Automatic tail hook structure
By designing an automatic tail hook structure, the tailgate's flipping motion drives a gear and rack mechanism to achieve automatic hooking and unhooking, solving the problem of manual operation required by existing tail hooks and improving ease of use.
Patent Information
- Application Number
- CN202421710001.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-07-18
AI Technical Summary
Existing automatic elastic tail hooks require manual hooking and unhooking, which is inconvenient to use.
An automatic tail hook structure was designed, including an active tail hook and a drive mechanism. The tail door flipping motion drives a gear and rack mechanism to achieve automatic hooking and unhooking of the tail hook.
It automates the operation of the tail hook, eliminating the need for manual hooking and unhooking, making it more convenient to use.
Smart Images
Figure CN223482466U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vehicle technology, and more specifically, to an automatic tail hook structure. Background Technology
[0002] To prevent the tailgate of a dump truck (self-dumping truck) from detaching during transportation, a tail hook is usually installed on the tailgate.
[0003] Patent CN215971257U discloses an automatic elastic tail hook, including a tail hook body installed in a carriage and a fixed shaft fixedly connected to the carriage. The tail hook body is rotatably installed on the outer wall of the fixed shaft. A first elastic element is provided between the tail hook body and the fixed shaft to drive the tail hook body to rotate in one direction. A limiting wheel is fixedly connected and coaxially arranged on the outer wall of the fixed shaft. A plurality of evenly arranged limiting grooves are provided around the limiting wheel. The tail hook body is provided with a limiting block movably connected and a second elastic element that presses the limiting block against the limiting groove. The limiting block is provided with a handle to drive it away from the limiting groove.
[0004] The aforementioned tail hooks require manual hooking and unhooking, making them inconvenient to use. Utility Model Content
[0005] The technical problem to be solved by this utility model is to address the above-mentioned shortcomings of the existing technology. The purpose of this utility model is to provide an easy-to-use automatic tail hook structure.
[0006] The technical solution of this utility model is: an automatic tail hook structure, including an active tail hook and a drive mechanism for driving the active tail hook to rotate. The drive mechanism includes a mounting frame for connecting to the carriage. A drive shaft connected to the active tail hook is rotatably disposed within the mounting frame. The drive shaft is provided with a gear. A rack that meshes with the gear is slidably disposed within the mounting frame. A limiting rod is provided at one end of the rack. A transmission head that moves according to the pressure of the tail door of the carriage is provided at one end of the limiting rod. A spring is sleeved on the limiting rod between the transmission head and the mounting frame. The two ends of the spring respectively press against the transmission head and the mounting frame.
[0007] As a further improvement, the mounting bracket includes a mounting cylinder for connecting the carriage, the drive shaft and gear are located inside the mounting cylinder, the drive shaft is rotatably connected to the mounting cylinder via a bearing, the bottom of the mounting cylinder is provided with a slide block, the slide block is provided with a slide rail that is slidably connected to the rack, and the bottom of the mounting cylinder is provided with a notch corresponding to the position of the rack.
[0008] Furthermore, a limiting part is provided at the connection between the transmission head and the limiting rod, and one end of the spring presses against the limiting part.
[0009] Furthermore, the mounting bracket also includes a mounting plate for connecting the mounting cylinder to the carriage. A baffle is provided on one side of the mounting plate, and the baffle has a first through hole for the transmission head to pass through. The diameter of the first through hole is smaller than the size of the limiting part. The mounting plate has a second through hole for the drive shaft to pass through.
[0010] Furthermore, the drive shaft is connected to the active tail hook via a spline mechanism.
[0011] Furthermore, a cover plate is provided on the side of the active tail hook away from the drive shaft. One end of the cover plate is locked to the end of the drive shaft by bolts, and the other end is locked to the active tail hook by bolts.
[0012] Furthermore, it also includes a driven tail hook, which is provided with a connecting mechanism for rotating with the carriage, and an active tail hook is provided with a connecting rod for driving the driven tail hook to rotate in linkage, with the upper and lower ends of the connecting rod respectively rotatably connected to the active tail hook and the driven tail hook.
