Multi-axle commercial vehicle active steering system and multi-axle commercial vehicle

Abstract

The utility model relates to a multi-axle commercial vehicle active steering system and a multi-axle commercial vehicle, the multi-axle commercial vehicle active steering system comprises a steering angle sensor arranged on a steering column and an active steering controller arranged at the lower end of a vehicle seat, the steering angle sensor is connected with the active steering controller, and the active steering controller is in control connection with a proportional valve group. The proportional valve group is connected with the duplex steering pump and the second steering oil tank; a duplex steering pump is adopted as a steering power source, a main steering pump provides power for steering of a front axle, an auxiliary steering pump provides power for steering of a lifting shaft, installation is convenient and reliable, hydraulic force pushes a steering power-assisted cylinder on the lifting shaft to work, cost is low, reliability is high, meanwhile, arrangement is simple, universality is good, and active steering of heavy truck multi-axle vehicle types can be applied in batches.

Description

Technical Field

[0001] The utility model relates to the technical field of commercial vehicles, in particular to an active steering system for multi-axle commercial vehicles and a multi-axle commercial vehicle. Background Technique

[0002] At present, when heavy truck commercial vehicles are driving in urban areas and on winding road sections, affected by road conditions and the vehicle's own length, etc., the turning radius of the vehicle is relatively large, and it is difficult for the vehicle to turn and reverse. To reduce the turning radius of the vehicle, an active steering system is adopted for the last axle of the vehicle;

[0003] The first existing implementation method of the active steering system: The steering gear is used to control the front axle steering and the lift axle steering. The vehicle engine steering pump drives the steering hydraulic oil for the steering gear to achieve the front axle steering. At the same time, the engine steering pump transports a certain amount of steering hydraulic oil from the front end of the vehicle into the steering hydraulic cylinder of the last axle of the vehicle. Generally, the last axle of the vehicle is the lift axle, and the vehicle lift axle realizes active steering. This solution has low cost and high maturity, but has disadvantages such as complex layout, low control accuracy, and poor versatility. At the same time, when the lift axle is lifted and the vehicle's front axle steers, the lift axle also follows the steering;

[0004] The second existing implementation method of the active steering system: It consists of a rear axle steering power unit and a rear axle steering power cylinder. The vehicle collects the front axle corner information through the front axle corner sensor, and the corner sensor transmits the steering information to the active steering controller. The active steering controller controls the direction and speed of the wheel corner by controlling the rotation direction of the motor. This solution has high control accuracy and high maturity, but due to the high development cost, the product price is high and mass production cannot be achieved. Content of the Utility Model

[0005] The purpose of the utility model is to provide an active steering system for multi-axle commercial vehicles and a multi-axle commercial vehicle in view of the deficiencies of the prior art.

[0006] The utility model is implemented by adopting the following technical scheme:

[0007] An active steering system for multi-axle commercial vehicles includes a corner sensor arranged on the steering column and an active steering controller arranged at the lower end of the vehicle seat. The corner sensor is connected to the active steering controller,

[0008] The active steering controller is connected to the proportional valve group in a controlled manner, and the proportional valve group is connected to a double-connected steering pump and a second steering oil tank.

[0009] Further, the dual steering pump includes a main steering pump and a sub-steering pump connected in series. The main steering pump is connected to a first steering oil tank through a first oil inlet pipe, and the first steering oil tank is connected to a steering gear through a first oil return pipe. One end of the sub-steering pump is connected to a second steering oil tank through a second oil inlet pipe, the second steering oil tank is connected to a proportional valve group through a first steering oil pipe, and the other end of the sub-steering pump is connected to the proportional valve group through a second steering oil pipe.

[0010] The proportional valve group is connected to a steering assist cylinder through a first assist cylinder oil pipe and a second assist cylinder oil pipe.

[0011] Further, the proportional valve group is provided with a first interface and a second interface. One end of the first steering oil pipe is connected to the second steering oil tank, and the other end of the first steering oil pipe is connected to the first interface. One end of the second steering oil pipe is connected to the sub-steering pump, and the other end of the second steering oil pipe is connected to the second interface.

[0012] Further, one end of the steering assist cylinder is arranged on a lifting shaft, and the other end of the steering assist cylinder is connected to a lifting shaft steering arm.

[0013] Further, the main steering pump and the sub-steering pump are vane pumps.

[0014] Further, the second steering oil tank is arranged on a vehicle frame at the lower end of a cab and is located on the left side of an engine.

[0015] Further, the proportional valve group is arranged on an aircraft beam provided on the vehicle frame.

[0016] Further, the second steering oil tank is a steering oil tank with a volume ≥ 2.4 liters, and the maximum oil passing amount of the second steering oil tank is 30 L / min.

