provide resistance and play a buffering role. When the engine hood is opened, the elastic ejector 5 provides a popping force, so that the engine hood can be opened instantly, preventing jamming when the engine hood is opened. Due to the addition of the elastic ejector 5, the popping force of the engine hood lock body assembly is tested using a servo-controlled tensile testing machine. At a speed of 5 mm / min, from the fully open state to the fully locked state, the minimum force value during the process from the moment the secondary lock hook moves to the fully locked state is the popping force. The technical solution of the present invention can achieve a pop-out force with a wide range that is significantly improved compared to the prior art. The pop-out force can reach 50N-180N, which can meet the working conditions of engine hoods of different weights and types, such as engine hoods of 6KG-25KG. Therefore, it is applicable to a wider range of vehicle models and has greater compatibility.

[0027] Two sets of engine hood lock assemblies and latches were selected. In the first set, the engine hood lock assembly number was W0271817C5-01 and the latch number was W0271827C5-01. In the second set, the engine hood lock assembly number was W0271817C5-02 and the latch number was W0271827C5-02. Durability tests were then conducted on the two sets of engine hood lock assemblies and latches (see Tables 1, 2, and 3). The engine hood lock assemblies and latches were placed on a test bench with the engine hood lock assembly in the fully locked position. The sealing force was 300N±20N, and an energy was applied just enough to lock the engine hood lock assembly. The test frequency was 10 times / minute. One cycle consisted of the engine hood lock assembly locking, unlocking, and then returning to the locked state. After 5,000 cycles of engagement and disengagement of the engine hood lock assembly and latch, the operating force applied to the bottom of the pawl after the test of this invention does not exceed 20% of the original force, indicating good durability.

[0028] Table 1

[0029] Table 2

[0030] Table 3

[0031] like Figures 1-9 As shown, the ratchet 3 has a follower part 301, a first abutting part 302 and a second abutting part 303, and the pawl 4 has a first stop part 401 and a second stop part 402. A receiving section 403 is provided between the first stop part 401 and the second stop part 402. A pulling part 404 is provided at the bottom of the pawl 4, and a hook 4041 is provided at the end of the pulling part 404. The other end of the pawl return spring 7 abuts against the pulling part 404.

[0032] like Figures 1-9 As shown, the follower part 301, the first abutment part 302, and the second abutment part 303 are arranged in a clockwise sequence. An opening limiting edge 105 is vertically arranged on the upper left side of the lock body base plate 1. A ratchet limiting part 305 is provided on the side of the ratchet 3 facing the opening limiting edge 105. The ratchet limiting part 305 has a shaped groove that can significantly reduce vibration and noise. In the fully open state, the ratchet limiting part 305 abuts against the opening limiting edge 105, preventing the ratchet 3 from overtraveling.

[0033] like Figures 1-9 As shown, the lower right part of the pawl 4 has a pawl limiting part 405. When the pawl 4 returns to its original position, the pawl limiting part 405 abuts against the baffle 113 of the locking base plate 1 to form a limiting position.

[0034] Specifically, the engine hood closing process: When the engine hood falls, the latch on the engine hood contacts the elastic ejector 5 and the follower 301. Under the weight of the engine hood and the impact of free fall, the elastic ejector 5 and the ratchet 3 move with the hood latch. The ratchet 3 rotates around the first axis 8, and the elastic ejector 5 rotates downward. When the second abutment 303 on the ratchet 3 contacts the first stop 401 of the pawl 4, it will drive the pawl 4 to rotate around the second axis 9. When the second abutment 303 disengages from the first stop... After the moving part 401, the pawl 4 quickly returns to its original position under the action of the pawl return spring 7. At the same time, the ratchet 3 and the elastic ejector 5 continue to move downward under the action of the lock. When the second abutment part 303 on the ratchet 3 contacts the second stop part 402, it will drive the pawl 4 to rotate around the second axis 9 again. When the second abutment part 303 disengages from the second stop part 402 for a moment, the pawl 4 quickly resets under the action of the pawl return spring 7. The second abutment part 303 and the second stop part 402 abut against each other to form a semi-locked state.

[0035] As the latch continues to move downward, the first abutment 302 contacts the second stop 402, continuing to drive the pawl 4 to rotate. When the first abutment 302 disengages from the second stop 402 for a moment, the engine hood stops moving downward. Under the rebound action of the elastic ejector 5 and the ratchet return spring 6, the latch moves upward, and the first abutment 302 and the second stop 402 abut against each other to form a fully locked state, and the engine hood is safely closed.