[0013] Furthermore, the connecting rod includes an intermediate rod, with threaded sections at both ends of the intermediate rod. The threads of the two threaded sections are in opposite directions, and an adjusting sleeve is threaded to one end of each of the two threaded sections. A U-shaped lug is provided at one end of each of the two adjusting sleeves. One of the U-shaped lugs is rotatably connected to the driving tail hook via a pin, and the other U-shaped lug is rotatably connected to the driven tail hook via a pin.
[0014] Furthermore, the connecting mechanism includes a fixed shaft for connecting the carriage, and the driven tail hook is rotatably connected to the fixed shaft.
[0015] Furthermore, it includes two sets of active tail hooks and driven tail hooks, which are respectively installed on both sides of the car body.
[0016] Beneficial effects
[0017] Compared with the prior art, the advantages of this utility model are as follows:
[0018] This invention is installed at the rear of the truck bed. When the truck bed tilts downwards, the tailgate presses against the drive head, causing it to move backwards and compress the spring. This, in turn, drives the rack and pinion mechanism to rotate the active tail hook downwards, achieving automatic hooking. When the truck bed tilts upwards to unload, the tailgate does not press against the drive head. Under the elastic force of the compressed spring, the drive head moves forward, which in turn drives the rack and pinion mechanism to rotate the active tail hook upwards, achieving automatic unhooking. This invention eliminates the need for manual hooking and unhooking, making it convenient to use. Attached Figure Description
[0019] Figure 1This is a schematic diagram of the outer structure of the active tail hook upper hook in this utility model;
[0020] Figure 2 This is a schematic diagram of the inner structure of the active tail hook in this utility model;
[0021] Figure 3 This is a schematic diagram of the outer structure of the active tail hook disengagement mechanism in this utility model;
[0022] Figure 4 This is a schematic diagram of the inner structure of the active tail hook unhooking mechanism in this utility model;
[0023] Figure 5 for Figure 2 A cross-sectional view along the AA direction;
[0024] Figure 6 This is a schematic diagram of the mounting plate in this utility model;
[0025] Figure 7 This is a schematic diagram of the outer structure of the active tail hook and the driven tail hook in this utility model.
[0026] Figure 8 This is a schematic diagram of the inner structure of the active tail hook and the driven tail hook in this utility model.
[0027] Figure 9 This is a schematic diagram of the outer structure of the active tail hook and the driven tail hook disengagement in this utility model;
[0028] Figure 10 This is a schematic diagram of the inner structure of the active tail hook and the driven tail hook disengagement in this utility model;
[0029] Figure 11 This is a schematic diagram of the active tail hook in this utility model;
[0030] Figure 12 This is a schematic diagram of the driven tail hook in this utility model;
[0031] Figure 13 This is a schematic diagram of the connecting mechanism in this utility model.
[0032] The components are as follows: 1-Active tail hook, 2-Carriage, 3-Mounting bracket, 4-Drive shaft, 5-Gear, 6-Rack, 7-Limit rod, 8-Tail door, 9-Transmission head, 10-Spring, 11-Mounting cylinder, 12-Bearing, 13-Slide seat, 14-Slide rail, 15-Notch, 16-Limiting part, 17-Mounting base plate, 18-Baffle, 19-First through hole, 20-Second through hole, 21-Cover plate, 22-Bolt, 23-Driven tail hook, 24-Connecting mechanism, 25-Connecting rod, 26-Intermediate rod, 27-Threaded section, 28-Adjusting sleeve, 29-U-shaped ear plate, 30-Fixed shaft, 31-Hollowed structure, 32-Splined shaft, 33-Splined hole, 34-Hinge hole, 35-Waist hole, 36-Double nut, 37-Tail hook shaft, 38-Fixed shaft hole, 39-Keyway, 40-Fixed base. Detailed Implementation
[0033] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.
