A hydraulic cylinder and valve group system for active steering system

Abstract

The present invention discloses a hydraulic cylinder and valve group system for an active steering system, which relates to the field of vehicle steering technology, including a hydraulic cylinder and a valve group assembly. The valve group assembly includes a valve body and a valve. The valve body is arranged on the hydraulic cylinder. The valve body is provided with a flow channel for supplying hydraulic oil to flow and a valve for controlling the hydraulic oil in the flow channel to enable the hydraulic cylinder to move. The present invention adopts an integrated design with a compact structure and reduces hydraulic pipelines. On the one hand, it greatly improves space utilization, avoids compressing the installation space of other chassis devices, and facilitates layout; on the other hand, it reduces the risk of steering failure caused by pipeline damage, thereby improving steering safety.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle steering, in particular to a hydraulic cylinder and valve group system for an active steering system. Background Art

[0002] With rapid economic development, demand for commercial vehicles continues to increase, along with the requirements for their maneuverability. Commercial vehicles typically have many axles, large tonnage, long bodies, high centers of mass, and operate in harsh environments. They typically have front-axle steering, resulting in a large turning radius, severe rear tire wear, and are prone to tailspin and roll risk at high speeds. Active steering technology, when steering axles other than the front axle, can reduce the vehicle's minimum turning radius, improving maneuverability, handling stability, and passability, making it a key tool for improving vehicle maneuverability.

[0003] With the continuous improvement of vehicle turning radius and load requirements, more and more models have adopted active steering technology on the rear axle in recent years.

[0004] Currently, the actuators in active steering systems on vehicles typically use hydraulic cylinders. Due to the numerous hydraulic pipes involved, these systems require significant chassis space during installation, compromising the installation space for other chassis components and making layout inconvenient. Furthermore, the numerous hydraulic pipes increase the risk of steering failure due to pipe damage, reducing steering safety. Summary of the Invention

[0005] The present invention addresses the above-mentioned deficiencies in the prior art and provides a hydraulic cylinder and valve group system for an active steering system. The present invention adopts an integrated design with a compact structure and reduces hydraulic pipelines. On the one hand, it greatly improves space utilization, avoids compressing the installation space of other chassis devices, and facilitates layout; on the other hand, it reduces the risk of steering failure caused by pipeline damage and improves steering safety.

[0006] To achieve the above objectives, the invention provides the following technical solutions:

[0007] A hydraulic cylinder and valve group system for an active steering system includes a hydraulic cylinder and a valve group assembly. The valve group assembly includes a valve body and a valve. The valve body is arranged on the hydraulic cylinder. The valve body is provided with a flow channel for supplying hydraulic oil and a valve for controlling the hydraulic oil in the flow channel to activate the hydraulic cylinder.

[0008] Furthermore, the hydraulic cylinder is provided with a left end oil port, a middle position oil return port, and a right end oil port. The valves include a shuttle valve, a one-way valve 1, a one-way valve 2, a balancing valve 1, a balancing valve 2, and a hydraulically controlled one-way valve. The balancing valve 1 includes a relief valve 1 and a one-way valve 3, and the balancing valve 2 includes a relief valve 2 and a one-way valve 4.

[0009] The left end oil port is connected to the outlet of the one-way valve through a hydraulic pipe, and the inlet of the one-way valve is connected to the oil pump through a hydraulic pipe. The oil pump is used to pump the hydraulic oil in the oil tank;

[0010] The oil port on the right is connected to the outlet of the one-way valve 2 through a hydraulic pipe, and the inlet of the one-way valve 2 is also connected to the oil pump through a hydraulic pipe;

[0011] The center oil return port is connected to the liquid inlet of the hydraulically controlled one-way valve through a hydraulic pipe, the liquid outlet of the hydraulically controlled one-way valve is connected to the oil tank through a hydraulic pipe, and the control port of the hydraulically controlled one-way valve is connected to the liquid outlet of the shuttle valve through the flow channel;

