A flatbed truck steering system
By combining the front and rear steering drive axles, hydraulic cylinders, and synchronizing rods, the problems of large turning radius and insufficient precision of flatbed trucks are solved, achieving flexible steering and high-precision control, and adapting to complex environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LUOYANG LONGPAI MASCH CO LTD
- Filing Date
- 2025-05-26
- Publication Date
- 2026-07-24
AI Technical Summary
Existing flatbed transport vehicles have a large turning radius, making it difficult to maneuver flexibly in narrow spaces, and they are also unable to meet the requirements in situations where high precision is required.
The design employs a combination of front and rear steering drive axles, front and rear steering cylinders, swing arm assemblies, and synchronizer rods to achieve synchronous or asynchronous steering of the front and rear wheel hubs. The steering radius and angle are controlled by the coordinated action of the front and rear steering cylinders.
It achieves a small turning radius and high steering precision, adapts to various complex environments, and improves transportation efficiency and safety.
Smart Images
Figure CN224546076U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of flatbed truck technology, specifically a flatbed truck steering system. Background Technology
[0002] Currently, the main steering methods for flatbed trucks are steering wheel type and steering axle type. Among them, the steering axle type generally uses front axle steering or rear axle steering. This traditional steering method has obvious defects. Its turning radius is relatively large. In some space-constrained operation scenarios, such as narrow workshop aisles and crowded freight yards, the large turning radius makes it difficult for flatbed trucks to turn flexibly. This not only reduces transportation efficiency, but may also lead to problems such as cargo collisions and vehicle damage due to the inability to turn smoothly. In addition, in some situations where high steering precision is required, the traditional steering method is also difficult to meet the requirements.
[0003] In order to overcome the shortcomings of existing technologies, it is urgent to develop a new type of flatbed truck steering system to achieve a smaller turning radius, improve the steering flexibility and work efficiency of flatbed trucks in complex environments, and at the same time have high steering accuracy to meet the needs of different working conditions. Utility Model Content
[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a flatbed truck steering system that solves the problems mentioned in the background section.
[0005] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a flatbed truck steering system, comprising a frame, with a front steering drive axle and a rear steering drive axle fixedly mounted at the front and rear ends of the frame, respectively. A swingable front wheel hub is mounted at both ends of the front steering drive axle. A front active bracket and a front driven bracket are provided between the front wheel hubs and the front steering drive axle. A front bracket synchronizing rod is installed between the front active bracket and the front driven bracket. A front steering cylinder for driving the front active bracket is mounted on the side of the frame closest to the front steering drive axle. A swingable rear wheel hub is mounted at both ends of the rear steering drive axle. A [missing information - likely a typo, should be inserted here] is provided between the rear wheel hubs and the rear steering drive axle. The rear active frame and the rear driven frame are connected by a rear frame synchronizing rod. A rear steering cylinder that drives the rear active frame to rotate is installed on the side of the frame near the rear steering drive axle. A swing arm assembly is installed in the middle of the frame. The swing arm assembly includes a bearing housing. A rotatable swing arm plate is installed below the bearing housing. Symmetrical front and rear indexing plates are fixedly installed at the lower ends of the swing arm plate, respectively. A front and rear hinge shaft are fixedly installed at the lower edges of the front and rear indexing plates, respectively. A front synchronizing rod is hinged between the front hinge shaft and the front driven frame, and a rear synchronizing rod is hinged between the rear hinge shaft and the rear driven frame.
[0006] Preferably, the frame is mainly composed of two vertical beams perpendicular to the steering drive axle and multiple horizontal beams parallel to the steering drive axle. The control arm assembly is mounted on the horizontal beam in the middle position, and the control arm assembly is at the same distance from the front steering drive axle and the rear steering drive axle.
[0007] Preferably, the front steering cylinder and the rear steering cylinder have the same shape and size, the front driving bracket, the front driven bracket, the rear driving bracket and the rear driven bracket have the same shape and size, and the front synchronizer rod and the rear synchronizer rod have the same shape and size.