[0034] See Figures 1 to 13 An automatic tail hook structure includes an active tail hook 1 and a drive mechanism for driving the active tail hook 1 to rotate. The drive mechanism includes a mounting frame 3 for connecting to a carriage 2. A drive shaft 4 connected to the active tail hook 1 is rotatably mounted inside the mounting frame 3. The drive shaft 4 is equipped with a gear 5. A rack 6 that meshes with the gear 5 is slidably mounted inside the mounting frame 3. A limiting rod 7 is provided at one end of the rack 6. A transmission head 9 that moves according to the pressure of the tail door 8 of the carriage 2 is provided at one end of the limiting rod 7. A spring 10 is sleeved on the limiting rod 7 between the transmission head 9 and the mounting frame 3. The two ends of the spring 10 respectively press against the transmission head 9 and the mounting frame 3.
[0035] like Figure 1 , 2 As shown, the upper end of the carriage 2 is rotatably connected to the tailgate 8. When the carriage 2 is tilted up and down, the tailgate 8 generally remains in a vertical position. When the carriage 2 is tilted down to a horizontal position, the tailgate 8 presses against the transmission head 9, causing the transmission head 9 to move backward and compress the spring 10. This, in turn, drives the gear and rack mechanism composed of gear 5 and rack 6 to drive the active tail hook 1 to rotate downward, thereby automatically hooking the tail hook shaft 37 of the tailgate 8.
[0036] like Figure 3 , 4 As shown, when the carriage 2 tilts upward to the unloading position, the tailgate 8 does not press against the transmission head 9. Under the elastic force of the compression spring, the transmission head 9 moves forward, thereby driving the gear and rack mechanism to drive the active tail hook 1 to rotate upward, achieving automatic unhooking of the tail hook shaft 37 of the tailgate 8. The material is then unloaded from the gap between the carriage 2 and the tailgate 8. Therefore, this utility model does not require manual hooking and unhooking, making it convenient to use.
[0037] Specifically, the mounting bracket 3 includes a mounting cylinder 11 for connecting the carriage 2. A drive shaft 4 and a gear 5 are located inside the mounting cylinder 11. The drive shaft 4 is rotatably connected to the mounting cylinder 11 via a bearing 12. The diameter of the gear 5 is smaller than the diameter of the bearing 12. A slide block 13 is provided at the bottom of the mounting cylinder 11. A slide rail 14, which is slidably connected to the rack 6, is provided inside the slide block 13, limiting the reciprocating movement of the rack 6 within the slide rail 14. A notch 15, corresponding to the position of the rack 6, is provided at the bottom of the mounting cylinder 11 for the rack 6 to pass through. The drive shaft 4 has a keyway 39 for the gear 5 to be mounted on the drive shaft 4 via a key.
[0038] A limiting part 16 is provided at the connection between the transmission head 9 and the limiting rod 7, and one end of the spring 10 is pressed against the limiting part 16.
[0039] Furthermore, the mounting bracket 3 also includes a mounting plate 17 for connecting the mounting cylinder 11 to the carriage 2. A baffle 18 is provided on one side of the mounting plate 17, and the baffle 18 has a first through hole 19 for the transmission head 9 to pass through. The diameter of the first through hole 19 is smaller than the size of the limiting part 16, preventing the limiting part 16 from passing through the first through hole 19. The mounting plate 17 has a second through hole 20 for the drive shaft 4 to pass through. The active tail hook 1 and the drive mechanism can be installed on the mounting plate 17, allowing the tail hook structure to be directly welded or bolted to the carriage 2 as a single unit via the mounting plate 17.
[0040] In one embodiment, the drive shaft 4 and the active tail hook 1 are connected via a spline mechanism. For example... Figure 5 , Figure 11 As shown, one end of the drive shaft 4 is provided with a spline shaft 32, and the active tail hook 1 is provided with a spline hole 33. The spline shaft 32 is inserted into the spline hole 33 to drive the active tail hook 1 to rotate.