[0012] One liquid inlet of the shuttle valve is connected to the liquid inlet of the one-way valve through a flow channel, and the other liquid inlet of the shuttle valve is connected to the liquid inlet of the second one-way valve through a flow channel;

[0013] The liquid inlet of the relief valve 1 is connected to the liquid outlet of the check valve 1 through the flow channel, the liquid outlet of the relief valve 1 is connected to the oil tank through the flow channel, and the control port of the relief valve 1 is connected to the liquid inlet of the check valve 2 through the flow channel;

[0014] The liquid inlet of the one-way valve three is connected to the liquid outlet of the relief valve one through a flow channel, and the liquid outlet of the one-way valve three is connected to the liquid inlet of the relief valve one through a flow channel;

[0015] The liquid inlet of the relief valve 2 is connected to the liquid outlet of the check valve 2 through a flow channel, the liquid outlet of the relief valve 2 is connected to the liquid outlet of the relief valve 1 through a flow channel, and the control port of the relief valve 2 is connected to the liquid inlet of the check valve 1 through a flow channel;

[0016] The liquid inlet of the one-way valve 4 is connected to the liquid outlet of the relief valve 2 through a flow channel, and the liquid outlet of the one-way valve 4 is connected to the liquid inlet of the relief valve 2 through a flow channel.

[0017] Furthermore, the oil pump is a bidirectional pump, the liquid inlet of the one-way valve 1 is connected to one outlet of the bidirectional pump through the hydraulic pipe, and the liquid inlet of the two-way valve is connected to the other outlet of the bidirectional pump through the hydraulic pipe.

[0018] Furthermore, the valve body is a hexahedral structure, and the valve body includes end face 1, end face 2, side face 1, side face 2, side face 3, and side face 4. End face 1 and end face 2 are arranged oppositely, side faces 1 to 4 are arranged between end face 1 and end face 2, side face 1 and side face 3 are arranged oppositely, and side face 2 and side face 4 are arranged oppositely.

[0019] In the direction from left to right: the shuttle valve is provided on side one; the hydraulically controlled one-way valve, the one-way valve one, and the balancing valve two are provided in sequence on side two; the balancing valve one and the one-way valve two are provided in sequence on side four, and the balancing valve one is provided corresponding to the one-way valve one, and the one-way valve two is provided corresponding to the balancing valve two.

[0020] Furthermore, the hydraulic cylinder includes a cylinder barrel, a base, a cylinder cover, a piston, and a piston rod. The left end of the cylinder barrel is provided with the valve body and the base in sequence, the right end of the cylinder barrel is provided with a cylinder cover, a piston is provided inside the cylinder barrel, and the piston is provided with a piston rod passing through the cylinder cover. The piston divides the interior of the cylinder barrel into a left oil chamber and a right oil chamber. The left oil chamber is located on the left side of the piston, and the right oil chamber is located on the right side of the piston. The left end oil port is connected to the left oil chamber, and the right end oil port is connected to the right oil chamber.

[0021] Furthermore, the hydraulic cylinder also includes a displacement sensor for detecting the displacement of the piston rod.

[0022] Furthermore, the displacement sensor adopts a magnetostrictive sensor.

[0023] Compared with the prior art, the beneficial effects of the invention are:

[0024] 1. In the hydraulic cylinder assembly of the present invention, the hydraulic cylinder and valve assembly are integrated into one body. The valve assembly integrates various valves within the valve body and utilizes internal flow channels within the valve body to connect the valves. This reduces the use of hydraulic pipes and results in a compact structure. This reduces the space occupied on the vehicle chassis, significantly improving space utilization and facilitating the placement of other devices on the vehicle chassis. Furthermore, it reduces the risk of steering failure due to hydraulic pipe damage, thereby improving steering safety.

