Auxiliary device for self-attraction of a door lock

Abstract

The utility model relates to the technical field of automobile parts, specifically relates to a car door self-sucking lock auxiliary device. A car door self-sucking lock auxiliary device, including cable, first mobile part, second mobile part, the cable is connected drive motor, first mobile part and second mobile part all rotate and are fixed in fixed shell, still rotate and be fixed with third mobile part on the fixed shell, third mobile part is matched with second reset spring, third mobile part has second protruding, second protruding is located on the moving path of the lock catch of car door, third mobile part side is equipped with detection switch, when third mobile part is pushed by lock catch, detection switch triggers and controls drive motor pull cable, to make second mobile part rotate and make first protruding with lock catch contact. The utility model has the advantages of not easy to jam when using, longer service life, convenient maintenance, lower assembling maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to a self-closing auxiliary device for car doors. Background Technology

[0002] Some existing car doors do not have a self-closing locking function. Replacing the door lock directly may require damaging the original vehicle structure, and door locks with a self-closing locking function are more expensive.

[0003] Chinese Patent Application No. 202422268476.5 discloses an electric assisted self-closing car door lock device. Under the premise of using the original car door lock, by adding an auxiliary suction lock device with a drive mechanism and a handle signal mechanism, the auxiliary suction lock device can achieve the following: when the door is gently closed to a certain distance, the auxiliary suction lock device uses a sensor signal to drive the motor device to drive the auxiliary suction lock device to close the original car lock mechanism.

[0004] When the car door is closed, the door latch (lock pin / hook) pushes the bolt body to rotate, simultaneously causing the tension plate body, which engages with the bolt body, to rotate. At this time, the door latch is in a half-lock state. When the tension plate body rotates, it drives the first magnet to rotate, thereby triggering the first Hall sensor. Then, the motor starts to achieve the attraction function. The cable pulls the tension plate body to rotate it to its limit position, so that the bolt body, which engages with the tension plate body, pushes the door latch to move inward. The door latch pushes the door lock bolt on the door lock to move, and both the door latch and the door lock bolt reach the fully locked position. The third Hall sensor is triggered, the motor resets, and the force applied to the tension plate body is released. The tension plate body will move back to its original position under the action of the tension spring, and the bolt body rotates synchronously.

[0005] The above solution has the following drawbacks: it requires a large number of Hall sensors and needs to be triggered by magnets, which places high demands on assembly; when closing the door, the door latch directly applies force to the toothed latch body, which may deform after long-term use, and there may be jamming between the latch body and the tension plate body, resulting in a short service life for the auxiliary device. Utility Model Content

[0006] The purpose of this invention is to provide a door self-closing auxiliary device with lower production and assembly requirements and a longer service life.

[0007] To achieve the above objectives, this utility model employs a car door self-closing auxiliary device, comprising a pull cable, a first movable member connected to the pull cable, a second movable member engaging with the first movable member, and a first return spring for resetting the first and second movable members. The pull cable is connected to a drive motor. The second movable member has a first protrusion for contacting the door latch. Both the first and second movable members are rotatably fixed to a fixed housing. The fixed housing has a through groove that opens to one side for the latch to pass through. A third movable member is also rotatably fixed to the fixed housing. The third movable member is coupled with the second return spring. The third movable member has a second protrusion located on the movement path of the door latch. A detection switch is provided on the side of the third movable member. When the third movable member is pushed by the latch, the detection switch triggers and controls the drive motor to pull the pull cable, causing the second movable member to rotate and the first protrusion to contact the latch. After the latch moves to the fully locked position, the pull cable resets.

[0008] When the car door closes, the door latch first contacts the second protrusion of the third movable component, then pushes the third movable component to rotate, triggering the detection switch. The motor starts and pulls the cable, which pulls the first movable component to rotate, causing the second movable component, which meshes with the first movable component, to rotate. The first protrusion of the second movable component moves onto the movement trajectory of the latch and pushes the latch inward, thus moving the latch to the fully locked position and pushing the second protrusion of the third movable component to its limit position. Finally, the cable resets due to motor reset, motor stoppage, or other factors. The first and second movable components reset under the action of the first return spring. That is, after the car door is locked, the first and second movable components automatically return to their original positions. This reset action occurs after the car door is locked, ensuring that the toothed components and the cable can immediately return to their original positions after locking, preparing for the next operation.

[0009] When the door is opened, the door latch moves, releasing the restriction on the third movable part, which then resets under the action of the second return spring.