[0041] Alternatively, the spline shaft can be set in the active tail hook 1, while the spline hole can be set in the drive shaft 4.
[0042] The active tail hook 1 is provided with a cover plate 21 on the side away from the drive shaft 4. One end of the cover plate 21 is locked to the end of the drive shaft 4 by bolts 22, and the other end is locked to the active tail hook 1 by bolts 22. The double locking is achieved by locking with two bolts 22, which can improve the stability of the locking.
[0043] In one embodiment, the drive shaft 4 and the active tail hook 1 are directly locked together by a locking bolt.
[0044] In one embodiment, the tail hook structure further includes a driven tail hook 23. The driven tail hook 23 is provided with a connecting mechanism 24 for rotating with the carriage 2. The active tail hook 1 is provided with a connecting rod 25 for driving the driven tail hook 23 to rotate in linkage. The upper and lower ends of the connecting rod 25 are respectively rotatably connected to the active tail hook 1 and the driven tail hook 23, thereby realizing the automatic hooking or unhooking of the active tail hook 1 and the driven tail hook 23 in linkage.
[0045] Specifically, the connecting rod 25 includes an intermediate rod 26, with threaded sections 27 at both ends. The threads of the two threaded sections 27 are in opposite directions, and each threaded section 27 has an adjusting sleeve 28 threaded to one end. Each adjusting sleeve 28 has a U-shaped lug 29 at one end. One U-shaped lug 29 is rotatably connected to the driving tail hook 1 via a pin, that is, the U-shaped lug 29 is rotatably connected to the driving tail hook 1 via a pin passing through the hinge hole 34. The other U-shaped lug 29 is rotatably connected to the driven tail hook 23 via a pin, that is, the U-shaped lug 29 is rotatably connected to the driven tail hook 23 via a pin passing through the waist hole 35. Rotating the intermediate rod 26 allows the two adjusting sleeves 28 to be adjusted closer or further apart, making adjustment simple and convenient. After adjustment, the two sleeves 28 are locked in place by the double nuts 36 on the threaded sections 27.
[0046] The connecting mechanism 24 includes a fixed shaft 30 for connecting the carriage 2, a driven tail hook 23 rotatably connected to the fixed shaft 30, the driven tail hook 23 is provided with a fixed shaft hole 38 corresponding to the fixed shaft 30, such as the driven tail hook 23 being rotatably connected to the fixed shaft 30 through a bearing, and a fixed seat 40 is provided at the root of the fixed shaft 30, the fixed seat 40 being installed in the carriage 2 by welding or bolt connection.
[0047] Preferably, both the active tail hook 1 and the driven tail hook 23 are provided with a hollow structure 31, which can reduce the weight of the active tail hook 1 and the driven tail hook 23 without affecting the working strength, making the tail hook structure more convenient for transportation and installation.
[0048] Figure 1-Figure 4 , Figures 7-10 The automatic tail hook mechanism is shown installed on one side of the carriage 2. In practical applications, the automatic tail hook mechanism is generally installed on both sides of the carriage 2 because there are tail hook shafts 37 on both sides of the tailgate 8.
[0049] That is, it includes two sets of active tail hooks 1 and driven tail hooks 23 (a total of 4 tail hooks). The two sets of active tail hooks 1 and driven tail hooks 23 are respectively installed on both sides of the carriage 2, and are used to hook or unhook the 4 tail hook shafts 37 on both sides of the tail door 8.
[0050] When this automatic tail hook mechanism has only one active tail hook 1, active tail hooks 1 are installed on both sides of the carriage 2, which is suitable for carriages with smaller tonnage.
[0051] When the automatic tail hook mechanism consists of an active tail hook 1 and a driven tail hook 23 forming a linkage mechanism, the active tail hook 1 and the driven tail hook 23 are installed on both sides of the carriage 2 respectively, which is suitable for carriages with larger tonnage.
[0052] The above are merely preferred embodiments of this utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these will not affect the implementation effect of this utility model or the practicality of the patent.