[0025] 2. In the hydraulic cylinder assembly of the present invention, the shuttle valve can close the hydraulically controlled one-way valve when the hydraulic cylinder extends or retracts to keep the center oil return port closed. The shuttle valve can also open the hydraulically controlled one-way valve when the hydraulic cylinder maintains a center position to open the center oil return port for oil leakage. One-way valve 1 can ensure that the hydraulic oil enters the left end oil port of the hydraulic cylinder in one direction to prevent backflow. One-way valve 2 can ensure that the hydraulic oil enters the right end oil port of the hydraulic cylinder in one direction to prevent backflow. Both balancing valve 1 and balancing valve 2 are used to balance the flow channel in the valve body and the pressure in the hydraulic pipe, so that the valve group assembly remains stable and further improves steering safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a hydraulic cylinder and valve group system for an active steering system Figure 1 ;

[0027] Figure 2 A schematic diagram of the structure of a hydraulic cylinder and valve group system for an active steering system Figure 2 ;

[0028] Figure 3 Schematic diagram of the overall structure of the valve group assembly;

[0029] Figure 4 It is a front view schematic diagram of the valve group assembly;

[0030] Figure 5 Schematic diagram of the top view of the valve group assembly;

[0031] Figure 6 It is a structural diagram of a balancing valve;

[0032] Figure 7 It is the structural diagram of the balancing valve 2;

[0033] Figure 8 This is a hydraulic principle diagram of a hydraulic cylinder and valve group system for an active steering system.

[0034] In the picture:

[0035] DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] Example 1:

[0038] like Figure 1-2 As shown, a hydraulic cylinder and valve group system for an active steering system includes a hydraulic cylinder and a valve group assembly.

[0039] like Figure 1-2 As shown in the figure, the hydraulic cylinder is the actuator in the active steering system. The hydraulic cylinder includes a cylinder barrel, a base, a cylinder head, a piston, a piston rod, and a displacement sensor.

[0040] like Figure 1-2 As shown in FIG, the valve assembly and the base are sequentially mounted on the left end of the cylinder barrel, and the cylinder head is mounted on the right end of the cylinder barrel.

[0041] like Figure 2 As shown, a piston is installed inside the cylinder, which divides the inside of the cylinder into a left oil chamber A and a right oil chamber B. The left oil chamber A is located on the left side of the piston, and the right oil chamber B is located on the right side of the piston.

[0042] like Figure 2 As shown, the left end of the cylinder is provided with a left end oil port, which communicates with the left oil chamber A. The right end of the cylinder is provided with a right end oil port, which communicates with the right oil chamber B. The middle of the cylinder is provided with a center oil return port. When the space of the left oil chamber A increases, the center oil return port communicates with the left oil chamber A. When the space of the right oil chamber B increases, the center oil return port communicates with the right oil chamber B.

[0043] like Figure 2As shown, a piston rod is mounted on the piston and passes through the cylinder head.

[0044] like Figure 2 As shown, the displacement sensor is used to detect the displacement of the piston rod. In this embodiment, the sensor adopts a magnetostrictive sensor. Magnetostrictive sensors are currently mature products.

[0045] like Figure 2 As shown, the magnetostrictive sensor's sensor head is fixedly mounted inside the cylinder. A chamber C is defined within the piston rod for accommodating the magnetostrictive sensor's detection rod and a movable float. The movable float is fixedly mounted within chamber C. When the piston rod extends or retracts, it moves with the movable float, causing the movable float, mounted on the detection rod, to shift on the rod. This causes the magnetostrictive sensor to transmit a corresponding displacement signal to the ECU. After receiving the signal from the magnetostrictive sensor, the ECU controls the piston rod to perform the next action.

[0046] like Figure 1-7 As shown in the figure, the valve group assembly includes a valve body and valves. The valves include a shuttle valve, a check valve 1, a check valve 2, a balancing valve 1, a balancing valve 2, and a hydraulically controlled check valve.

[0047] like Figure 3-5 As shown, the valve body is a hexahedron structure, including end face 1, end face 2, side face 1, side face 2, side face 3, and side face 4. End face 1 and end face 2 are arranged opposite each other, with end face 1 located to the right of end face 2. Side faces 1 to 4 are all arranged between end face 1 and end face 2, with side face 1 and side face 3 opposite each other, and side face 2 and side face 4 opposite each other.

