Rear vehicle group steering mechanism of bridge type transport vehicle
By introducing a follow-up mechanical swing arm and hydraulic lines into the steering mechanism of the rear group of the bridge transport vehicle, compatible operation of follow-up steering and manual steering has been achieved, solving the problem of limited steering ratio adjustment range, improving operational convenience and adaptability, and enhancing transportation efficiency and safety.
Patent Information
- Application Number
- CN202423297803.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-12-31
AI Technical Summary
The existing steering mechanism of the rear hull of the bridge transport vehicle can only select one mode: follow-up steering or manual steering. The steering ratio adjustment range is limited, and it cannot be flexibly switched under different road conditions.
In the steering mechanism of the rear group of the bridge transport vehicle, a follow-up mechanical swing arm and hydraulic pipeline improvement are introduced. A three-way connector is used to replace the selector switch. Combined with the follow-up circuit switch and the manual circuit switch, a compatible operation mode of follow-up steering and manual steering is realized. The adjustment range is expanded by improving the hydraulic oil circuit connection.
It achieves compatibility between automatic steering and manual steering, expands the steering ratio adjustment range, improves operational convenience and adaptability, reduces the switching process when road conditions change, and improves transportation efficiency and safety.
Smart Images
Figure CN223520886U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to bridge type transport vehicle control technical field, specifically is bridge type transport vehicle rear vehicle group steering gear. BACKGROUND
[0002] Bridge type transport vehicle is widely used in the field of super high, super heavy large piece transportation, and has irreplaceable effect on reducing loading height and dispersing bridge load. When using bridge type transport vehicle to carry large equipment, the steering control modes of front and rear vehicle groups are different. The front vehicle group is usually traction steering (automatic control), which is driven by the forward direction of the tractor. The rear vehicle group usually has two steering control modes: follow-up steering (automatic control) and manual steering (manual control).
[0003] The basic principle of follow-up steering of the rear vehicle group is as follows: the front vehicle group is driven by the tractor, and the steering movement of the front vehicle group makes the longitudinal center line of the front vehicle group and the longitudinal center line of the bridge frame produce a turning angle, and then makes the longitudinal center line of the bridge frame and the longitudinal center line of the rear vehicle group produce a turning angle. The follow-up mechanism between the bridge frame and the rear vehicle group converts the turning angle between them into mechanical action or oil pressure power, which drives the steering mechanism of the rear vehicle group to realize the steering of the rear vehicle group. The action amplitude and transmission ratio of the follow-up steering of the rear vehicle group are related to the radius of the road bend, and related to the ratio of the length of the bridge frame and the length of the rear vehicle group. Manual steering of the rear vehicle group is to directly control the steering of the rear vehicle group through the hydraulic station.
[0004] The follow-up steering control circuit and the manual steering control circuit of the current bridge type transport vehicle rear vehicle group steering mechanism are connected through a selection switch, that is, only one of the two modes can be selected for steering control, either follow-up steering or manual steering. Generally, follow-up steering is used on good road sections, and manual steering is used on poor road sections, and the steering ratio adjustment range is limited. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a bridge type transport vehicle rear vehicle group steering mechanism, which expands the steering ratio adjustment range without increasing or decreasing hardware cost; and provides an operation mode compatible with manual and follow-up, which improves the convenience of operation.
