Automatic unlocking prevention structure of cover door actuator

Abstract

An automatic unlocking prevention structure of a cover door actuator comprises a shell, a bottom cover, a lock tongue and a lock pin, the lock tongue is in clearance fit in a guide cylinder arranged on the shell, a spring is arranged between the lock tongue and the bottom cover at the lower end, the lock pin is driven by a motor arranged in the shell, a nylon screw is matched with a rotating shaft of the motor, an inner threaded seat is arranged on the lock pin, and the inner threaded seat is connected with the nylon screw. The lock pin is in threaded fit with the nylon screw through an inner threaded seat, one side of the lock pin extends to form an L-shaped connecting arm, a lock pin head is arranged at the short arm end of the L-shaped connecting arm, and the upper end face of the lock pin head is an inclined face.

Description

Technical Field

[0001] This utility model relates to the field of door actuators, specifically to a structure for preventing automatic unlocking of door actuators. Background Technology

[0002] A door cover actuator is a device used to open or close a car's fuel filler or charging port cover. There are two types of actuation: the first is a reciprocating motion of the locking tongue along the circumference; the second is a continuous rotation of the locking tongue along the circumference. In existing technology, door cover actuators using the second actuation method, such as the invention patent "Door Cover Actuator for Car Energy Port" with publication number CN112096197A, allow manual manipulation of the upper part of the locking pin to unlock it in case of motor failure or abnormal power loss, thus achieving an emergency unlocking function. Therefore, the threaded fit between the screw and the locking pin cannot be too tight; that is, the threaded pair design cannot be self-locking. Both the screw and the locking pin are made of plastic with a helix angle of approximately 17° and a three-start thread. Simply moving the locking pin easily reverses the screw, achieving manual unlocking. However, this structure has the problem of automatic door unlocking. See [link to relevant documentation]. Figure 7 The motor provides power, driving the screw to rotate and move the locking pin 4, converting the motor's circular motion into the linear movement of the locking pin 4. The locking pin moves to the bottom of the latch 3, causing the locking pin head 42 of the locking pin 4 to abut against the locking stop 321 of the latch 3, limiting the displacement of the latch 3 and achieving locking. Then, the motor is de-energized and no longer provides power. When the door is pressed down from the outside, the latch 3 is subjected to downward pressure F. When the locking stop 321 of the latch 3 contacts the locking pin head 42 of the locking pin 4, the locking pin head 42 will tilt downward in the direction of the force. The component force F1 of the pressure F will continue to cause the locking pin 4 to retract, driving the screw to reverse. After multiple presses, the locking pin head 42 of the locking pin 4 will completely exit the area below the locking stop 321 of the latch 3, resulting in automatic unlocking. Summary of the Invention

[0003] To address the aforementioned problems, this utility model provides a structure to prevent automatic unlocking of a door actuator. By changing the upper surface of the locking pin head to a bevel, when the door is locked, the bevel cooperates with the locking part of the latch to limit the locking pin, thus solving the problem that the door will automatically unlock and open after being pressed multiple times.

[0004] The technical solution of this utility model is as follows: a structure for preventing automatic unlocking of a door actuator, including a housing, a bottom cover, a latch, and a locking pin. The latch is fitted with a guide tube in the housing. A spring is provided between the latch and the bottom cover at the lower end. The locking pin is driven by a motor in the housing. A nylon screw is fitted on the shaft of the motor. The locking pin is provided with an internal thread seat. The locking pin is threaded with the nylon screw through the internal thread seat. An "L"-shaped connecting arm extends from one side of the locking pin. A locking pin head is provided at the short end of the "L"-shaped connecting arm. The upper end face of the locking pin head is inclined.

[0005] Preferably, the inclination angle of the upper end face of the locking pin is greater than 3°.

[0006] Preferably, the inner wall of the guide cylinder is provided with a centrally symmetrical guide groove, the outer circular wall of the lock tongue is provided with a centrally symmetrical guide boss, the bottom cover is provided with an annular guide bevel, the annular guide bevel and the lower end of the guide groove form a locking channel and an unlocking channel for the guide boss, the lower end of the lock tongue is provided with an opening, the two sides of the opening are locking parts, the locking parts move to the upper end face of the locking pin head to form a lock.

[0007] Preferably, the annular guide bevel is provided with grease, and the bottom of the guide bevel is provided with an oil storage groove.