[0048] like Figure 1-2 As shown, the left end of the cylinder is installed on the end surface one, and the base is installed on the end surface two.

[0049] like Figure 3-5 As shown, from left to right: the shuttle valve and the sensor interface are installed on the side one in sequence; the hydraulic control one-way valve, the one-way valve one, and the balancing valve two are installed on the side two in sequence; the balancing valve one and the one-way valve two are installed on the side four in sequence, and the balancing valve one corresponds to the one-way valve one setting, and the one-way valve two corresponds to the balancing valve two setting.

[0050] The sensor interface connects the magnetostrictive sensor and the ECU controller.

[0051] like Figure 8 As shown, the shuttle valve is provided with two liquid inlets and one liquid outlet, which are respectively denoted as liquid inlet P1, liquid inlet P2, and liquid outlet P3.

[0052] like Figure 8 As shown, the one-way valve 1 is provided with a liquid inlet and a liquid outlet, which are respectively denoted as the liquid inlet P4 and the liquid outlet P5.

[0053] like Figure 8 As shown, the one-way valve 2 is provided with a liquid inlet and a liquid outlet, which are respectively denoted as the liquid inlet P6 and the liquid outlet P7.

[0054] like Figure 6 As shown, the balancing valve 1 includes a relief valve 1 and a one-way valve 3.

[0055] like Figure 8 As shown, relief valve 1 is a pilot-operated relief valve. It has an inlet, an outlet, and a control port, designated as inlet P8, outlet P9, and control port P10. The pilot valve in relief valve 1 is set to a pressure of 18 MPa.

[0056] like Figure 8 As shown, the one-way valve 3 is provided with a liquid inlet and a liquid outlet, which are respectively denoted as the liquid inlet P11 and the liquid outlet P12.

[0057] like Figure 7 As shown, the balancing valve 2 includes a relief valve 2 and a one-way valve 4.

[0058] like Figure 8 As shown, relief valve 2 is a pilot-operated relief valve. It has an inlet, an outlet, and a control port, designated as inlet P13, outlet P14, and control port P15. The pilot valve in relief valve 2 is set to a pressure of 18 MPa.

[0059] like Figure 8 As shown, the one-way valve 4 is provided with a liquid inlet and a liquid outlet, which are respectively denoted as the liquid inlet P16 and the liquid outlet P17.

[0060] like Figure 8 As shown, the hydraulically controlled one-way valve is provided with a liquid inlet, a liquid outlet and a control port, which are respectively denoted as the liquid inlet P18, the liquid outlet P19 and the control port P20.

[0061] The connection relationship of the above valves is as follows:

[0062] like Figure 8 As shown, the left end oil port on the hydraulic cylinder barrel is connected to the outlet P5 of the one-way valve one through a hydraulic pipe, and the inlet P4 of the one-way valve one is connected to an outlet of the two-way pump through a hydraulic pipe. The two-way pump is used to transport the hydraulic oil in the oil tank to the left oil chamber A in the hydraulic cylinder barrel.

[0063] like Figure 8 As shown, the right end oil port on the hydraulic cylinder barrel is connected to the outlet P7 of the one-way valve 2 through a hydraulic pipe, and the inlet P6 of the one-way valve 2 is connected to the other outlet of the two-way pump through a hydraulic pipe. The two-way pump is used to transport the hydraulic oil in the tank to the right oil chamber B in the hydraulic cylinder barrel.

[0064] like Figure 8 As shown, the center oil return port on the hydraulic cylinder barrel is connected to the liquid inlet P18 of the hydraulic control one-way valve through a hydraulic pipe, the liquid outlet P19 of the hydraulic control one-way valve is connected to the oil tank through a hydraulic pipe, and the control port P20 of the hydraulic control one-way valve is connected to the liquid outlet P3 of the shuttle valve through the flow channel in the valve body.