[0010] In this invention, the door latch does not directly impact the first and second movable parts. Instead, it pushes the third movable part, which triggers a detection switch. This, in turn, causes the first and second movable parts to rotate via a motor and cable, ultimately pushing the latch to the fully locked position. The meshing rotation of the first and second movable parts provides a smooth and controllable torque transmission, unaffected by instantaneous impacts, resulting in a longer service life. The third movable part, impacted by the door latch, is separately designed and can be made of more durable and wear-resistant materials. It is replaceable and, due to the absence of a toothed structure, has lower maintenance and replacement costs. Furthermore, the rotation of the third movable part after impact with the door latch directly triggers the detection switch, allowing for a faster motor response. The detection switch can be a microswitch.

[0011] Depending on the vehicle model and actual needs, the drive motor can be installed at the fixed housing or at other convenient locations away from the fixed housing.

[0012] Preferably, the drive motor has a built-in current detection unit, which is used to detect the operating current of the drive motor in real time. When the latch reaches the fully locked position, causing the drive motor to stall, the drive motor performs a reset action when the current detection unit detects that the stall current reaches a set value.

[0013] This invention does not use Hall sensors or other detection switches to detect whether a third moving part or other component has moved to the fully locked position and then send a signal to control the drive motor. Instead, it relies on the current detection built into the drive motor to achieve drive motor control. This results in more precise control, is not affected by other variables, enables the drive motor to respond faster, and improves the consistency of each cable pull and reset. It also reduces assembly costs, lowers the probability of failure, and improves the stability of product use.

[0014] Preferably, the middle part of the third movable member is rotatably fixed to the fixed shell, one end of the third movable member has the second protrusion at one of its opposite ends, and the other end of the third movable member is in contact with the trigger part of the detection switch.

[0015] The two ends of the third moving part face different functional areas, which optimizes the degree of freedom of assembly in a confined space and facilitates the assembly of the third moving part. The fulcrum of the third moving part is relatively centered, so that the force on both sides of the third moving part is opposite and the torque is balanced, resulting in less wear due to unidirectional off-center loading.

[0016] Preferably, the portion of the third movable member away from the second protrusion is fixed to one end of the second return spring, and the other end of the second return spring is fixed to the fixed shell.

[0017] The spring force acts on the long arm end away from the fulcrum, forming a reverse torque with the latch's thrust. This lever amplifies the leverage, enabling quick and reliable reset. The impact force of the latch on the second protrusion and the spring's reset force of the second reset spring form a couple, resulting in more balanced force distribution, less wear, and extended service life of the third moving part. The second reset spring also constrains the third moving part, preventing it from moving and reducing collisions between the third moving part and the door latch during vehicle operation.

[0018] Preferably, the fixed shell is provided with two opposing first limiting protrusions. The first limiting protrusions are close to the middle of the third movable member. When the third movable member is pushed to one side, it moves closer to one of the first limiting protrusions. When the third movable member is acted upon by the second return spring, it moves closer to the other first limiting protrusion.

[0019] The two first limiting protrusions rigidly define the working range (rotation range) of the third movable part, while limiting excessive rotation of the third movable part and preventing damage and deformation at the end of the third movable part and its own shaft.

[0020] Preferably, the fixed shell is provided with a second limiting protrusion for limiting the excessive rotation of the first movable member under the pulling action of the cable.

[0021] The second limiting protrusion is used to limit the end point of the first moving part being pulled by the cable, ensuring that it does not disengage from or jam with the meshing teeth of the second moving part; when the latch jams or foreign objects obstruct it, the second limiting protrusion forces the first moving part to stop rotating, which can cause the drive motor current to rise sharply, triggering the stall protection and stall current magnitude detection, making it easier to control the drive motor to reset, so that the cable tension is limited within the safe threshold and the cable is prevented from being pulled apart.

[0022] Preferably, the fixed housing is provided with a third limiting protrusion for limiting the excessive rotation of the second movable member under the action of the first return spring. When the second movable member contacts the third limiting protrusion, the first protrusion deviates from the through groove.

[0023] The third limit protrusion defines the reset waiting start point. When the second moving part is in the start point position, the first protrusion stops outside the latch path, ensuring that the first protrusion does not scratch the latch when the door is opened or closed.

[0024] Preferably, when the third movable member moves to its limit position under the action of the second return spring, the second protrusion has a contact surface located at the through groove, and the angle between the extending direction of the contact surface and the opening direction of the through groove is less than 10°. When the contact surface contacts the latch and the third movable member rotates, the angle formed between the contact surface and the opening direction of the through groove increases.