[0008] Preferably, the annular guide bevel includes a guide locking bevel and a guide unlocking bevel, and the guide locking bevel and the guide unlocking bevel respectively form a locking channel and an unlocking channel of the guide boss between the guide locking bevel and the lower end of the guide groove.

[0009] Preferably, the guide boss is an isosceles triangle or an isosceles trapezoid.

[0010] Preferably, the bottom cover is provided with a spring mounting post, and a spring is mounted on the spring mounting post.

[0011] The advantages of this utility model are:

[0012] 1. In this utility model, the upper end face of the locking pin head is set as an inclined surface. After the door is locked, if the door is pressed down further to move the latch downward, the locking part of the latch will abut against the inclined surface of the locking pin head. The locking part will limit the inclined surface and prevent the locking pin from exiting the set limit position, thereby preventing the door from unlocking automatically.

[0013] 2. This utility model features an oil reservoir at the bottom of the guide bevel. Grease is applied to the annular guide bevel. When the guide boss of the latch moves along the annular guide bevel, it squeezes and pushes the grease into the oil reservoir, allowing the grease to adhere and be stored there. When the guide boss of the latch moves back to the oil reservoir position, the grease adhering to the bottom of the guide boss will spread along the movement trajectory onto the annular guide bevel, maintaining long-term lubrication of the moving parts, improving product durability, increasing service life, and reducing the risk of jamming. Attached Figure Description

[0014] Figure 1 This is an exploded view of the cover door actuator of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the cover door actuator of this utility model;

[0016] Figure 3 This is a schematic diagram of the locking pin structure of this utility model;

[0017] Figure 4 A schematic diagram showing the positions of the latch and the locking pin when the door is locked and then pressed down again;

[0018] Figure 5 This is a schematic diagram of the locking tongue mechanism of this utility model;

[0019] Figure 6 This is a schematic diagram showing the movement of the guide boss of the locking tongue of this utility model;

[0020] Figure 7 This diagram illustrates the positions of the latch and the locking pin when the door is locked and then pressed down again, according to existing technology. Detailed Implementation

[0021] See Figures 1 to 6An anti-automatic unlocking structure for a door actuator includes a housing 1, a bottom cover 2, a latch 3, and a locking pin 4. The latch 3 is fitted with a guide cylinder 11 in the housing 1. The bottom cover 2 is provided with a spring mounting post 21, on which a spring 5 is mounted. The inner wall 111 of the guide cylinder 11 is provided with centrally symmetrical guide grooves 12. In this embodiment, two guide grooves 12 are provided. The outer circular wall of the latch 3 is provided with centrally symmetrical guide bosses 31. In this embodiment, two guide bosses 31 are provided. The positions of the two guide bosses 31 correspond to the positions of the two guide grooves 12. The guide bosses 31 are isosceles triangles or isosceles trapezoids. The purpose of this design is to allow the guide bosses 31 and the annular guide inclined side 22 to better form a guiding fit and reduce friction. The bottom cover 2 is provided with an annular guide bevel 22, which includes a locking guide bevel 221 and an unlocking guide bevel 222. The locking guide bevel 221 and the unlocking guide bevel 222 form a locking channel 223 and an unlocking channel 224 of the guide boss 31 between the lower end of the guide groove 12, respectively. Grease is provided on the annular guide bevel 22, and an oil storage groove 225 is provided at the bottom of the locking guide bevel 221. By setting the oil storage groove 225, it is ensured that the guide boss 31 of the lock tongue 3 can contact the grease stored in the oil storage groove every time it slides, maintaining its long-term lubrication, reducing friction, improving service life, and reducing the risk of jamming. An opening 32 is provided at the lower end of the lock tongue 3, and the two sides of the opening 32 are locking parts 321. The locking parts 321 move to the upper end face 421 of the locking pin head 42 of the locking pin 4 to form a lock. The locking pin 4 is driven by a motor 6 installed inside the housing 1. A nylon screw 7 is fitted onto the shaft of the motor 6. In this embodiment, both the locking pin and the nylon screw are made of plastic, with a helix angle of approximately 17°, enabling manual unlocking. The locking pin 4 is provided with an internal thread seat 40, through which the locking pin 4 is threadedly engaged with the nylon screw 7. An "L"-shaped connecting arm 41 extends from one side of the locking pin 4. A locking pin head 42 is provided at the short end of the "L"-shaped connecting arm 41, and the upper end face 421 of the locking pin head 42 is a bevel. The purpose of this design is that when the locking pin 4 is locked, the latch 3 also limits the locking pin 4. When the locking pin 4 is not unlocked, even if the door is subjected to violent pressure, the locking pin 4 will not disengage, avoiding the problem of the door automatically unlocking. The upper end face 421 of the locking pin head 42 has an inclination angle greater than 3°, and avoids interference between the locking pin 4 and the locking tongue 3. This ensures that when the locking tongue 3 is pressed down, the locking part 321 of the locking tongue 3 can limit the locking pin 4. Under normal circumstances, that is, when the locking tongue 3 is not under force, the locking pin 4 can be normally released and unlocked under the drive of the motor 6.