[0065] like Figure 8 As shown, the liquid inlet P1 of the shuttle valve is connected to the liquid inlet P4 of the one-way valve through the flow channel in the valve body, and the liquid inlet P2 of the shuttle valve is connected to the liquid inlet P6 of the two-way valve through the flow channel in the valve body.

[0066] like Figure 8 As shown, the liquid inlet P8 of the overflow valve 1 is connected to the liquid outlet P5 of the one-way valve 1 through the flow channel in the valve body, the liquid outlet P9 of the overflow valve 1 is connected to the oil tank through the flow channel in the valve body, and the control port P10 of the overflow valve 1 is connected to the liquid inlet P6 of the one-way valve 2 through the flow channel in the valve body.

[0067] like Figure 8 As shown, the liquid inlet P11 of the one-way valve three is connected to the liquid outlet P9 of the relief valve one through the flow channel in the valve body, and the liquid outlet P12 of the one-way valve three is connected to the liquid inlet P8 of the relief valve one through the flow channel in the valve body.

[0068] like Figure 8 As shown, the liquid inlet P13 of the overflow valve 2 is connected to the liquid outlet P7 of the one-way valve 2 through the flow channel in the valve body, the liquid outlet P14 of the overflow valve 2 is connected to the liquid outlet P9 of the overflow valve 1 through the flow channel in the valve body, and the control port P15 of the overflow valve 2 is connected to the liquid inlet P4 of the one-way valve 1 through the flow channel in the valve body.

[0069] like Figure 8 As shown, the liquid inlet P16 of the one-way valve four is connected to the liquid outlet P14 of the relief valve two through the flow channel in the valve body, and the liquid outlet P17 of the one-way valve four is connected to the liquid inlet P13 of the relief valve two through the flow channel in the valve body.

[0070] like Figure 8 As shown, the control unit includes an ECU, a servo motor, and a bidirectional pump. The ECU receives piston rod displacement information detected by the magnetostrictive sensor and controls the servo motor. The servo motor drives the bidirectional pump, which pumps hydraulic oil from the tank into the hydraulic cylinder.

[0071] (1) Working process 1: When the piston moves to the right, the left oil chamber A is in the oil inlet state, the right oil chamber B is in the oil return state, and the piston rod gradually extends.

[0072] During the oil inlet process, the first part of the hydraulic oil from the oil tank enters the left oil chamber A through the liquid inlet P4 of the one-way valve 1, the one-way valve 1, the liquid outlet P5 of the one-way valve 1, and the left end oil port.

[0073] Moreover, during the oil inlet process, the second part of the hydraulic oil from the oil tank enters the hydraulically controlled one-way valve through the shuttle valve's liquid inlet P1, the shuttle valve, the shuttle valve's liquid outlet P3, and the control port P20 of the hydraulically controlled one-way valve, allowing the valve core in the hydraulically controlled one-way valve to block the hydraulically controlled one-way valve's liquid inlet P18, thereby ensuring that the neutral oil return port remains closed.

[0074] In addition, during the oil inlet process, the third part of the hydraulic oil from the oil tank enters the control port P15 of the relief valve 2. At this time, the pressure of the control port P15 of the relief valve 2 is greater than the set pressure of the pilot valve in the relief valve 2, 18MPa, so that when the pressure of the relief valve 2 inlet P13 increases to be sufficient to overcome the set pressure of the pilot valve 18MPa, the hydraulic oil entering the relief valve 2 inlet P13 can flow out from the relief valve 2 outlet P14.

[0075] In addition, during the oil inlet process, the control port P10 of the relief valve one is in a closed state because it is connected to the liquid inlet P6 of the one-way valve two, and the liquid inlet P6 of the one-way valve two is connected to an outlet of the two-way pump. This outlet does not pump hydraulic oil to the one-way valve two, so the control port P10 of the relief valve one is in a closed state. The pressure of the control port P10 of the relief valve one in the closed state is greater than the set pressure of the pilot valve in the relief valve one, 18MPa, so that when the pressure of the liquid inlet P8 of the relief valve one increases to a level sufficient to overcome the set pressure of the pilot valve 18MPa, the hydraulic oil entering at the liquid inlet P8 of the relief valve one can flow out from the liquid outlet P9 of the relief valve one.