[0006] The utility model discloses a technical scheme is: bridge type transport car rear car group steering mechanism, including follow -up mechanical swing arm, rear tower station steering swing arm, left follow -up steering oil cylinder, right follow -up steering oil cylinder, rear car group left steering oil cylinder, rear car group right steering oil cylinder and hydraulic pipeline, follow -up mechanical swing arm and rear tower station steering swing arm all are installed in the load distribution beam of rear car group, and the rear tower station steering swing arm is connected with follow -up mechanical swing arm through connecting rod, the piston rod end of left follow -up steering oil cylinder and right follow -up steering oil cylinder is connected to follow -up mechanical swing arm, and the cylinder body is installed in the load distribution beam of rear car group, and follow -up mechanical swing arm drives the piston rod of left follow -up steering oil cylinder and right follow -up steering oil cylinder and expands mutually exclusive motion, the piston rod end of rear car group left steering oil cylinder is connected to the rear car group first axle tire of left side, and the cylinder body is installed in the car body of rear car group, the piston rod end of rear car group right steering oil cylinder is connected to the rear car group first axle tire of right side, and the cylinder body is installed in the car body of rear car group,
[0007] Hydraulic pipeline includes left main pipeline, left follow -up branch pipe, left manual branch pipe, right main pipeline, right follow -up branch pipe and right manual branch pipe, left main pipeline is connected to one of rear car group steering oil cylinder, and right main pipeline is connected to another rear car group steering oil cylinder, one branch of left main pipeline is connected to one follow -up steering oil cylinder through left follow -up branch pipe, and another branch is connected to hydraulic station through left manual branch pipe, one branch of right main pipeline is connected to another follow -up steering oil cylinder through right follow -up branch pipe, and another branch is connected to hydraulic station through right manual branch pipe, and manual operation valve is arranged between left manual branch pipe and right manual branch pipe, left main pipeline, left follow -up branch pipe and left manual branch pipe are connected through tee joint, right main pipeline, right follow -up branch pipe and right manual branch pipe are connected through tee joint, follow -up circuit switch is arranged on left follow -up branch pipe and right follow -up branch pipe, and manual circuit switch is arranged on left manual branch pipe and right manual branch pipe.
[0008] Further, the left main pipeline is connected to the rodless cavity of the rear car group left steering oil cylinder, the right main pipeline is connected to the rodless cavity of the rear car group right steering oil cylinder, and the left follow-up branch pipe is connected to the rod cavity of the right follow-up steering oil cylinder. The right follow-up branch pipe is connected to the rod cavity of the left follow-up steering oil cylinder.
[0009] Further, the left main pipeline is connected to the rodless cavity of the rear car group left steering oil cylinder, the right main pipeline is connected to the rodless cavity of the rear car group right steering oil cylinder, and the left follow-up branch pipe is connected to the rod cavity of the right follow-up steering oil cylinder. The right follow-up branch pipe is connected to the rod cavity of the left follow-up steering oil cylinder.
[0010] Further, the follow-up mechanical swing arm is inverted T-shaped, comprising a horizontal arm and a vertical arm, the piston rod of the left follow-up steering oil cylinder is installed on the right side of the horizontal arm, and the piston rod of the right follow-up steering oil cylinder is installed on the left side of the horizontal arm. The joint of the horizontal arm and the vertical arm is rotatably installed on the load distribution beam of the rear car group.
[0011] Further, a plurality of connecting holes are arranged at intervals along the length direction of the vertical arm of the follow-up mechanical swing arm; the follow-up mechanical swing arm and the rear tower steering swing arm are connected through a connecting rod, one end of the connecting rod is connected to the rear tower steering swing arm, and the other end is detachably connected to the connecting hole.
[0012] The bridge transport vehicle rear vehicle group steering mechanism has the advantages that the hydraulic pipeline is improved, the boundary between follow-up steering and manual steering is broken, and the compatible operation mode of follow-up steering and manual steering is realized, that is, follow-up steering is used under normal circumstances, when special road sections need manual operation, follow-up steering is directly manually corrected, and no additional adjustment such as closing follow-up steering related valves, follow-up steering and manual steering switching is needed.
[0013] The proportion of adjustment depending on the mechanical connecting hole is expanded to multiple proportions of the combination of the mechanical connecting hole and the hydraulic proportion, and the range of follow-up adjustment is increased. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is a prior art schematic diagram;
[0015] Figure 2 It is a schematic diagram of the embodiment one of the utility model;
[0016] Figure 3 It is a schematic diagram of a follow-up mechanical swing arm;
[0017] Figure 4 It is a follow-up steering control schematic diagram of the embodiment one;
[0018] Figure 5 It is a manual steering control schematic diagram of the embodiment one;
[0019] Figure 6 It is a compatible steering control schematic diagram of the embodiment one;
[0020] Figure 7 It is a schematic diagram of the embodiment two of the utility model.