[0036] Engine hood opening process: By operating the wrench in the cab, the pull cable connects to the hook 4041 of the pawl 4, and the second stop 402 releases the stop on the fully locked position of the ratchet 3, that is, releases the stop on the first stop 401. Under the action of the ratchet return spring 6 and the elastic ejector 5, the first stop 401 enters the receiving section 403. When the operating wrench is released, the pawl 4 returns to its original position, and the first stop 401 abuts against the first abutment 302 to form a semi-open state. In the cab, the wrench is operated for the second time, and the cable connects to the hook 4041. The first stop 401 of the pawl 4 releases its stop on the first abutment 302. Under the action of the ratchet return spring 6 and the elastic ejector 5, the ratchet 3 continues to rotate, and the second stop 402 enters the receiving section 403. After the wrench is released, under the action of the ratchet return spring 6, the ratchet limit part 305 of the ratchet 3 abuts against the opening limit edge 105, and the ratchet 3 completes its reset. Under the action of the ratchet return spring 7, the ratchet limit part 405 of the pawl 4 abuts against the baffle 113 of the locking base plate 1 to form a limit. The elastic ejector 5 resets, and the engine hood lock assembly is in the fully open state. The entire process involves opening the wrench twice in the cab to release the engine hood lock.

[0037] The ratchet return spring 6, the pawl return spring 7, and the elastic ejector 5 are torsion springs. One end of the elastic ejector 5 extends to the left and is located between the lock body base plate 1 and the cover plate 2.

[0038] like Figures 1-9 As shown, the lock body base plate 1 has an irregularly shaped protruding rib 106 on the side facing the cover plate 2. Furthermore, the protruding rib 106 has an arc segment 1061 arranged along the rotation direction of the first abutment portion 302 and the second abutment portion 303, and a curved segment 1062 intersecting the arc segment 1061. One end of the curved segment 1062 extends toward the first hole 102, reducing the large-area friction of the ratchet 3 during movement, and controlling the axial movement clearance of the ratchet 3.

[0039] like Figures 1-9 As shown, the cover plate 2 has a recessed surface 208 on the side opposite to the lock body base plate 1, and the pawl return spring 7 abuts against the recessed surface 208, which facilitates the installation and removal of the pawl return spring 7.

[0040] like Figures 1-9 As shown, the cover plate 2 is provided with a slot 204 that passes through it along the axial direction, and the limiting corner edge 104 is inserted into the slot 204. The limiting corner edge 104 can not only limit the ejection elastic element, but also engage with the cover plate 2 to limit the cover plate 2.

[0041] like Figures 1-9 As shown, the lock body base plate 1 is provided with a switch sub-assembly 10, which has a micro switch 1001 located below the ratchet 3. The bottom of the ratchet 3 is provided with an arc-shaped micro-movement protrusion 306. The micro-movement protrusion 306 cooperates with the micro-movement lever of the micro switch 1001. During the opening and closing of the engine hood, the ratchet 3 moves with the latch on the engine hood, and the lever of the micro switch 1001 contacts and separates from the micro-movement protrusion 306 of the ratchet 3, providing action feedback to indicate that the engine hood is open, attracting the driver's attention, avoiding unnecessary risks, and improving the user's sense of security.

[0042] like Figures 1-9 As shown, the micro switch 1001 is connected to the locking base plate via a fixing seat 11. The locking base plate has a first open slot 109 and a second open slot 110 extending axially through its lower left side. The fixing seat 11 has a mounting groove 1101, and the micro switch 1001 is installed in conjunction with the mounting groove 1101, with the micro switch 1001 located between the first open slot 109 and the second open slot 110. The fixing seat 11 has a first skirt 1102 and a second skirt 1103, which are respectively engaged in the first open slot 109 and the second open slot 1103. The opening slot 110 has a first skirt 1102 and a second skirt 1103 that abut against the side of the locking base plate 1 away from the cover plate 2. The first skirt 1102 has at least one round protrusion 1104 on the side facing the locking base plate 1. The locking base plate 1 has a locking point 111 that passes through it along the axial direction. The round protrusion 1104 is locked in the locking point 111. The second opening slot 110 has a notch 112. The second skirt 1103 may have a square protrusion 1105 that is locked in the notch 112. The micro switch 1001 is firmly connected to the locking base plate 1, and the installation is convenient and quick.

[0043] like Figures 1-9 As shown, the micro switch 1001 is electrically connected to a wire group, and a sleeve 1002 is sleeved on the wire group. A binding hook is provided at the lower left corner of the lock body base plate 1. The binding hook and the sleeve 1002 are bound together by a binding strap 1003, which can limit the movement of the sleeve 1002.

[0044] like Figures 1-9 As shown, the ratchet 3 is provided with a guide cylinder 307, the ratchet return spring 6 is sleeved on the guide cylinder 307, the first shaft 8 passes through the guide cylinder 307, the guide cylinder 307 can install the ratchet return spring 6, and the insertion into the third hole 202 can prevent the cover plate 2 from shaking and prevent the ratchet return spring 6 from moving upward and falling off due to rotational force.

[0045] like Figures 1-9 As shown, the lock body base plate 1 is detachably provided with a cover 12, and the cover plate 2 is located between the lock body base plate 1 and the cover 12, which serves to prevent dust and provide protection.