[0076] During the oil return process, the hydraulic oil from the right oil chamber B returns to the oil tank through the right end oil port, the liquid inlet P13 of the relief valve 2, the relief valve 2, and the liquid outlet P14 of the relief valve 2.

[0077] In addition, during the oil return process, a portion of the hydraulic oil flowing from the outlet P14 of relief valve two to the oil tank passes through the inlet P11 of one-way valve three, one-way valve three, the outlet P12 of one-way valve three, the inlet P8 of relief valve one, relief valve one, and the outlet P9 of relief valve one back to the oil tank.

[0078] During the continuous oil inlet process, the oil inlet pressure is too high, and a part of the hydraulic oil flowing from the one-way valve outlet P5 to the left end oil port continues to enter the left oil chamber A, and the other part of the hydraulic oil flowing from the one-way valve outlet P5 to the left end oil port will pass through the overflow valve inlet P8, overflow valve 1, and overflow valve outlet P9 back to the oil tank.

[0079] Moreover, during the continuous oil inflow process, a portion of the hydraulic oil flowing from the outlet P9 of the overflow valve one to the oil tank passes through the inlet P16 of the one-way valve four, the one-way valve four, the outlet P17 of the one-way valve four, the inlet P13 of the overflow valve two, the overflow valve two, and the outlet P14 of the overflow valve two back to the oil tank.

[0080] (2) Working process 2: When the piston moves to the left, the left oil chamber A is in the oil return state, the right oil chamber B is in the oil inlet state, and the piston rod gradually retracts.

[0081] During the oil inlet process, the first part of the hydraulic oil from the oil tank enters the right oil chamber B through the inlet P6 of the one-way valve 2, the one-way valve 2, the outlet P7 of the one-way valve 2, and the right end oil port.

[0082] Moreover, during the oil inlet process, the second part of the hydraulic oil from the oil tank enters the hydraulically controlled one-way valve through the shuttle valve's liquid inlet P2, the shuttle valve, the shuttle valve's liquid outlet P3, and the control port P20 of the hydraulically controlled one-way valve, allowing the valve core in the hydraulically controlled one-way valve to block the hydraulic inlet P18 of the hydraulically controlled one-way valve, thereby ensuring that the neutral oil return port remains closed.

[0083] In addition, during the oil inlet process, the third part of the hydraulic oil from the oil tank enters the control port P10 of the relief valve one. At this time, the pressure of the control port P10 of the relief valve one is greater than the set pressure of the pilot valve in the relief valve one, 18MPa, so that when the pressure of the relief valve one inlet P8 increases to a level sufficient to overcome the set pressure of the pilot valve 18MPa, the hydraulic oil entering the relief valve one at the inlet P8 can flow out from the outlet P9 of the relief valve one.

[0084] In addition, during the oil inlet process, the control port P15 of the relief valve 2 is in a closed state because it is connected to the liquid inlet P4 of the one-way valve 1, and the liquid inlet P4 of the one-way valve 1 is connected to an outlet of the two-way pump. This outlet does not pump hydraulic oil to the one-way valve 1, so the control port P15 of the relief valve 2 is in a closed state. The pressure of the control port P15 of the relief valve 2 in the closed state is greater than the set pressure of the pilot valve in the relief valve 2, 18MPa, so that when the pressure of the liquid inlet P13 of the relief valve 2 increases to a level sufficient to overcome the set pressure of the pilot valve 18MPa, the hydraulic oil entering at the liquid inlet P13 of the relief valve 2 can flow out from the liquid outlet P14 of the relief valve 2.

[0085] During the oil return process, the hydraulic oil from the left oil chamber A returns to the oil tank through the left end oil port, the liquid inlet P8 of the relief valve 1, the relief valve 1, and the liquid outlet P9 of the relief valve 1.