[0008] Preferably, the extension rod of the steering cylinder is hinged to one end of the active bracket. When the steering cylinder is working, it pushes the active bracket to rotate. The active bracket pushes the driven bracket to rotate synchronously through the synchronizing rod. The wheel hub is moved by the active bracket and the driven bracket.
[0009] Preferably, when the extension rod of the steering cylinder is in the middle position, the wheel hub is parallel to the vehicle frame. When the extension rod of the steering cylinder continues to extend or retract from the middle position, the wheel hub and the vehicle frame form an angle, thereby achieving steering.
[0010] Preferably, the front indexing plate and the rear indexing plate are the same size, the radius of rotation of the indexing plate around the bearing seat is equal to the side length of the bracket, and the diameter of rotation of the hinge shaft on the indexing plate is equal to the side length of the bracket.
[0011] This utility model provides a flatbed truck steering system, which has the following beneficial effects: 1. The flatbed truck steering system, through the coordinated arrangement of the front steering drive axle, the rear steering drive axle, the front steering cylinder, and the rear steering cylinder, enables the flatbed truck steering system to achieve a small turning radius. Since both the front and rear wheel hubs are mounted on the steering drive axle and driven to rotate by the front and rear steering cylinders respectively, the front and rear wheels can turn simultaneously, thus achieving the effect of a small turning radius for the flatbed truck.
[0012] 2. The flatbed truck steering system, through the coordinated arrangement of the front steering cylinder, rear steering cylinder, swing arm assembly, and synchronizer, achieves high steering angle control precision and adaptability to various complex environments. Since the front and rear wheel hubs are respectively controlled by the front and rear steering cylinders, and their steering angles are simultaneously pulled synchronously by the synchronizer, and the swing arm assembly can change the synchronization ratio of the front and rear wheels, the front and rear wheels can either turn synchronously at different angles or asynchronously at the same angle. Therefore, the front and rear steering of the flatbed truck can be adjusted synchronously or asynchronously as needed to adapt to various complex environments. Attached Figure Description
[0013] Figure 1 This is a structural schematic diagram of the overall main view of this utility model; Figure 2 This is a structural schematic diagram of the overall bottom view of this utility model; Figure 3 This is a schematic diagram of the overall left view of this utility model; Figure 4 This is a schematic diagram of the overall swing arm assembly of this utility model; Figure 5 This is a schematic diagram of the swing arm assembly when the wheel hub rotates synchronously without angle restriction according to this utility model; Figure 6 This is a schematic diagram of the swing arm assembly when the hub restricts the angle and rotates synchronously according to this utility model; Figure 7 This is a schematic diagram of the swing arm assembly when the wheel hubs rotate synchronously but at different angles. Figure 8 This is a schematic diagram of the rocker arm assembly at one position when the wheel hubs of this utility model rotate asynchronously.