[0021] In the drawing, follow-up mechanical swing arm 1, cross arm 1A, vertical arm 1B, rear tower steering swing arm 2, left follow-up steering oil cylinder 3, right follow-up steering oil cylinder 4, rear vehicle group first axle tire 5, rear vehicle group left steering oil cylinder 6, rear vehicle group right steering oil cylinder 7, follow-up circuit switch 8, manual circuit switch 9, manual operation valve 10, hydraulic station 11, connecting hole 12, left main pipeline 13, left follow-up branch pipe 14, left manual branch pipe 15, right main pipeline 16, right follow-up branch pipe 17, right manual branch pipe 18, selection switch 19. DETAILED DESCRIPTION
[0022] The utility model will be further explained as follows in connection with the drawings and embodiments.
[0023] In the specification, the orientation or positional relationship indicated by the terms "counterclockwise", "clockwise", "left", "right", and the like is based on the orientation or positional relationship shown in the drawings. Figure 2 The orientation or positional relationship indicated by the terms "counterclockwise", "clockwise", "left", "right", and the like is based on the orientation or positional relationship shown in the drawings.
[0024] The conventional rear vehicle group steering mechanism of the bridge transport vehicle, as shown in the drawings, comprises a follow-up mechanical swing arm 1, a rear tower platform steering swing arm 2, a left follow-up steering oil cylinder 3, a right follow-up steering oil cylinder 4, a rear vehicle group left steering oil cylinder 6, a rear vehicle group right steering oil cylinder 7, and a hydraulic pipeline. Figure 1 The follow-up mechanical swing arm 1 and the rear tower platform steering swing arm 2 are both installed on the load distribution beam of the rear vehicle group, the rear tower platform steering swing arm 2 is connected to the follow-up mechanical swing arm 1 through a connecting rod, and when the rear tower platform steering swing arm 2 swings under the action of the front vehicle group, the follow-up mechanical swing arm 1 is driven to swing through the connecting rod mechanism.
[0025] The piston rod end of the left follow-up steering oil cylinder 3 and the right follow-up steering oil cylinder 4 is connected to the follow-up mechanical swing arm 1, and the cylinder body is installed on the load distribution beam of the rear vehicle group; the piston rod of the left follow-up steering oil cylinder 3 and the right follow-up steering oil cylinder 4 is driven to extend and retract by the follow-up mechanical swing arm 1. That is, when the follow-up mechanical swing arm 1 swings by a corresponding angle, the piston rod of one of the left follow-up steering oil cylinder 3 and the right follow-up steering oil cylinder 4 is extended, and the piston rod of the other follow-up steering oil cylinder is retracted. That is, the piston rod of the left follow-up steering oil cylinder 3 is extended, and the right follow-up steering oil cylinder 4 is retracted; the piston rod of the left follow-up steering oil cylinder 3 is retracted, and the right follow-up steering oil cylinder 4 is extended.
[0026] The piston rod end of the rear vehicle group left steering oil cylinder 6 is connected to the left rear vehicle group kingpin tire 5, and the cylinder body is installed on the vehicle body of the rear vehicle group; the piston rod end of the rear vehicle group right steering oil cylinder 7 is connected to the right rear vehicle group kingpin tire 5, and the cylinder body is installed on the vehicle body of the rear vehicle group.
[0027] The hydraulic pipeline comprises a left main pipeline 13, a left follow-up branch pipeline 14, a left manual branch pipeline 15, a right main pipeline 16, a right follow-up branch pipeline 17, and a right manual branch pipeline 18; the left main pipeline 13 is connected to the rodless cavity of the rear vehicle group left steering oil cylinder 6, and the right main pipeline 16 is connected to the rodless cavity of the rear vehicle group right steering oil cylinder 7.
[0028] The left main pipeline 13 has one branch connected to the rodless cavity of the left follow-up steering oil cylinder 3 through the left follow-up branch pipeline 14 and another branch connected to the hydraulic station 11 through the left manual branch pipeline 15; the right main pipeline 16 has one branch connected to the rodless cavity of the right follow-up steering oil cylinder 4 through the right follow-up branch pipeline 17 and another branch connected to the hydraulic station 11 through the right manual branch pipeline 18, and the manual operation valve 10 is arranged between the left manual branch pipeline 15 and the right manual branch pipeline 18.