[0086] In addition, during the oil return process, a portion of the hydraulic oil flowing from the outlet P14 of the overflow valve one to the oil tank passes through the inlet P16 of the one-way valve four, the one-way valve four, the outlet P17 of the one-way valve four, the inlet P13 of the overflow valve two, the overflow valve two, and the outlet P14 of the overflow valve two and returns to the oil tank.

[0087] During the continuous oil inlet process, the oil inlet pressure is too large, and a part of the hydraulic oil flowing from the one-way valve second outlet P6 to the right end oil port continues to enter the right oil chamber B, and the other part of the hydraulic oil flowing from the one-way valve second outlet P6 to the right end oil port will pass through the overflow valve second inlet P13, overflow valve second, and overflow valve second outlet P14 and return to the oil tank.

[0088] Moreover, during the continuous oil inflow process, a portion of the hydraulic oil flowing from the outlet P14 of the relief valve two to the oil tank passes through the inlet P11 of the one-way valve three, the one-way valve three, the outlet P12 of the one-way valve three, the inlet P8 of the relief valve one, the relief valve one, and the outlet P9 of the relief valve one back to the oil tank.

[0089] (3) Working process three: When the piston and piston rod in the hydraulic cylinder are in the middle position and do not move, the shuttle valve controls the hydraulic control one-way valve to open, and the hydraulic oil in the hydraulic cylinder returns to the oil tank through the middle oil return port, the liquid inlet 18 of the hydraulic control one-way valve, the hydraulic control one-way valve, and the liquid outlet 19 of the hydraulic control one-way valve.

[0090] As can be seen from the above description, in the hydraulic cylinder assembly of this embodiment, the hydraulic cylinder and valve assembly are integrated into one body. The valve assembly integrates various valves within the valve body, and the valves are connected by internal flow channels within the valve body. Only the first and second check valves, as well as the hydraulic check valve, are connected to the hydraulic cylinder and the oil tank via hydraulic pipes. This reduces the use of hydraulic pipes and makes the structure compact. This reduces the space occupied on the vehicle chassis, facilitating the placement of other devices on the vehicle chassis. Furthermore, it reduces the risk of steering failure due to hydraulic pipe damage, thereby improving steering safety.

[0091] Furthermore, in the hydraulic cylinder assembly of this embodiment, the shuttle valve can close the hydraulically controlled one-way valve when the hydraulic cylinder extends or retracts to keep the center oil return port closed. The shuttle valve can also open the hydraulically controlled one-way valve when the hydraulic cylinder maintains a center position to open the center oil return port for oil leakage. One-way valve 1 can ensure that the hydraulic oil enters the left end oil port of the hydraulic cylinder in one direction to prevent backflow. One-way valve 2 can ensure that the hydraulic oil enters the right end oil port of the hydraulic cylinder in one direction to prevent backflow. Both balancing valve 1 and balancing valve 2 are used to balance the flow channel within the valve body and the pressure within the hydraulic pipe, so that the valve group assembly remains stable and further improves steering safety.

[0092] For those skilled in the art, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the scope of protection of the present invention.