[0014] In the diagram: 1. Chassis; 2. Front steering drive axle; 3. Rear steering drive axle; 4. Front wheel hub; 5. Front active bracket; 6. Front driven bracket; 7. Front bracket synchronizer; 8. Front steering cylinder; 9. Rear wheel hub; 10. Rear active bracket; 11. Rear driven bracket; 12. Rear bracket synchronizer; 13. Rear steering cylinder; 14. Control arm assembly; 1401. Bearing housing; 1402. Control arm plate; 1403. Front indexing plate; 1404. Rear indexing plate; 1405. Front articulation shaft; 1406. Rear articulation shaft; 15. Front synchronizer; 16. Rear synchronizer. Detailed Implementation
[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0016] Example Please see Figures 1 to 8This utility model provides a technical solution: a flatbed truck steering system, including a frame 1, with a front steering drive axle 2 and a rear steering drive axle 3 fixedly mounted at the front and rear of the frame 1, respectively. A swingable front wheel hub 4 is mounted at both ends of the front steering drive axle 2. A front active bracket 5 and a front driven bracket 6 are arranged between the front wheel hub 4 and the front steering drive axle 2. A front bracket synchronizing rod 7 is installed between the front active bracket 5 and the front driven bracket 6. A front steering cylinder 8, which drives the front active bracket 5, is mounted on the side of the frame 1 closest to the front steering drive axle 2. A swingable rear wheel hub 9 is mounted at both ends of the rear steering drive axle 3. A rear active bracket 10 and a rear driven bracket 11 are arranged between the rear wheel hub 9 and the rear steering drive axle 3. A rear bracket synchronizing rod 12 is installed between the rear active bracket 10 and the rear driven bracket 11. A rear active bracket is mounted on the side of the frame 1 closest to the rear steering drive axle 3. A 10-rotating rear steering cylinder 13 is provided. A control arm assembly 14 is mounted in the middle of the frame 1. The control arm assembly 14 includes a bearing housing 1401. A rotatable control arm plate 1402 is mounted below the bearing housing 1401. Symmetrical front indexing plates 1403 and rear indexing plates 1404 are fixedly mounted on the lower ends of the control arm plate 1402, respectively. Front indexing plates 1403 and rear indexing plates 1404 are fixedly mounted on the lower edges of their respective lower edges. The front hinge shaft 1405 and the rear hinge shaft 1406 are hinged together, and the front hinge shaft 1405 and the front driven bracket 6 are hinged together by a front synchronizing rod 15. The rear hinge shaft 1406 and the rear driven bracket 11 are hinged together by a rear synchronizing rod 16. The front indexing plate 1403 and the rear indexing plate 1404 are the same size. The radius of rotation of the indexing plate around the bearing seat 1401 is equal to the side length of the bracket. The diameter of rotation of the hinge shaft on the indexing plate is equal to the side length of the bracket.
[0017] Specifically, the distance between the two front wheel hubs 4 is the same as the distance between the two rear wheel hubs 9. The front active bracket 5 and the rear active bracket 10 are mounted on a horizontal straight line. The front driven bracket 6 and the rear driven bracket 11 are mounted on a horizontal straight line. The front steering cylinder 8 and the rear steering cylinder 13 are controlled by two different oil circuits, but the components in the oil circuits are the same, so that the two cylinders can work asynchronously but the telescopic rods work at the same speed. The oil circuits are also equipped with pressure relief valves so that the steering cylinders can be pushed in the opposite direction.
[0018] Please see Figure 2 The frame 1 is mainly composed of two vertical beams perpendicular to the steering drive axle and multiple horizontal beams parallel to the steering drive axle. The swing arm assembly 14 is mounted on the horizontal beam in the middle position. The swing arm assembly 14 is at the same distance from the front steering drive axle 2 and the rear steering drive axle 3.
[0019] Specifically, the swing arm assembly 14 is located in the middle of the front driven bracket 6 and the rear driven bracket 11. The two ends of the swing arm assembly 14 are connected to the front driven bracket 6 and the rear driven bracket 11 respectively through two identical indexing plates and two identical synchronizing rods, so that the front driven bracket 6 and the rear driven bracket 11 can rotate synchronously. However, since the indexing plates can change the distance between the hinge points of the swing arm assembly 14 and the front driven bracket 6 and the rear driven bracket 11, the rotation angle of the front driven bracket 6 and the rear driven bracket 11 can be changed even though they rotate synchronously.