[0022] See Figure 6When the cover is opened, the guide boss 31 of the latch 3 is located at position c in the guide groove 12. When the cover is closed, the guide boss 31 of the latch 3 moves vertically along the guide groove 12, then rotates into the locking channel 223, reaching position d. After passing position d, the spring 5 returns to its original position, causing the latch 3 to move upward, thus allowing the guide boss 31 to reach position a to form the locking limit. If the cover is pressed further from the outside at this time, see... Figure 4 When the latch 3 is pressed down, the locking part 321 of the latch 3 abuts against the inclined surface of the upper end face of the locking pin head 423 of the locking pin 4. The locking part 321 limits the locking pin 4, preventing the locking pin 4 from exiting and avoiding automatic unlocking of the door. When normal unlocking is required, since there is no external force pressing the latch 3, the locking part 321 of the latch 3 will not contact the inclined surface of the upper end face of the locking pin head 423 of the locking pin. That is, there is a gap between them, ensuring that the locking pin 4 can exit normally under the drive of the motor 6, opening the door and allowing the guide boss 31 to reach the door. Figure 6 At position b in the guide groove 12, the guide boss 31 is positioned at position c in the guide groove 12 by unlocking channel 224 and spring 5, thereby opening the cover door.

[0023] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications made to the present utility model by those skilled in the art without departing from the spirit of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A structure for preventing automatic unlocking of a door actuator, comprising a housing (1), a bottom cover (2), a latch (3), and a locking pin (4), wherein the latch (3) is fitted with a guide tube (11) provided in the housing (1), a spring (5) is provided between the latch (3) and the bottom cover (2) at the lower end, and the locking pin (4) is driven by a motor (6) provided in the housing (1), characterized in that: A nylon screw (7) is fitted on the shaft of the motor (6). An internal thread seat (40) is provided on the locking pin (4). The locking pin (4) is threadedly engaged with the nylon screw (7) through the internal thread seat (40). An "L"-shaped connecting arm (41) extends from one side of the locking pin (4). A locking pin head (42) is provided at the short end of the "L"-shaped connecting arm (41). The upper end face (421) of the locking pin head (42) is a slope.

2. The anti-automatic unlocking structure for a door actuator according to claim 1, characterized in that: The upper end face (421) of the locking pin (42) has an inclination angle greater than 3°.

3. The anti-automatic unlocking structure for a door actuator according to claim 1, characterized in that: The inner wall (111) of the guide cylinder (11) is provided with a centrally symmetrical guide groove (12), the outer circular wall of the lock tongue (3) is provided with a centrally symmetrical guide boss (31), the bottom cover (2) is provided with an annular guide bevel (22), the annular guide bevel (22) and the lower end of the guide groove (12) form a locking channel (223) and an unlocking channel (224) of the guide boss (31), the lower end of the lock tongue (3) is provided with an opening (32), the two sides of the opening (32) are locking parts (321), the locking parts (321) move to the upper end face (421) of the locking pin head (42) of the locking pin (4) to form a lock.

4. The anti-automatic unlocking structure for a door actuator according to claim 3, characterized in that: The annular guide slope (22) includes a guide locking slope (221) and a guide unlocking slope (222). The guide locking slope (221) and the guide unlocking slope (222) form a locking channel (223) and an unlocking channel (224) of the guide boss (31) between the guide locking slope (221) and the lower end of the guide groove (12), respectively.

5. The anti-automatic unlocking structure for a door actuator according to claim 4, characterized in that: Grease is provided on the annular guide bevel (22), and an oil storage groove (225) is provided at the bottom of the guide upper locking bevel (221).

6. The anti-automatic unlocking structure for a door actuator according to claim 3, characterized in that: The guide boss (31) is an isosceles triangle or an isosceles trapezoid.

7. The anti-automatic unlocking structure for a door actuator according to claim 1, characterized in that: The bottom cover (2) is provided with a spring mounting post (21), and a spring (5) is installed on the spring mounting post (21).

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