Claims

1. A hydraulic cylinder and valve group system for an active steering system, comprising a hydraulic cylinder, characterized in that: It also includes a valve group assembly, which includes a valve body and a valve. The valve body is arranged on the hydraulic cylinder, and the valve body is provided with a flow channel for supplying hydraulic oil and a valve for controlling the hydraulic oil in the flow channel to actuate the hydraulic cylinder; The hydraulic cylinder is provided with a left end oil port, a middle position oil return port, and a right end oil port. The valves include a shuttle valve, a one-way valve 1, a one-way valve 2, a balancing valve 1, a balancing valve 2, and a hydraulically controlled one-way valve. The balancing valve 1 includes a relief valve 1 and a one-way valve 3, and the balancing valve 2 includes a relief valve 2 and a one-way valve 4. The left end oil port is connected to the outlet of the one-way valve through a hydraulic pipe, and the inlet of the one-way valve is connected to the oil pump through a hydraulic pipe. The oil pump is used to pump the hydraulic oil in the oil tank; The oil port on the right is connected to the outlet of the one-way valve 2 through a hydraulic pipe, and the inlet of the one-way valve 2 is also connected to the oil pump through a hydraulic pipe; The center oil return port is connected to the liquid inlet of the hydraulically controlled one-way valve through a hydraulic pipe, the liquid outlet of the hydraulically controlled one-way valve is connected to the oil tank through a hydraulic pipe, and the control port of the hydraulically controlled one-way valve is connected to the liquid outlet of the shuttle valve through the flow channel; One liquid inlet of the shuttle valve is connected to the liquid inlet of the one-way valve through a flow channel, and the other liquid inlet of the shuttle valve is connected to the liquid inlet of the second one-way valve through a flow channel; The liquid inlet of the relief valve 1 is connected to the liquid outlet of the check valve 1 through the flow channel, the liquid outlet of the relief valve 1 is connected to the oil tank through the flow channel, and the control port of the relief valve 1 is connected to the liquid inlet of the check valve 2 through the flow channel; The liquid inlet of the one-way valve three is connected to the liquid outlet of the relief valve one through a flow channel, and the liquid outlet of the one-way valve three is connected to the liquid inlet of the relief valve one through a flow channel; The liquid inlet of the relief valve 2 is connected to the liquid outlet of the check valve 2 through a flow channel, the liquid outlet of the relief valve 2 is connected to the liquid outlet of the relief valve 1 through a flow channel, and the control port of the relief valve 2 is connected to the liquid inlet of the check valve 1 through a flow channel; The liquid inlet of the one-way valve 4 is connected to the liquid outlet of the relief valve 2 through a flow channel, and the liquid outlet of the one-way valve 4 is connected to the liquid inlet of the relief valve 2 through a flow channel.

2. The hydraulic cylinder and valve group system for an active steering system according to claim 1, characterized in that: The oil pump is a bidirectional pump, the liquid inlet of the one-way valve is connected to one outlet of the bidirectional pump through the hydraulic pipe, and the liquid inlet of the two-way valve is connected to the other outlet of the bidirectional pump through the hydraulic pipe.

3. A hydraulic cylinder and valve group system for an active steering system according to claim 1 or 2, characterized in that: The valve body is a hexahedral structure, and the valve body includes end face 1, end face 2, side face 1, side face 2, side face 3, and side face 4. End face 1 and end face 2 are arranged opposite to each other, side faces 1 to 4 are arranged between end face 1 and end face 2, side face 1 and side face 3 are arranged opposite to each other, and side face 2 and side face 4 are arranged opposite to each other. In the direction from left to right: the shuttle valve is provided on side one; the hydraulically controlled one-way valve, the one-way valve one, and the balancing valve two are provided in sequence on side two; the balancing valve one and the one-way valve two are provided in sequence on side four, and the balancing valve one is provided corresponding to the one-way valve one, and the one-way valve two is provided corresponding to the balancing valve two.

4. The hydraulic cylinder and valve group system for an active steering system according to claim 3, characterized in that: The hydraulic cylinder includes a cylinder barrel, a base, a cylinder cover, a piston, and a piston rod. The valve body and the base are provided in sequence at the left end of the cylinder barrel, and the cylinder cover is provided at the right end of the cylinder barrel. A piston is provided inside the cylinder barrel, and a piston rod passing through the cylinder cover is provided on the piston. The piston divides the interior of the cylinder barrel into a left oil chamber and a right oil chamber. The left oil chamber is located on the left side of the piston, and the right oil chamber is located on the right side of the piston. The left end oil port is connected to the left oil chamber, and the right end oil port is connected to the right oil chamber.

5. The hydraulic cylinder and valve group system for an active steering system according to claim 4, characterized in that: The hydraulic cylinder further includes a displacement sensor for detecting the displacement of the piston rod.

6. The hydraulic cylinder and valve assembly system for an active steering system according to claim 5, characterized in that: The displacement sensor adopts a magnetostrictive sensor.

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