Claims
1. An automatic tail hook structure, characterized in that, The device includes an active tail hook (1) and a drive mechanism for driving the active tail hook (1) to rotate. The drive mechanism includes a mounting bracket (3) for connecting the carriage (2). A drive shaft (4) for connecting the active tail hook (1) is rotatably provided in the mounting bracket (3). The drive shaft (4) is provided with a gear (5). A rack (6) that meshes with the gear (5) is slidably provided in the mounting bracket (3). A limiting rod (7) is provided at one end of the rack (6). A transmission head (9) is provided at one end of the limiting rod (7) to move according to the pressure of the tail door (8) of the carriage (2). A spring (10) is sleeved on the limiting rod (7) between the transmission head (9) and the mounting bracket (3). The two ends of the spring (10) are respectively pressed against the transmission head (9) and the mounting bracket (3).
2. The automatic tail hook structure according to claim 1, characterized in that, The mounting bracket (3) includes a mounting cylinder (11) for connecting the carriage (2). The drive shaft (4) and gear (5) are located inside the mounting cylinder (11). The drive shaft (4) is rotatably connected to the mounting cylinder (11) through a bearing (12). The bottom of the mounting cylinder (11) is provided with a slide block (13). The slide block (13) is provided with a slide rail (14) that is slidably connected to the rack (6). The bottom of the mounting cylinder (11) is provided with a notch (15) corresponding to the position of the rack (6).
3. The automatic tail hook structure according to claim 2, characterized in that, A limiting part (16) is provided at the connection between the transmission head (9) and the limiting rod (7), and one end of the spring (10) presses against the limiting part (16).
4. The automatic tail hook structure according to claim 3, characterized in that, The mounting bracket (3) further includes a mounting base plate (17) for connecting the mounting cylinder (11) to the carriage (2). A baffle (18) is provided on one side of the mounting base plate (17). The baffle (18) is provided with a first through hole (19) for the transmission head (9) to pass through. The diameter of the first through hole (19) is smaller than the size of the limiting part (16). The mounting base plate (17) is provided with a second through hole (20) for the drive shaft (4) to pass through.
5. The automatic tail hook structure according to claim 1, characterized in that, The drive shaft (4) is connected to the active tail hook (1) via a spline mechanism.
6. The automatic tail hook structure according to claim 5, characterized in that, The active tail hook (1) is provided with a cover plate (21) on the side away from the drive shaft (4). One end of the cover plate (21) is locked to the end of the drive shaft (4) by bolts (22), and the other end is locked to the active tail hook (1) by bolts (22).
7. An automatic tail hook structure according to any one of claims 1-6, characterized in that, It also includes a driven tail hook (23), which is provided with a connecting mechanism (24) for rotating with the carriage (2). The active tail hook (1) is provided with a connecting rod (25) for driving the driven tail hook (23) to rotate in linkage. The upper and lower ends of the connecting rod (25) are respectively rotatably connected to the active tail hook (1) and the driven tail hook (23).
8. The automatic tail hook structure according to claim 7, characterized in that, The connecting rod (25) includes an intermediate rod (26), and the two ends of the intermediate rod (26) are respectively provided with threaded sections (27). The threads of the two threaded sections (27) are opposite in direction. One end of each of the two threaded sections (27) is threadedly connected to an adjusting sleeve (28). One end of each of the two adjusting sleeves (28) is provided with a U-shaped ear plate (29). One of the U-shaped ear plates (29) is rotatably connected to the active tail hook (1) through a pin, and the other U-shaped ear plate (29) is rotatably connected to the driven tail hook (23) through a pin.
9. An automatic tail hook structure according to claim 7, characterized in that, The connecting mechanism (24) includes a fixed shaft (30) for connecting the carriage (2), and the driven tail hook (23) is rotatably connected to the fixed shaft (30).
10. An automatic tail hook structure according to claim 7, characterized in that, It includes two sets of active tail hooks (1) and driven tail hooks (23), which are installed on both sides of the carriage (2).