[0017] A multi-axle commercial vehicle includes the multi-axle commercial vehicle active steering system as described in any one of the above, and the multi-axle commercial vehicle is a 10×4 type commercial vehicle.

[0018] Compared with the prior art, the present utility model has the following beneficial technical effects:

[0019] The steering power source adopts a dual steering pump, which has one more pump than ordinary models. The main steering pump provides power for the front axle steering, and the sub-steering pump provides power for the lifting shaft steering. It is convenient and reliable to install. The hydraulic pressure drives the steering assist cylinder on the lifting shaft to work. It has low cost and high reliability, and at the same time has a simple layout and good versatility.

[0020] The active steering controller calculates the required angle of the rear axle based on the angle signal transmitted by the angle sensor, synchronously controls the valves to be opened and their opening degrees in the proportional valve group, and further controls the oil volume entering the steering assist cylinder of the lifting shaft. The oil volume entering drives the steering assist cylinder to work to achieve the active steering function. The active steering controller is arranged under the seat, well protected and reliably installed.

[0021] The proportional valve group executes the input of the active steering controller. The active steering controller controls the valves to be opened and their opening degrees inside the proportional valve group, and further controls the oil volume entering the steering assist cylinder. At the same time, the proportional valve group integrates an accumulator to ensure the centering of the lifting shaft during straight-line driving of the vehicle, guarantee the straight-line driving stability of the vehicle's lifting shaft, and can be batch-applied to the active steering of multi-axle heavy truck models. Brief Description of the Drawings

[0022] Figure 1 It is a schematic layout structure diagram of the present utility model;

[0023] Figure 2 It is a schematic connection structure diagram of the proportional valve group and the steering assist cylinder in the present utility model;

[0024] Figure 3 It is a schematic connection structure diagram of the double-connected steering pump in the present utility model.

[0025] Reference Signs

[0026] 1. Angle sensor; 2. Active steering controller; 3. Second steering oil tank; 4. Double-connected steering pump; 5. Frame; 6. First steering oil pipe; 7. Second steering oil pipe; 8. Proportional valve group; 9. Steering assist cylinder; 10. Lifting shaft; 11. First interface; 12. Second interface; 13. First oil pipe of the assist cylinder; 14. Second oil pipe of the assist cylinder; 15. Steering arm of the lifting shaft; 16. Steering gear; 17. First steering oil tank; 18. First oil outlet pipe; 19. First oil inlet pipe; 20. Second oil inlet pipe; 21. First oil return pipe. Detailed Embodiment

[0027] In order to enable those skilled in the art of this technology to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0028] As Figures 1-3As shown in the figure, a multi-axis commercial vehicle active steering system includes a steering angle sensor 1 provided on the steering column and an active steering controller 2 provided at the lower end of the vehicle seat. The steering angle sensor 1 is connected to the active steering controller 2.

[0029] The active steering controller 2 is connected to the proportional valve group 8 for control. The proportional valve group 8 is connected to the double-pump steering pump 4 and the second steering oil tank 3.

[0030] The double-pump steering pump 4 includes a main steering pump and an auxiliary steering pump connected in series. The main steering pump is connected to the first steering oil tank 17 through the first oil inlet pipe 19. The first steering oil tank 17 is connected to the steering gear 16 through the first oil return pipe 21. One end of the auxiliary steering pump is connected to the second steering oil tank 3 through the second oil inlet pipe 20. The second steering oil tank 3 is connected to the proportional valve group 8 through the first steering oil pipe 6. The other end of the auxiliary steering pump is connected to the proportional valve group 8 through the second steering oil pipe 7.

[0031] The main steering pump is connected to the first steering oil tank 17 through the first oil inlet pipe 19, and pumps the hydraulic oil in the first steering oil tank 17 into the steering gear 16 through the first oil outlet pipe 18 to realize the steering of the front axle of the vehicle. The auxiliary steering pump drives the hydraulic oil in the second steering oil tank 3 to enter the proportional valve group 8 through the first steering oil pipe 6. The auxiliary steering pump is connected to the second steering oil tank 3 through the second steering oil pipe 7.

[0032] Before the proportional valve group 8 receives the opening instruction from the active steering controller 2, the hydraulic oil circulates between the second steering oil tank 3, the double-pump steering pump 4, the first steering oil pipe 6, the second steering oil pipe 7, and the proportional valve group 8.

[0033] The proportional valve group 8 is connected to the steering assist cylinder 9 through the first assist cylinder oil pipe 13 and the second assist cylinder oil pipe 14.

[0034] The proportional valve group 8 is provided with a first interface 11 and a second interface 12. One end of the first steering oil pipe 6 is connected to the second steering oil tank 3, and the other end of the first steering oil pipe 6 is connected to the first interface 11. One end of the second steering oil pipe 7 is connected to the auxiliary steering pump, and the other end of the second steering oil pipe 7 is connected to the second interface 12.