[0020] Please see Figures 1 to 8 The front steering cylinder 8 and the rear steering cylinder 13 have the same shape and size. The front active bracket 5, the front driven bracket 6, the rear active bracket 10, and the rear driven bracket 11 have the same shape and size. The front synchronizer 15 and the rear synchronizer 16 have the same shape and size. The extension rod of the steering cylinder is hinged to one end of the active bracket. When the steering cylinder is working, it pushes the active bracket to rotate. The active bracket pushes the driven bracket to rotate synchronously through the synchronizer. The wheel hub is moved by the active bracket and the driven bracket. When the extension rod of the steering cylinder is in the middle position, the wheel hub is parallel to the frame 1. When the extension rod of the steering cylinder continues to extend or retract from the middle position, the wheel hub and the frame 1 form an angle, thereby achieving steering.
[0021] Specifically, when the piston rods of the front steering cylinder 8 and the rear steering cylinder 13 extend and retract by the same distance, the steering angles of the front wheel hub 4 and the rear wheel hub 9 are also the same. When the state of the swing arm assembly 14 remains unchanged, the four wheel hubs can be turned synchronously through the connection of various identical components, but the steering angles can be the same or different. The difference in angle is achieved by changing the hinge point through the indexing plate.
[0022] The flatbed truck's steering system can operate in five modes: The first type: the front wheel hub 4 and the rear wheel hub 9 rotate synchronously without angle restriction. Specifically, the front indexing plate 1403 rotates the front hinge shaft 1405 to the outermost side, while the rear indexing plate 1404 rotates the rear hinge shaft 1406 to the innermost side. At this time, when the swing arm assembly 14 rotates, the rotation radius of the front hinge shaft 1405 and the rear hinge shaft 1406 is the same and larger than the corner of the bracket, so that the bracket can rotate at a large angle under the drive of the steering cylinder.
[0023] The second method involves the front hub 4 and the rear hub 9 rotating synchronously with a limited angle. Specifically, the front indexing plate 1403 rotates the front hinge shaft 1405 to the inside, while the rear indexing plate 1404 rotates the rear hinge shaft 1406 to the outside. At this time, when the swing arm assembly 14 rotates, the rotation radius of the front hinge shaft 1405 and the rear hinge shaft 1406 is the same but smaller than the corner of the frame, so that the frame is restricted by the swing arm assembly 14 and cannot rotate at a large angle.
[0024] The third type: the front wheel hub 4 and the rear wheel hub 9 rotate synchronously but at different angles. Specifically, the front indexing plate 1403 and the rear indexing plate 1404 rotate the front hinge shaft 1405 and the rear hinge shaft 1406 to different angles, so that the front hinge shaft 1405 and the rear hinge shaft 1406 have different radii of rotation on the swing arm plate 1402. That is, the hinge distance between the swing arm assembly 14 and the front driven bracket 6 is the same as the hinge distance between the swing arm assembly 14 and the rear driven bracket 11. This makes the front driven bracket 6 and the rear driven bracket 11 rotate synchronously but at different angles. Consequently, the front wheel hub 4 and the rear wheel hub 9 rotate synchronously but at different angles.
[0025] The fourth type: the angle of the front wheel hub 4 remains unchanged while the angle of the rear wheel hub 9 changes. At this time, the front steering cylinder 8 does not depressurize and does not work. Then, the rear steering cylinder 13 and the two index plates on the swing arm assembly 14 both work. By changing the state of the swing arm assembly 14, the angle of the rear wheel hub 9 can also be changed while the angle of the front wheel hub 4 remains unchanged.
[0026] Fifth method: The rear wheel hub 9 angle remains unchanged while the front wheel hub 4 angle changes. At this time, the rear steering cylinder 13 does not release pressure and does not work. Then, the front steering cylinder 8 and the two index plates on the control arm assembly 14 are both working. By changing the state of the control arm assembly 14, the front wheel hub 4 angle can also be changed while the rear wheel hub 9 angle remains unchanged.
