Steering valve group, steering system and vehicle

Abstract

The utility model relates to the technical field of electromagnetic steering valves, in particular to a steering valve set, a steering system and a vehicle. The steering valve set comprises a first oil way, a second oil way, an electromagnetic valve, a first one-way throttling valve and a second one-way throttling valve, a first oil port of the electromagnetic valve is used for being communicated with a first cavity of a steering oil cylinder through the first oil way, and a second oil port of the electromagnetic valve is used for being communicated with a second cavity of the steering oil cylinder through the second oil way. A third oil port of the electromagnetic valve is communicated with the oil tank and used for feeding oil, a fourth oil port of the electromagnetic valve is communicated with the oil tank and used for returning oil, the first oil way is provided with a first one-way throttle valve, the first one-way throttle valve is used for controlling the oil feeding amount of the first oil way, and the second oil way is provided with a second one-way throttle valve. The second one-way throttle valve is used for controlling the oil inlet amount of the second oil way. The steering valve group has the advantages of being simple in structure, low in cost, capable of controlling the steering speed and flexible in steering.

Description

Technical Field

[0001] The present application relates to the technical field of electromagnetic steering valves, and in particular to a steering valve group, a steering system and a vehicle. Background Art

[0002] The steering control of existing vehicles, such as agricultural harvesters, is mostly mechanical steering gear, which requires manual operation, and the steering speed cannot be controlled, and fast and accurate steering control cannot be achieved. At present, some vehicles have also replaced the manual reversing valve with an electromagnetic steering valve group, however, the existing electromagnetic steering valve group is usually complex in structure and high in cost. Utility Model Content

[0003] The present application discloses a steering valve group, a steering system and a vehicle to solve the problem that the existing electromagnetic steering valve group is usually complex in structure and high in cost.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] In a first aspect, the present application provides a steering valve group, which includes a first oil circuit, a second oil circuit, a solenoid valve, a first one-way throttle valve and a second one-way throttle valve, wherein the first oil port of the solenoid valve is used to communicate with the first chamber of the steering cylinder through the first oil circuit, the second oil port of the solenoid valve is used to communicate with the second chamber of the steering cylinder through the second oil circuit, the third oil port of the solenoid valve is connected to the oil tank and is used for oil intake, the fourth oil port of the solenoid valve is connected to the oil tank and is used for oil return, the first oil circuit is provided with a first one-way throttle valve, the first one-way throttle valve is used to control the amount of oil intake of the first oil circuit, the second oil circuit is provided with a second one-way throttle valve, the second one-way throttle valve is used to control the amount of oil intake of the second oil circuit.

[0006] Furthermore, the steering valve group also includes an oil inlet, an oil return port and a third oil circuit. The oil inlet is connected to the third oil port of the solenoid valve, the oil return port is connected to the fourth oil port of the solenoid valve, one end of the third oil circuit is connected to the oil inlet, and the other end of the third oil circuit is connected to the oil return port. The third oil circuit is provided with an overflow valve.

[0007] Furthermore, the overflow valve includes a first valve body, the first valve body includes a first valve cavity, a first valve core, a first valve seat and an oil inlet passage, the first valve cavity is connected to the oil inlet passage through a first connecting port, the first valve core is arranged in the first valve cavity, the first valve seat is arranged at the first connecting port, and the end of the first valve core close to the first connecting port is a tapered end; wherein, when the pressure in the oil inlet passage is less than a preset value, the tapered end abuts against the valve seat to block the first connecting port; when the pressure in the oil inlet passage is greater than or equal to the preset value, the tapered end moves in a direction away from the valve seat to connect the oil inlet passage and the first valve cavity.

[0008] Furthermore, the first valve seat and the first valve core are of split structure; and / or, the oil inlet passage is provided with an oil inlet filter.

[0009] Furthermore, the steering valve group also includes a fourth oil circuit and a throttling reversing valve arranged in the fourth oil circuit. One end of the fourth oil circuit is connected to the return oil port, and the other end of the fourth oil circuit is connected to the front chamber of the steering cylinder. The throttling reversing valve is used to control the flow rate of the return oil in the fourth oil circuit.

