A tailgate lock unlocking transmission device

Abstract

This utility model relates to the field of tailgate lock technology, specifically a tailgate lock unlocking transmission device, which can effectively prevent the transmission worm gear from reversing, ensure the normal reset of the opening rocker arm, and improve product reliability. It includes an opening rocker arm and a transmission worm gear connected to a motor. The opening rocker arm is connected to a rocker arm return torsion spring. The transmission worm gear is provided with a helical blade with a length less than one cycle. A notch exists in the longitudinal section of the transmission worm gear. The opening rocker arm is characterized by having an abutment block larger than the notch and abutting against the helical blade, and a locking block smaller than the notch. An opening for accommodating the helical blade is left between the locking block and the abutment block. An arc-shaped limiting block is provided on the transmission worm gear, and a cooperating elastic blocking block is provided next to the arc-shaped limiting block.

Description

Technical Field

[0001] This utility model relates to the field of tailgate lock technology, specifically a tailgate lock unlocking transmission device. Background Technology

[0002] Currently, electric vehicles and gasoline vehicles are the two most common and prevalent modes of transportation. Both types of vehicles have tailgates, and most are equipped with electric tailgate locks. These locks typically have a ratchet and pawl. When unlocking, the motor operates, using a transmission mechanism to rotate the pawl, disengaging it from the ratchet and thus unlocking the tailgate. Another unlocking method involves a motor driving a transmission worm gear. A helical blade on the worm gear pushes an opening rocker arm, which in turn rotates the pawl to unlock the tailgate. Examples include publications CN117090460A and CN220395428U. When the transmission worm gear rotates one revolution, allowing the opening rocker arm to reach the unlock position, a gap exists because the length of the helical blade is less than one helical cycle. The opening rocker arm is no longer obstructed by the helical blade and can pass through this gap to automatically reset. However, if the tailgate lock is subjected to vibration or other factors, causing the transmission worm gear to reverse, the gap position may change, preventing the opening rocker arm from smoothly passing through the gap and causing a jamming problem. The pawl also cannot reset, affecting subsequent normal use. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this utility model provides a tailgate lock unlocking transmission device, which can effectively prevent the transmission worm gear from reversing, ensure the normal reset of the opening rocker arm, and improve product reliability.

[0004] The technical solution is as follows: a tailgate lock unlocking transmission device includes an opening rocker arm and a transmission worm gear connected to a motor. The opening rocker arm is connected to a rocker arm return torsion spring. The transmission worm gear is provided with a helical blade with a length less than one cycle. The longitudinal section of the transmission worm gear has a notch. The opening rocker arm is provided with an abutment block with a size larger than the notch and abutting against the helical blade, and a stall block with a size smaller than the notch. An opening for accommodating the helical blade is left between the stall block and the abutment block. The transmission worm gear is provided with an arc-shaped limiting block, and a cooperating elastic blocking block is provided next to the arc-shaped limiting block.

[0005] A further feature is that the elastic blocking block is provided with an inclined surface and a blocking groove;

[0006] The elastic blocking block is disposed on the tailgate lock housing.

[0007] With this invention, after the transmission worm gear completes one revolution, the arc-shaped limiting block passes over the elastic blocking block and is blocked, preventing the transmission worm gear from reversing. At the same time, the stall block blocks the spiral blades to prevent them from continuing to rotate, ensuring that the transmission worm gear can rotate precisely into position, allowing the rocker arm to reset smoothly without jamming, thus improving product reliability. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model;

[0009] Figure 2 This is a schematic diagram of the notch on the helical blade;

[0010] Figure 3 A schematic diagram of the helical blades and arc-shaped limiting block on the transmission worm gear;

[0011] Figure 4 This is a schematic diagram of an elastic blocking block. Detailed Implementation

[0012] See Figures 1 to 4 As shown, a tailgate lock unlocking transmission device includes an opening rocker arm 1 and a transmission worm gear 3 connected to a motor 2. The opening rocker arm 1 is rotatably mounted on a rotating shaft 4 and connected to a rocker arm return torsion spring 5. The transmission worm gear 3 is provided with a helical blade 6 with a length less than one cycle. A notch 7 exists in the longitudinal section of the transmission worm gear 3. The opening rocker arm 1 is provided with an abutment block 1-1 with a size larger than the notch 7 and abutting against the helical blade 6, and a blocking block 1-2 with a size smaller than the notch 7. An opening for accommodating the helical blade 6 is left between the blocking block 1-2 and the abutment block 1-1. An arc-shaped limiting block 8 is provided on the transmission worm gear 3, and a matching elastic blocking block 9 is provided next to the arc-shaped limiting block 8. The elastic blocking block 9 is provided on the tailgate lock housing 10, and the elastic blocking block 9 is provided with an inclined surface and a blocking groove. 11 in the figure shows a gear connected to the transmission worm gear 3.

[0013] When unlocking, motor 2 drives the transmission worm gear 3 to rotate in one direction, such as... Figure 2 and Figure 3 As shown, the spiral blade 6 rotates clockwise, pushing the rocker arm 1 to open. Figure 1 As shown, rotating counterclockwise causes the arc-shaped limiting block 8 to rotate as well. When the spiral blade 6 pushes the opening arm 1 until it disengages, i.e., the transmission worm gear 3 rotates one revolution, and the opening arm 1 reaches its maximum opening position, unlocking is complete. The stalling blocks 1-2 then hold the spiral blade 6 in place to prevent the transmission worm gear 3 from continuing to rotate, and the motor 2 stops working. At this time, the arc-shaped limiting block 8 also rotates one revolution, passing over the inclined surface of the elastic blocking block 9 and locking into the blocking groove, effectively preventing the transmission worm gear 3 from rotating in the opposite direction. Figure 2 and Figure 3As shown, in the counterclockwise direction, the helical blade 8 is stabilized in this position. When the opening arm 1 is no longer subjected to the thrust of the helical blade 6, it moves as shown by the rocker arm return torsion spring 5. Figure 1 The clockwise rotation resets the blocking block 1-2, allowing it to pass smoothly through the gap, while the abutment block 1-1 is eventually blocked and resets to its initial position.

Claims

1. A tailgate lock-unlock transmission device, comprising an opening rocker arm and a transmission worm connected with a motor, the opening rocker arm is connected with a rocker arm return torsion spring, the transmission worm is provided with helical blades with a length less than one period, and there is a notch in the longitudinal section of the transmission worm, characterized in that, The opening rocker arm is provided with an abutment block larger than the notch and abutting against the helical blade and a stall block smaller than the notch. An opening for accommodating the helical blade is left between the stall block and the abutment block. An arc-shaped limiting block is provided on the transmission worm gear, and a matching elastic blocking block is provided next to the arc-shaped limiting block.

2. The tailgate lock unlocking transmission device according to claim 1, characterized in that, The elastic blocking block is provided with an inclined surface and a blocking groove.

3. The tailgate lock unlocking transmission device according to claim 1, characterized in that, The elastic blocking block is disposed on the tailgate lock housing.

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