[0029] During operation, the piston rods of the left follow-up steering oil cylinder 3 and the right follow-up steering oil cylinder 4 are extended and retracted, the hydraulic pipeline between the left follow-up steering oil cylinder 3 and the rear vehicle group left steering oil cylinder 6 is communicated, the piston rod of the rear vehicle group left steering oil cylinder 6 is extended and retracted, so that the rear vehicle group first axle tire 5 on the left side is steered, at the same time, the hydraulic pipeline between the right follow-up steering oil cylinder 4 and the rear vehicle group right steering oil cylinder 7 is communicated, the piston rod of the rear vehicle group right steering oil cylinder 7 is extended and retracted, so that the rear vehicle group first axle tire 5 on the right side is steered, and it should be noted that the piston rods of the rear vehicle group left steering oil cylinder 6 and the rear vehicle group right steering oil cylinder 7 are extended and retracted alternately and cannot be simultaneously extended or retracted. In this way, the follow-up steering loop is formed among the follow-up mechanical swing arm 1, the rear tower platform steering swing arm 2, the left follow-up steering oil cylinder 3, the right follow-up steering oil cylinder 4, the rear vehicle group left steering oil cylinder 6, the rear vehicle group right steering oil cylinder 7 and the connected hydraulic pipelines.
[0030] The manual operation valve 10 can control the piston rod of the rear vehicle group left steering oil cylinder 6 to be retracted while the piston rod of the rear vehicle group right steering oil cylinder 7 is extended, or the piston rod of the rear vehicle group left steering oil cylinder 6 to be extended while the piston rod of the rear vehicle group right steering oil cylinder 7 is retracted, so that the manual steering loop is formed among the rear vehicle group left steering oil cylinder 6, the rear vehicle group right steering oil cylinder 7, the hydraulic station 11, the manual operation valve 10 and the corresponding pipelines.
[0031] The left main pipeline 13, the left follow-up branch pipeline 14 and the left manual branch pipeline 15 are connected through the selection switch 19; the right main pipeline 16, the right follow-up branch pipeline 17 and the right manual branch pipeline 18 are also connected through the selection switch 19. That is, when the selection switch 19 connects the left main pipeline 13 and the left follow-up branch pipeline 14 and the right main pipeline 16 and the right follow-up branch pipeline 17, the follow-up steering control loop is connected and the manual steering control loop is disconnected, and follow-up steering control is performed; conversely, the manual steering control loop is connected and the follow-up steering control loop is disconnected, and manual steering control is performed.
[0032] The utility model discloses, Figure 2As shown, the conventional bridge transport truck rear car group steering mechanism is improved. First, the selection switch 19 is cancelled, and a three-way connector is used to replace the selection switch 19. In this way, the left main pipe 13, the left follow-up branch pipe 14 and the left manual branch pipe 15 are always connected, and the right main pipe 16, the right follow-up branch pipe 17 and the right manual branch pipe 18 are also always connected. Second, the follow-up loop switch 8 is arranged on the left follow-up branch pipe 14 and the right follow-up branch pipe 17, and the manual loop switch 9 is arranged on the left manual branch pipe 15 and the right manual branch pipe 18. In this way, as shown in Figure 4 when the manual loop switch 9 is closed and the follow-up loop switch 8 is opened, follow-up steering control is performed; as shown in Figure 5 when the manual loop switch 9 is opened and the follow-up loop switch 8 is closed, manual steering control is performed; as shown in Figure 6 when the manual loop switch 9 and the follow-up loop switch 8 are both opened, follow-up steering control can be performed, and manual steering control can also be performed. In this way, when a special section needs to be manually operated, the follow-up steering is directly manually corrected, and the adaptability is better.
[0033] In addition, the hydraulic oil circuit is also improved. The traditional hydraulic oil circuit is that the rodless cavity of the left follow-up steering oil cylinder 3 is connected with the rodless cavity of the rear car group left steering oil cylinder 6, and the rodless cavity of the right follow-up steering oil cylinder 4 is connected with the rodless cavity of the rear car group right steering oil cylinder 7. After improvement, there are two implementation forms as follows.
[0034] As shown in Figure 2 , the left main pipe 13 is connected to the rod cavity of the rear car group right steering oil cylinder 7, the right main pipe 16 is connected to the rod cavity of the rear car group left steering oil cylinder 6, the left follow-up branch pipe 14 is connected to the rodless cavity of the left follow-up steering oil cylinder 3, and the right follow-up branch pipe 17 is connected to the rodless cavity of the right follow-up steering oil cylinder 4.
