A door locking mechanism

Abstract

This utility model belongs to the field of tailgate locking technology. Specifically, it relates to a tailgate locking mechanism. The tailgate locking mechanism includes a tailgate mounted on a vehicle body. A locking structure is provided on the vehicle body, and the locking structure is connected to an actuating structure. When the tailgate needs to be locked, a hydraulic cylinder is activated, a hydraulic rod extends, and a guide rod and a sliding plate on a first connecting plate move with the hydraulic rod. A four-jaw turntable and a pin move, and the pin gradually approaches the pin hole. When the guide rod slides to the end of the guide groove, the pin is fully inserted into the pin hole, and the tailgate is locked. Through the coordinated action of the pin, the four-jaw turntable, and the hydraulic cylinder, the tailgate can be locked. By using four pins to secure the door, it is ensured that the tailgate is subjected to force from all four sides, resulting in a better sealing effect.

Description

Technical Field

[0001] This utility model belongs to the field of back door locking technology. Specifically, this utility model relates to a back door locking mechanism. Background Technology

[0002] In the design and use of garbage trucks, the locking performance of the tailgate directly affects operational safety and efficiency. Currently, the industry commonly uses pin-type or claw-hook-type locking structures to fix the tailgate, with the locking points mostly concentrated at the bottom of the tailgate. While this traditional design can achieve a certain degree of tailgate locking, for pin-type structures, with the locking point only at the bottom, the upper and sides of the tailgate lack effective restraint. During garbage loading and transportation, the tailgate is prone to lateral or longitudinal swaying due to the impact of garbage weight and vehicle bumps. Long-term use may lead to accelerated wear of the pin and pin hole, and even the risk of the pin falling off, affecting the reliability of locking. Similarly, the claw-hook structure, due to its single locking point, makes it difficult to evenly distribute the forces on the tailgate.

[0003] Chinese patent (publication number: 222137681U) discloses a self-locking tailgate and a vehicle; it includes at least one limiting member disposed between the tailgate and a trash can; when the tailgate is closed, the trash can can limit the tailgate by the limiting member to prevent the tailgate from opening; a vehicle includes the aforementioned self-locking tailgate. However, this self-locking tailgate is not stable and has poor sealing performance. Utility Model Content

[0004] This utility model is designed to solve the above-mentioned problems and aims to provide a rear door locking mechanism with stable structure and good sealing effect. To achieve the above objective, the technical solution adopted by this utility model is as follows: a rear door locking mechanism, including a rear door, the rear door being disposed on the vehicle body, the vehicle body being provided with a locking structure, and the locking structure being connected to an actuation structure.

[0005] The locking structure includes a four-claw turntable, which is connected to the tailgate pivot. Each of the four claws of the four-claw turntable is connected to a connecting rod, and the connecting rod is connected to a pin. The vehicle body is provided with a pin hole that cooperates with the pin.

[0006] The actuation structure includes a hydraulic cylinder, which is mounted on the vehicle body, and the hydraulic rod of the hydraulic cylinder is connected to a latch at the lower end of the tailgate.

[0007] The back door is provided with a guide seat, and the pin is located inside the guide seat.

[0008] The hydraulic rod of the oil cylinder is connected to a first connecting plate at its end. The first connecting plate is provided with a guide rod and a sliding plate. The sliding plate is connected to a pin. The back door is provided with a fixing plate. The fixing plate has a guide groove, and the guide rod is located in the guide groove.

[0009] The pin end is provided with a guide slope.

[0010] The tailgate is provided with a second connecting plate, which is hinged to the vehicle body.

[0011] A pad frame is provided on the back door, the four-claw turntable and the pin are located on the pad frame, and the guide seat is provided on the pad frame.

[0012] The guide seat includes an arched plate with bent plates connected to both ends. The bent plates are bolted to the pad frame, and the pin is located inside the arched plate.

[0013] Triangular reinforcing plates are provided at the corners of the pad frame.

[0014] The technical effect of this utility model is as follows: A tailgate locking mechanism includes a tailgate, which is mounted on the vehicle body. A locking structure is provided on the vehicle body, and the locking structure is connected to an actuation structure. When the tailgate needs to be locked, the hydraulic cylinder is activated, the hydraulic rod extends, and a guide rod and a sliding plate are provided on the first connecting plate to follow the movement of the hydraulic rod. The four-jaw turntable and the pin move, and the pin gradually approaches the pin hole. When the guide rod slides to the end of the guide groove, the pin is fully inserted into the pin hole, and the tailgate is locked. Through the coordinated action of the pin, the four-jaw turntable, and the hydraulic cylinder, the tailgate can be locked.

[0015] When the tailgate needs to be opened, the hydraulic rod retracts, and the guide rod and slide plate on the first connecting plate follow the movement of the hydraulic rod. The pin gradually moves away from the pin hole, and when the guide rod slides to the other end of the guide groove, the tailgate is unlocked. Attached Figure Description

[0016] This manual includes the following figures, which illustrate the following:

[0017] Figure 1 This is an overall structural diagram of a back door locking mechanism according to this utility model;

[0018] Figure 2 This utility model relates to a door locking mechanism. Figure 1 Enlarged view of point A in the middle.