[0027] In summary, this flatbed truck steering system, with both front and rear wheel hubs mounted on the steering drive axle and driven to rotate by two steering cylinders, allows for simultaneous steering of both front and rear wheels, resulting in a small turning radius. Since the front wheel hub 4 and rear wheel hub 9 are respectively controlled by the front steering cylinder 8 and the rear steering cylinder 13, and their steering angles are simultaneously pulled and rotated synchronously by the synchronizing rod, and the swing arm assembly 14 can change the synchronization ratio of the front and rear wheels, allowing them to turn synchronously at different angles or asynchronously at the same angle, the front and rear steering of the flatbed truck can be adjusted synchronously or asynchronously according to requirements to adapt to various complex environments.
[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A flatbed truck steering system, comprising a frame (1), characterized in that: The front steering drive axle (2) and the rear steering drive axle (3) are fixedly installed at the front and rear of the frame (1), respectively. A swingable front wheel hub (4) is installed at both ends of the front steering drive axle (2). A front active bracket (5) and a front driven bracket (6) are provided between the front wheel hub (4) and the front steering drive axle (2). A front bracket synchronizing rod (7) is installed between the front active bracket (5) and the front driven bracket (6). A front steering cylinder (8) that drives the front active bracket (5) to rotate is installed on the side of the frame (1) near the front steering drive axle (2). A swingable rear wheel hub (9) is installed at both ends of the rear steering drive axle (3). A rear active bracket (10) and a rear driven bracket (11) are provided between the rear wheel hub (9) and the rear steering drive axle (3). A rear bracket synchronizing rod (12) is installed between the rear active bracket (10) and the rear driven bracket (11). A rear steering cylinder (13) for driving the rear active bracket (10) to rotate is installed on the side of the frame (1) near the rear steering drive axle (3). A swing arm assembly (14) is installed in the middle of the frame (1). The swing arm assembly (14) includes a bearing housing (1401). A rotatable swing arm plate (1402) is installed below the bearing housing (1401). Symmetrical front indexing plates (1403) and rear indexing plates (1404) are fixedly installed at the lower ends of the swing arm plate (1402). A front hinge shaft (1405) and a rear hinge shaft (1406) are fixedly installed at the lower edges of the front indexing plate (1403) and the rear indexing plate (1404). A front synchronizing rod (15) is hinged between the front hinge shaft (1405) and the front driven bracket (6). A rear synchronizing rod (16) is hinged between the rear hinge shaft (1406) and the rear driven bracket (11).
2. The flatbed truck steering system according to claim 1, characterized in that: The frame (1) is mainly composed of two vertical beams perpendicular to the steering drive axle and multiple horizontal beams parallel to the steering drive axle. The swing arm assembly (14) is mounted on the horizontal beam in the middle position. The swing arm assembly (14) is at the same distance from the front steering drive axle (2) and the rear steering drive axle (3).
3. The flatbed truck steering system according to claim 1, characterized in that: The front steering cylinder (8) and the rear steering cylinder (13) have the same shape and size. The front active bracket (5), the front driven bracket (6), the rear active bracket (10) and the rear driven bracket (11) have the same shape and size. The front synchronizer (15) and the rear synchronizer (16) have the same shape and size.
4. The flatbed truck steering system according to claim 1, characterized in that: The extension rod of the steering cylinder is hinged to one end of the active bracket. When the steering cylinder is working, it pushes the active bracket to rotate. The active bracket pushes the driven bracket to rotate synchronously through the synchronizing rod. The wheel hub is moved by the active bracket and the driven bracket.
5. The flatbed truck steering system according to claim 1, characterized in that: When the extension rod of the steering cylinder is in the middle position, the wheel hub is parallel to the frame (1). When the extension rod of the steering cylinder continues to extend or retract from the middle position, the wheel hub and the frame (1) form an angle, thereby achieving steering.
6. The flatbed truck steering system according to claim 1, characterized in that: The front indexing plate (1403) and the rear indexing plate (1404) are the same size. The radius of rotation of the indexing plate around the bearing seat (1401) is equal to the side length of the bracket. The diameter of rotation of the hinge shaft on the indexing plate is equal to the side length of the bracket.