[0046] like Figures 1-9 As shown, a shock-absorbing layer 13 is provided on the outer periphery of the first abutment part 302 and the second abutment part 303. It can be plastic coated to play a role in shock absorption and noise reduction.

[0047] like Figures 1-9 As shown, with the side of the cover plate 2 away from the lock body base plate 1 as the front, the upper right part of the lock body base plate 1 is provided with a first locking edge 108. The first locking edge 108 and the second locking edge 206 abut and engage with each other. The second locking edge 206 can block the other end of the elastic ejector 5.

[0048] like Figures 1-9 As shown, with the side of the cover plate 2 facing away from the lock body base plate 1 as the front view, the lower left part of the cover plate 2 is provided with a lower limit edge 205. One end of the ratchet return spring 6 abuts against the lower limit edge 205. The ratchet 3 is provided with a protruding connecting block 304, and the connecting block 304 is provided with a groove to prevent the spring from dislodging. The other end of the ratchet return spring 6 is inserted into the groove on the connecting block 304. The upper left part of the lock body base plate 1 is provided with an ejection limit edge 207 for limiting the ejection of the elastic element.

[0049] The above embodiments are merely descriptions for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all implementations here, and any obvious variations or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. An engine hood lock assembly, comprising a lock body base plate, a cover plate, a ratchet and a pawl detachably connected to the lock body base plate and the cover plate, a pawl return spring disposed on the cover plate and connected at one end to the cover plate, wherein the ratchet is rotatably sleeved on a first shaft inserted into the lock body base plate and the cover plate, the pawl is rotatably sleeved on a second shaft inserted into the lock body base plate and the cover plate, the lock body base plate and the cover plate are respectively provided with a first notch and a second notch for the lock buckle to pass through, the lock body base plate is provided with a first hole and a second hole, and the cover plate is provided with a third hole and a fourth hole for mating installation, characterized in that: The first hole and the second hole are arranged symmetrically on both sides of the first notch on the bottom plate of the lock body. A ratchet return spring with one end connected to the cover plate is sleeved on the first shaft, and the other end of the ratchet return spring is connected to the ratchet.

2. The engine hood lock assembly according to claim 1, characterized in that: The upper space of the lock body base plate is provided with an elastic ejector. The elastic ejector is sleeved on the stretching part provided on the upper part of the lock body base plate. One end of the elastic ejector cooperates with the ejection limiting edge of the cover plate, and the other end cooperates with the limiting angle edge of the lock body base plate.

3. An engine hood lock assembly according to claim 1 or 2, characterized in that: The ratchet has a follower part, a first abutting part and a second abutting part, and the pawl has a first stop part and a second stop part. A receiving section is provided between the first stop part and the second stop part. A pulling part is provided at the bottom of the pawl, and a hook is provided at the end of the pulling part. The other end of the pawl return spring abuts against the pulling part.

4. The engine hood lock assembly according to claim 3, characterized in that: The follower part, the first abutment part and the second abutment part of the ratchet are arranged in clockwise order. An opening limit edge is vertically arranged on the upper left side of the lock body base plate. A ratchet limit part is arranged on the side of the ratchet facing the opening limit edge. In the fully open state, the ratchet limit part abuts against the opening limit edge.

5. The engine hood lock assembly according to claim 4, characterized in that: The lock body base plate has irregularly shaped protruding ribs on the side facing the cover plate.

6. The engine hood lock assembly according to claim 5, characterized in that: The rib has an arc segment arranged along the rotation direction of the first abutment portion and the second abutment portion, and a curved segment intersecting the arc segment, with one end of the curved segment extending toward the first hole.

7. The engine hood lock assembly according to claim 1, characterized in that: The cover plate has a recessed surface on the side opposite to the lock body base plate, and the pawl return spring abuts against the recessed surface.

8. An engine hood lock assembly according to claim 2, characterized in that: The cover plate is provided with a slot that passes through it along the axial direction, and the limiting angle edge is inserted into the slot.

9. An engine hood lock assembly according to claim 1, characterized in that: The lock body base plate is provided with a switch sub-assembly, which has a micro switch located below the ratchet. The bottom of the ratchet is provided with a micro-movement protrusion, which cooperates with the micro-movement lever of the micro switch.

10. An engine hood lock assembly according to claim 9, characterized in that: The micro switch is connected to the locking base plate via a fixing seat. The lower left part of the locking base plate is provided with a first open slot and a second open slot that pass through it axially. The fixing seat has a mounting slot. The micro switch is installed in the mounting slot and is located between the first open slot and the second open slot. The fixing seat has a first skirt and a second skirt. The first skirt and the second skirt are respectively engaged in the first open slot and the second open slot. The first skirt and the second skirt abut against the side of the locking base plate away from the cover plate. The first skirt is provided with at least one round protrusion. The locking base plate is provided with a locking point that passes through it axially. The round protrusion is engaged in the locking point.

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