[0025] When the included angle is less than 10°, the contact surface is almost perpendicular to the direction of the latch movement. The latch impacts the contact surface with point / line contact, without lateral force, which facilitates the third moving part being pushed and the latch smoothly entering the passage groove. After rotation, the included angle increases, the angle between the contact surface and the direction of the latch movement decreases, and the normal force component of the latch on the contact surface increases significantly, which facilitates the opening of the car door.

[0026] This invention has the advantages of being less prone to jamming during use, having a longer service life, being easier to maintain, having lower assembly and maintenance costs, being more precise in control, having a faster drive motor response, and being more stable in use. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model.

[0028] Figure 2 This is another structural schematic diagram of the present invention. Detailed Implementation

[0029] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0030] Example 1 Depend on Figure 1 As shown, a car door self-closing lock auxiliary device includes a fixed housing 200. The fixed housing 200 has a passage groove 201 with a forward opening for the latch to pass through. A first movable member 1 and a second movable member 2 are rotatably fixed to the passage groove 201 on one side of the passage groove 201. The first movable member 1 and the second movable member 2 engage. The end of the first movable member 1 away from the second movable member 2 is connected to a cable 10. The cable 10 is connected to a drive motor 100, which is fixed to the fixed housing 200. A first return spring 11 is connected between the end of the first movable member 1 connected to the cable 10 and the fixed housing 200. The end of the second movable member 2 away from the first movable member 1 has a first protrusion 21 for contacting the car door latch. The cable 100 is covered with a protective tube, both ends of which are fixed to the fixed housing 200.

[0031] A third movable member 3 is provided on one side of the left and right sides of the groove 201. The middle part of the third movable member 3 is rotatably fixed to the fixed shell 201. One end of the third movable member 3 has a second protrusion 31 for contacting the door latch. The other end of the third movable member 3 is fitted with a detection switch 4, and this end is in contact with the contact part 41 of the detection switch 4. In this embodiment, the detection switch is a micro switch and is electrically connected to the drive motor 100. The part of the third movable member 3 away from the second protrusion 31 is fixed to one end of the second return spring 32, and the other end of the second return spring 32 is fixed to the fixed shell 200.

[0032] The second protrusion 31 is located on the movement path of the door latch and extends to the through groove 201. When the third movable member 3 is pushed by the latch, the detection switch 4 is triggered and controls the drive motor 100 to pull the cable 10, so that the second movable member 2 rotates and the first protrusion 21 moves to the through groove 201 and contacts the latch.

[0033] The drive motor 100 has a built-in current detection unit, which is used to detect the operating current of the drive motor in real time. When the latch reaches the fully locked position, causing the drive motor 100 to stall, and the current detection unit detects that the stall current reaches a set value, the drive motor 100 performs a reset action, and the cable 10 resets. In this embodiment, the current detection unit is a built-in structure of the existing motor used to detect the operating current and stall current.

[0034] The fixed housing 200 has two first limiting protrusions 33 arranged opposite each other. The first limiting protrusions 33 are close to the middle of the third movable member 3. When the third movable member 3 is pushed to one side, it moves closer to one of the first limiting protrusions. When the third movable member 3 is rotated to one side by the action of the second return spring 32, it moves closer to the other first limiting protrusion. The fixed housing 200 has a second limiting protrusion 12 for limiting the excessive rotation of the first movable member 1 under the pulling action of the cable 10. The fixed housing 200 has a third limiting protrusion 22 for limiting the excessive rotation of the second movable member 2 under the action of the first return spring 11. The third limiting protrusion 22 is located in front of the second limiting protrusion 12. When the second movable member 2 contacts the third limiting protrusion 22, the first protrusion 21 deviates from the through groove 201.

[0035] Depend on Figure 1 As shown, when the third movable member 3 moves to its limit position under the action of the second return spring 32, the second protrusion 31 has a contact surface 34 located at the through groove 201, and the angle between the extension direction of the contact surface 34 and the opening direction of the through groove 201 is less than 10°; when the contact surface 34 contacts the latch and causes the third movable member 3 to rotate, the angle formed between the contact surface 34 and the opening direction of the through groove 201 increases.