[0019] The markings in the diagram are as follows: 1. Back door; 2. Locking structure; 201. Four-claw turntable; 202. Connecting rod; 203. Pin; 204. Pin hole; 3. Actuating structure; 301. Hydraulic cylinder; 4. Guide seat; 401. Arch plate; 402. Bending plate; 5. First connecting plate; 501. Guide rod; 502. Fixing plate; 503. Guide groove; 6. Guide slope; 7. Second connecting plate; 8. Pad frame; 9. Triangular reinforcing plate. Detailed Implementation

[0020] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0021] like Figures 1-2 As shown, a tailgate locking mechanism includes a tailgate 1, which is mounted on a vehicle body. A locking structure 2 is mounted on the vehicle body, and an actuation structure 3 is connected to the locking structure 2. The tailgate 1 is hinged to the vehicle body. The actuation structure 3 drives the locking structure 3 to move, thereby opening or locking the tailgate 1 on the vehicle body and ensuring the stability of the tailgate 1 during use.

[0022] The locking structure 2 includes a four-claw turntable 201, which is connected to the tailgate 1 via a pivot. Each of the four claws of the turntable 201 is connected to a connecting rod 202, and each connecting rod 202 is connected to a pin 203. The vehicle body has pin holes 204 that mate with the pins 203. The turntable 201 rotates, causing the four connecting rods 202 to move synchronously, thereby achieving the coordinated extension and retraction of the pins 203, ensuring the consistency of the multiple pin movements and improving locking stability. The turntable 201 is connected to the tailgate 1 via a pivot, allowing it to rotate flexibly around the pivot. The turntable 201 is connected to each of the four connecting rods 202 via a pivot, ensuring effective force transmission. Link 202 transmits force, transferring the rotational motion of the four-jaw turntable 201 to the extension and retraction motion of the latch 203. The four-jaw turntable 201 drives the latch 203 to move via link 202. The latch 203 locks and unlocks the tailgate 1 by inserting into or retracting from the latch hole 204 on the vehicle body. The simultaneous action of multiple latches 203 disperses the locking force, improves the stability of the tailgate after it is closed, and prevents the tailgate from shaking during vehicle operation.

[0023] The actuator 3 includes a hydraulic cylinder 301, which is mounted on the vehicle body. The hydraulic rod of the hydraulic cylinder 301 is connected to the latch 203 at the lower end of the tailgate 1. The hydraulic cylinder 301 serves as a power source, providing driving force through the extension and retraction of its hydraulic rod. This drives the latch 203 connected to it to move, which in turn drives the connecting rod 202 and the four-jaw turntable 201 to achieve synchronous movement of all the latches 203.

[0024] A guide seat 4 is provided on the back door 1, and the pin 203 is located inside the guide seat 4. The guide seat 4 guides and constrains the movement of the pin 203, ensuring that the pin 203 extends and retracts in a straight line, preventing the pin 203 from deviating or shaking during movement, ensuring that the pin 203 can be accurately inserted into the pin hole 204, and improving the stability and accuracy of the movement of the pin 203.

[0025] The hydraulic rod end of the oil cylinder 301 is connected to a first connecting plate 5. The first connecting plate 5 is provided with a guide rod 501 and a sliding plate 504. The sliding plate 504 is connected to the pin 203. The back door 1 is provided with a fixing plate 502. The fixing plate 502 has a guide groove 503. The guide rod 501 is located in the guide groove 503. The first connecting plate 5 is connected to the hydraulic rod of the connecting cylinder 301. A through groove is provided in the first connecting plate 5. The sliding plate 504 is located in the through groove and connected to the pin 203. The guide rod 501 passes through the groove and connects to the sliding plate 504. Both ends of the guide rod 501 extend out of the first connecting plate 5 and connect to the guide groove 503. When the back door 1 needs to be locked, the cylinder 301 is activated, the hydraulic rod extends, and the guide rod 501 and sliding plate 504 on the first connecting plate 5 move with the hydraulic rod. The pin 203 gradually approaches the pin hole 204. When the guide rod 501 slides to the end of the guide groove 503, the pin 203 is fully inserted into the pin hole 204, and the back door 1 is locked. When the back door 1 needs to be opened, the hydraulic rod retracts, and the guide rod 501 and sliding plate 504 on the first connecting plate 5 move with the hydraulic rod. The pin 203 gradually moves away from the pin hole 204. When the guide rod 501 slides to the other end of the guide groove 503, the back door 1 is unlocked. By securing the door with four latches 203, it is ensured that the tailgate 1 can be stressed from all four sides, resulting in a better door seal.

[0026] The end of the pin 203 is provided with a guide slope 6. The guide slope 6 plays a guiding role in the process of inserting the pin 203 into the pin hole 204, so that there is a slight positional deviation between the pin 203 and the pin hole 204, which can also make the pin 203 smoothly enter the pin hole 204, reduce the requirements for installation accuracy, and facilitate the closing and locking of the back door 1.