[0035] As shown in Figure 7 , the left main pipe 13 is connected to the rodless cavity of the rear car group left steering oil cylinder 6, the right main pipe 16 is connected to the rodless cavity of the rear car group right steering oil cylinder 7, the left follow-up branch pipe 14 is connected to the rod cavity of the right follow-up steering oil cylinder 4, and the right follow-up branch pipe 17 is connected to the rod cavity of the left follow-up steering oil cylinder 3.
[0036] That is, the traditional oil circuit connection form of the rodless cavity to the rodless cavity is changed to the oil circuit connection form of the rodless cavity to the rod cavity, so that the hydraulic adjustment proportion is expanded.
[0037] The follow-up mechanical swing arm 1 disclosed in this embodiment is inverted T-shaped, including a horizontal arm 1A and a vertical arm 1B. The piston rod of the left follow-up steering cylinder 3 is installed on the right side of the horizontal arm 1A, and the piston rod of the right follow-up steering cylinder 4 is installed on the left side of the horizontal arm 1A. The joint of the horizontal arm 1A and the vertical arm 1B is rotatably mounted to the load-sharing beam of the rear vehicle assembly. Thus, when the follow-up mechanical swing arm 1 swings clockwise around the pivot axis that is rotatably connected to the load-sharing beam, the piston rod of the right follow-up steering cylinder 4 is pressed back into the cylinder by the right end of the horizontal arm 1A, while at the same time, the piston rod of the left follow-up steering cylinder 3 is pulled out of the cylinder by the left end of the horizontal arm 1A. The same principle applies when the follow-up mechanical swing arm 1 swings counterclockwise.
[0038] To increase the transmission ratio of the servo adjustment, such as Figure 3 As shown, multiple connecting holes 12 are spaced along the length of the vertical arm 1B of the follow-up mechanical swing arm 1. The rear tower steering swing arm 2 is connected to the follow-up mechanical swing arm 1 by a connecting rod. One end of the connecting rod is connected to the rear tower steering swing arm 2, and the other end is detachably connected to the connecting hole 12. When different connecting holes 12 are selected to connect the follow-up mechanical swing arm 1 and the rear tower steering swing arm 2, the swing amplitude of the follow-up mechanical swing arm 1 is different after the swing of the rear tower steering swing arm 2 is transmitted to the follow-up mechanical swing arm 1 through the connecting rod. This allows the steering amplitude of the first axle tire 5 of the rear train to better adapt to different road curve conditions and the needs of the train.
[0039] Because of the wider range of steering ratios, the same set of follow-up steering mechanisms can be used for the steering needs of various vehicle models, saving on equipment investment. Furthermore, the operation control method reduces the switching process between follow-up steering and manual steering, minimizing the need for stopping and switching during actual transportation. This ensures operator safety, reduces labor intensity, improves transportation efficiency, and alleviates traffic congestion caused by the transport of large items by bridge vehicles.
[0040] This utility model discloses a rear steering mechanism for a bridge-type transport vehicle, which expands the range of adaptive adjustment. The adjustment ratio has been expanded from solely relying on mechanical connection holes to a variety of ratios combining mechanical connection holes and hydraulic ratios. Improvements have been made to the hydraulic piping, breaking down the boundary between adaptive and manual steering and achieving a compatible operating mode for both. Under normal circumstances, adaptive steering is used; when encountering special road sections requiring manual operation, the adaptive steering can be directly corrected manually without the need for additional adjustments such as closing related valves or switching between adaptive and manual steering.
[0041] In the description of the present application, it should be noted that unless otherwise expressly specified and limited, the terms "mounting", "provided with", "connected" and the like should be interpreted broadly, for example, "connected" can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0042] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application.