[0036] Example 2 Depend on Figure 2 As shown, the difference between this embodiment and embodiment 1 is only that: in this embodiment, the drive motor 100 is fixed on the base plate 300, the base plate 300 and the fixed shell 200 are independent components, and the cable 10 is longer. The cable 100 is covered with a protective tube, and the two ends of the protective tube are fixed to the base plate 300 and the fixed shell 200 respectively. The execution part with the first, second and third movable parts and the drive part with the drive motor 100 can be installed in different positions of the car according to actual needs.

[0037] When the door is closed, the car door moves, and the door latch first contacts the second protrusion 31 of the third movable member 3, which then pushes the third movable member 3 to rotate, triggering the detection switch 4. The drive motor 100 starts and pulls the cable 10, which pulls the first movable member 1 to rotate, causing the second movable member 2, which is engaged with the first movable member 1, to rotate. The first protrusion 21 of the second movable member 2 moves to the through slot and pushes the latch inward, thereby moving the latch to the fully locked position and pushing the second protrusion 31 of the third movable member 3 to the limit position.

[0038] At this time, the first movable part contacts the second limiting protrusion 12, and the cable 10 can no longer be pulled. The current detection unit of the drive motor 100 detects that the stall current has reached the set value, and the drive motor 100 performs a reset action. The cable 10 is reset, and the first movable part 1 and the second movable part 2 are reset under the action of the first reset spring 11, so that the first protrusion 21 is deviated from the through groove 201 and the door latch. The first movable part and the second movable part automatically return to their original positions under the action of the first reset spring. This reset action occurs after the door is locked, ensuring that the toothed parts can immediately return to their positions after locking, and prepare for the next operation.

[0039] When the door is opened, the door latch moves, releasing the restriction on the third movable part 3, and the third movable part 3 is reset under the action of the second return spring 32.

Claims

1. A door self-closing lock auxiliary device, comprising a pull cable, a first movable member connected to the pull cable, a second movable member engaging with the first movable member, and a first return spring for resetting the first and second movable members, wherein the pull cable is connected to a drive motor, and the second movable member has a first protrusion for contacting the door latch, characterized in that: The first and second movable components are both rotatably fixed to the fixed housing. The fixed housing has a through groove that opens to one side for the latch to pass through. A third movable component is also rotatably fixed to the fixed housing. The third movable component is equipped with a second return spring. The third movable component has a second protrusion located on the movement path of the door latch. A detection switch is provided on the side of the third movable component. When the third movable component is pushed by the latch, the detection switch is triggered and controls the drive motor to pull the cable, so that the second movable component rotates and the first protrusion contacts the latch. After the latch moves to the fully locked position, the cable returns to its original position.

2. The door self-closing auxiliary device according to claim 1, characterized in that: The drive motor has a built-in current detection unit, which is used to detect the operating current of the drive motor in real time. When the latch reaches the fully locked position, causing the drive motor to stall, the drive motor will perform a reset action when the current detection unit detects that the stall current has reached a set value.

3. The door self-closing auxiliary device according to claim 1, characterized in that: The middle part of the third movable member is rotatably fixed to the fixed shell, one end of the third movable member has the second protrusion at one of its opposite ends, and the other end of the third movable member is in contact with the trigger part of the detection switch.

4. The door self-closing auxiliary device according to claim 3, characterized in that: The portion of the third movable member away from the second protrusion is fixed to one end of the second return spring, and the other end of the second return spring is fixed to the fixed shell.

5. The door self-closing auxiliary device according to claim 1 or 3, characterized in that: The fixed shell is provided with two opposing first limiting protrusions. The first limiting protrusions are close to the middle of the third movable member. When the third movable member is pushed to one side, it moves closer to one of the first limiting protrusions. When the third movable member is pushed to one side by the second return spring, it moves closer to the other first limiting protrusion.

6. The door self-closing auxiliary device according to claim 1, characterized in that: The fixed shell is provided with a second limiting protrusion for limiting the excessive rotation of the first movable member under the pulling action of the cable.

7. The door self-closing auxiliary device according to claim 6, characterized in that: The fixed shell is provided with a third limiting protrusion for limiting the excessive rotation of the second movable member under the action of the first return spring. When the second movable member contacts the third limiting protrusion, the first protrusion deviates from the through groove.

8. The door self-closing auxiliary device according to claim 1, characterized in that: When the third movable member moves to its limit position under the action of the second return spring, the second protrusion has a contact surface located at the through groove. The angle between the extension direction of the contact surface and the opening direction of the through groove is less than 10°. When the contact surface contacts the latch and the third movable member rotates, the angle formed between the contact surface and the opening direction of the through groove increases.

Images