[0027] A second connecting plate 7 is provided on the tailgate 1, and the second connecting plate 7 is hinged to the vehicle body. The second connecting plate 7 connects the tailgate 1 to the vehicle body, provides a pivot point for the tailgate to rotate around the hinge axis, and completes the opening and closing actions. At the same time, it ensures the stability of the connection between the tailgate 1 and the vehicle body. One end of the second connecting plate 7 is fixedly connected to the tailgate 1, and the other end is hinged to the vehicle body.

[0028] A base frame 8 is provided on the back door 1. The four-claw turntable 201 and the pin 203 are located on the base frame 8, and the guide seat 4 is set on the base frame 8. The base frame 8 serves as an installation platform. The four-claw turntable 201, the pin 203, and the guide seat 4 are all set on the base frame 8. The base frame 8 enhances the structural strength of the back door 1 and at the same time prevents the back door from deforming due to the installation of the four-claw turntable 201, the pin 203, and the guide seat 4.

[0029] The guide seat 4 includes an arched plate 401, with bent plates 402 connected to both ends of the arched plate 401. The bent plates 402 are bolted to the pad frame 8, and the pin 203 is located inside the arched plate 401. The guide seat 4 is composed of an arched plate 401 and bent plates 402. The bent plates 402 are fixed to the pad frame 8 by bolts. The pin 203 is located inside the arched plate 401, and the shape of the arched plate 401 forms a wrapping constraint on the pin 203.

[0030] Triangular reinforcing plates 9 are installed at the corners of the pad frame 8. These plates primarily enhance the structural strength and rigidity of the corners of the pad frame 8. By being fixedly connected to the corners of the pad frame 8, the triangular reinforcing plates 9 disperse stress over a larger area, effectively resisting deformation caused by stress and preventing cracking, bending, or other damage at the corners of the pad frame 8.

[0031] The role and effect of the embodiments

[0032] When the back door 1 needs to be locked, the hydraulic cylinder 301 is activated, the hydraulic rod extends, and the guide rod 501 and the sliding plate 504 on the first connecting plate 5 move with the hydraulic rod, driving the pin 203 and the four-jaw turntable 201 to move. The pin 203 gradually moves closer to the pin hole 204. When the guide rod 501 slides to the end of the guide groove 503, the pin 203 is fully inserted into the pin hole 204, and the back door 1 is locked. When the back door 1 needs to be opened, the hydraulic rod retracts, and the guide rod 501 and the sliding plate 504 on the first connecting plate 5 move with the hydraulic rod. The pin 203 gradually moves away from the pin hole 204. When the guide rod 501 slides to the other end of the guide groove 503, the back door 1 is unlocked.

[0033] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A back door locking mechanism, characterized in that, Includes a tailgate (1), the tailgate (1) is installed on the vehicle body, the vehicle body is provided with a locking structure (2), and the locking structure (2) is connected to an actuation structure (3). The locking structure (2) includes a four-claw turntable (201), which is connected to the shaft of the tailgate (1). Each of the four claws of the four-claw turntable (201) is connected to a connecting rod (202), and the connecting rod (202) is connected to a pin (203). The vehicle body is provided with a pin hole (204) that cooperates with the pin (203).

2. The back door locking mechanism according to claim 1, characterized in that: The execution structure (3) includes a hydraulic cylinder (301), which is mounted on the vehicle body. The hydraulic cylinder (301) has a hydraulic rod connected to a pin (203) at the lower end of the tailgate (1). A guide seat (4) is provided on the tailgate (1), and the pin (203) is located inside the guide seat (4).

3. The back door locking mechanism according to claim 2, characterized in that: The hydraulic cylinder (301) has a first connecting plate (5) connected to the end of the hydraulic rod. The first connecting plate (5) is provided with a guide rod (501) and a sliding plate (504). The sliding plate (504) is connected to a pin (203). The back door (1) is provided with a fixing plate (502). The fixing plate (502) has a guide groove (503). The guide rod (501) is located in the guide groove (503).

4. The back door locking mechanism according to claim 1, characterized in that: The end of the pin (203) is provided with a guide slope (6).

5. The back door locking mechanism according to claim 1, characterized in that: The tailgate (1) is provided with a second connecting plate (7), which is hinged to the vehicle body.

6. The back door locking mechanism according to claim 2, characterized in that: The back door (1) is provided with a pad frame (8), the four-claw turntable (201) and the pin (203) are located on the pad frame (8), and the guide seat (4) is provided on the pad frame (8).

7. The back door locking mechanism according to claim 6, characterized in that: The guide seat (4) includes an arched plate (401), with bent plates (402) connected to both ends of the arched plate (401). The bent plates (402) are bolted to the pad frame (8), and the pin (203) is located inside the arched plate (401).

8. The back door locking mechanism according to claim 6, characterized in that: A triangular reinforcing plate (9) is provided at the corner of the pad frame (8).

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