Claims
1. A rear vehicle group steering mechanism of a bridge transport vehicle, comprising a follow-up mechanical swing arm (1), a rear tower platform steering swing arm (2), a left follow-up steering oil cylinder (3), a right follow-up steering oil cylinder (4), a rear vehicle group left steering oil cylinder (6), a rear vehicle group right steering oil cylinder (7), and a hydraulic pipeline; the follow-up mechanical swing arm (1) and the rear tower platform steering swing arm (2) are both installed on a load distribution beam of the rear vehicle group, and the rear tower platform steering swing arm (2) is connected with the follow-up mechanical swing arm (1) through a connecting rod; a piston rod end of the left follow-up steering oil cylinder (3) and the right follow-up steering oil cylinder (4) is connected with the follow-up mechanical swing arm (1), and a cylinder body is installed on the load distribution beam of the rear vehicle group; the piston rod of the left follow-up steering oil cylinder (3) and the right follow-up steering oil cylinder (4) is driven by the follow-up mechanical swing arm (1) to extend and retract in a mutual exclusion manner; a piston rod end of the rear vehicle group left steering oil cylinder (6) is connected with a left rear vehicle group first axle tire (5), and a cylinder body is installed on a vehicle body of the rear vehicle group; a piston rod end of the rear vehicle group right steering oil cylinder (7) is connected with a right rear vehicle group first axle tire (5), and a cylinder body is installed on the vehicle body of the rear vehicle group; the hydraulic pipeline comprises a left main pipeline (13), a left follow-up branch pipeline (14), a left manual branch pipeline (15), a right main pipeline (16), a right follow-up branch pipeline (17), and a right manual branch pipeline (18); and the left main pipeline (13) is connected to one of the rear vehicle group steering oil cylinders, and the right main pipeline (16) is connected to the other rear vehicle group steering oil cylinder; one branch of the left main pipeline (13) is connected to one of the follow-up steering oil cylinders through the left follow-up branch pipeline (14), and the other branch is connected to a hydraulic station (11) through the left manual branch pipeline (15); one branch of the right main pipeline (16) is connected to the other follow-up steering oil cylinder through the right follow-up branch pipeline (17), and the other branch is connected to the hydraulic station (11) through the right manual branch pipeline (18); a manual operation valve (10) is arranged between the left manual branch pipeline (15) and the right manual branch pipeline (18); the left main pipeline (13), the left follow-up branch pipeline (14), and the left manual branch pipeline (15) are connected through a three-way joint; the right main pipeline (16), the right follow-up branch pipeline (17), and the right manual branch pipeline (18) are connected through a three-way joint; a follow-up loop switch (8) is arranged on the left follow-up branch pipeline (14) and the right follow-up branch pipeline (17); and a manual loop switch (9) is arranged on the left manual branch pipeline (15) and the right manual branch pipeline (18). the left main pipeline (13) is connected to a rodless cavity of the rear vehicle group left steering oil cylinder (6), the right main pipeline (16) is connected to a rodless cavity of the rear vehicle group right steering oil cylinder (7), the left follow-up branch pipeline (14) is connected to a rod cavity of the right follow-up steering oil cylinder (4), and the right follow-up branch pipeline (17) is connected to a rod cavity of the left follow-up steering oil cylinder (3).
2. The bridge vehicle rear set steering mechanism of claim 1, wherein: 3. The bridge vehicle rear set steering mechanism of claim 1, wherein: The left main pipeline (13) is connected to the rod cavity of the right steering oil cylinder (7) of the rear vehicle group, the right main pipeline (16) is connected to the rod cavity of the left steering oil cylinder (6) of the rear vehicle group, and the left follow-up branch pipeline (14) is connected to the rodless cavity of the left follow-up steering oil cylinder (3); the right follow-up branch pipeline (17) is connected to the rodless cavity of the right follow-up steering oil cylinder (4).
4. A rear truck unit turning mechanism for a bridge vehicle as claimed in claim 1 or 2 or 3 wherein: The follow-up mechanical swing arm (1) is inverted T-shaped, comprising a horizontal arm (1A) and a vertical arm (1B), the piston rod of the left follow-up steering oil cylinder (3) is installed on the right side of the horizontal arm (1A), and the piston rod of the right follow-up steering oil cylinder (4) is installed on the left side of the horizontal arm (1A); the joint of the horizontal arm (1A) and the vertical arm (1B) is rotatably installed on the load distribution beam of the rear vehicle group.
5. The bridge vehicle rear set steering mechanism of claim 4, wherein: A plurality of connecting holes (12) are arranged on the vertical arm (1B) of the follow-up mechanical swing arm (1) at intervals along the length direction of the vertical arm (1B); the rear tower platform steering swing arm (2) and the follow-up mechanical swing arm (1) are connected through a connecting rod, one end of the connecting rod is connected to the rear tower platform steering swing arm (2), and the other end is detachably connected to the connecting hole (12).