[0035] After the proportional valve group 8 receives the instruction from the active steering controller 2, the proportional valve group 8 opens the corresponding valve, and at the same time, the valve opens a certain angle. A certain amount of hydraulic oil enters the steering assist cylinder 9 on the lifting shaft 10 through the proportional valve group 8, driving the steering assist cylinder 9 to push or pull the lifting shaft steering arm 15 to realize the rotation of the lifting shaft tire.

[0036] When the lifting shaft 10 rotates in a certain direction and the vehicle needs to rotate in the other direction, the active steering controller 2 sends an instruction to the proportional valve group 8. The proportional valve group 8 opens the valve in the other direction, and the valve opens by a certain angle. A certain amount of hydraulic oil enters the steering assist cylinder 9 on the lifting shaft 10 through the proportional valve group 8, driving the steering assist cylinder 9 to push or pull the lifting shaft steering arm 15, so as to realize the rotation of the lifting shaft tire in the other direction.

[0037] One end of the steering assist cylinder 9 is arranged on the lifting shaft 10, and the other end of the steering assist cylinder 9 is connected to the lifting shaft steering arm 15.

[0038] The main steering pump and the auxiliary steering pump are vane pumps.

[0039] The second steering oil tank 3 is arranged on the vehicle frame 5 at the lower end of the cab and is located on the left side of the engine.

[0040] The proportional valve group 8 is arranged on the aircraft beam provided on the vehicle frame 5.

[0041] The second steering oil tank 3 is a steering oil tank with a volume ≥ 2.4 liters, and the maximum oil passing amount of the second steering oil tank 3 is 30 L / min.

[0042] A multi-axle commercial vehicle includes the multi-axle commercial vehicle active steering system as described above, and the multi-axle commercial vehicle is a 10×4 type commercial vehicle.

Claims

1. An active steering system for a multi-axle commercial vehicle, characterized in that: The invention comprises a rotation angle sensor (1) arranged on a steering column and an active steering controller (2) arranged on the lower end of a vehicle seat, wherein the rotation angle sensor (1) is connected to the active steering controller (2). The active steering controller (2) is controllably connected to a proportional valve group (8), and the proportional valve group (8) is connected to a double steering pump (4) and a second steering oil tank (3).

2. The multi-axle commercial vehicle active steering system according to claim 1, characterized in that: The double steering pump (4) comprises a main steering pump and an auxiliary steering pump connected in series, the main steering pump being connected to a first steering oil tank (17) via a first oil inlet pipe (19), the first steering oil tank (17) being connected to a steering gear (16) via a first oil return pipe (21); one end of the auxiliary steering pump being connected to a second steering oil tank (3) via a second oil inlet pipe (20), the second steering oil tank (3) being connected to a proportional valve group (8) via a first steering oil pipe (6), and the other end of the auxiliary steering pump being connected to a proportional valve group (8) via a second steering oil pipe (7); The proportional valve group (8) is connected to the steering booster cylinder (9) via a first booster cylinder oil pipe (13) and a second booster cylinder oil pipe (14).

3. The multi-axle commercial vehicle active steering system according to claim 2, characterized in that: The proportional valve group (8) is provided with a first interface (11) and a second interface (12); one end of the first steering oil pipe (6) is connected to the second steering oil tank (3), and the other end of the first steering oil pipe (6) is connected to the first interface (11); one end of the second steering oil pipe (7) is connected to the auxiliary steering pump, and the other end of the second steering oil pipe (7) is connected to the second interface (12).

4. The multi-axle commercial vehicle active steering system according to claim 2, characterized in that: One end of the steering assist cylinder (9) is arranged on the lifting shaft (10), and the other end of the steering assist cylinder (9) is connected to the lifting shaft steering arm (15).

5. The multi-axle commercial vehicle active steering system according to claim 2, characterized in that: The main steering pump and the auxiliary steering pump are vane type pumps.

6. The multi-axle commercial vehicle active steering system according to claim 2, characterized in that: The second steering oil tank (3) is arranged on the frame (5) at the lower end of the cab, and is located on the left side of the engine.

7. The multi-axle commercial vehicle active steering system according to claim 3, characterized in that: The proportional valve group (8) is arranged on an aircraft beam provided on the vehicle frame (5).

8. The multi-axle commercial vehicle active steering system according to claim 3, characterized in that: The second steering oil tank (3) is a steering oil tank with a volume of ≥2.4 liters, and the maximum oil flow rate of the second steering oil tank (3) is 30 L / min.

9. A multi-axle commercial vehicle, comprising the multi-axle commercial vehicle active steering system according to any one of claims 1 to 8, characterized in that: The multi-axle commercial vehicle is a 10×4 commercial vehicle.

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