[0010] Furthermore, the throttling reversing valve includes a second valve body and a second valve core, the second valve body is provided with a second valve cavity and a second inlet and a second outlet connected to the second valve cavity, the second valve core is arranged in the second valve cavity, the end of the second valve core close to the second inlet can extend into the second inlet, and the radial dimension of the end of the second valve core close to the second inlet gradually increases along the direction pointing from the second inlet to the second outlet.

[0011] Furthermore, the throttling reversing valve also includes a manual operating rod, which is transmission-connected to the second valve core.

[0012] Furthermore, the steering valve group is an integrally formed structure.

[0013] In a second aspect, the present application provides a steering system, which includes an oil tank, a steering cylinder and a steering valve group of the first aspect, wherein a hydraulic valve is provided between the oil tank and the third oil port of the solenoid valve, the oil tank and the fourth oil port of the solenoid valve are connected, and the steering cylinder includes a first chamber and a second chamber, the first chamber is connected to the first oil circuit, and the second chamber is connected to the second oil circuit.

[0014] In a third aspect, the present application provides a vehicle comprising the steering system of the second aspect.

[0015] The present application provides a steering valve group, a steering system and a vehicle, wherein, when the solenoid valve is in the first working position, the oil enters the chamber of the solenoid valve through the third oil port of the solenoid valve, and flows into the first oil circuit through the first oil port. The oil enters the first chamber of the steering cylinder after being throttled by the first one-way throttle valve. At the same time, the excess oil in the second chamber of the steering cylinder can flow into the second oil circuit. The valve of the second one-way throttle valve is fully opened, and the oil flows freely and enters the chamber of the solenoid valve from the second oil port of the solenoid valve, and then flows out of the chamber of the solenoid valve through the fourth oil port, and finally flows back to the oil tank. At this time, the vehicle can be turned in the first direction; when the solenoid valve is in the second working position, the hydraulic pump enters the chamber of the solenoid valve through the third oil port of the solenoid valve, and flows into the second oil circuit through the second oil port. The oil passes through the second one-way throttle valve. After the throttling of the solenoid valve, the oil enters the second chamber of the steering cylinder. At the same time, the excess oil in the first chamber of the steering cylinder can flow into the first oil circuit. The valve of the first one-way throttle valve is fully opened, and the oil flows freely and enters the chamber of the solenoid valve from the first oil port of the solenoid valve, and then flows out of the chamber of the solenoid valve through the fourth oil port, and finally flows back to the oil tank. At this time, the vehicle can turn in the second direction; when the solenoid valve is in the third position, the first oil port, the second oil port, the third oil port, and the fourth oil port of the solenoid valve are all connected, and the vehicle is in a "floating state", that is, the vehicle can turn under the action of external force to improve the flexibility of vehicle steering. The vehicle can quickly adjust the driving direction according to changes in the road surface, such as slope, obstacles, etc., and can avoid excessive pressure in the steering cylinder, which plays a role in protecting the steering cylinder. In the present application, the first oil circuit in the steering valve group is provided with a first one-way throttle valve, and the second oil circuit is provided with a second one-way throttle valve, which can control the flow of oil entering the first chamber or the second chamber of the steering cylinder, thereby controlling the steering speed, and can achieve a balance between the first direction and the second direction. In addition, the steering valve group in the present application only includes one solenoid valve to achieve steering control, and the steering speed in the first direction and the second direction is controlled by two one-way throttle valves. There are fewer structural parts and the connection route is simple. Therefore, the steering valve group has the advantages of simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the principle of a steering valve group according to an embodiment of the present application;

[0017] Figure 2 This is a schematic diagram of the principle of a steering valve group in another embodiment of the present application;

[0018] Figure 3 A cross-sectional view of a relief valve according to an embodiment of the present application;

[0019] Figure 4 A cross-sectional view of a throttle reversing valve according to an embodiment of the present application;

[0020] Figure 5 This is a schematic structural diagram of a first one-way throttle valve and a second one-way throttle valve according to an embodiment of the present application;

[0021] Figure 6 This is a schematic structural diagram of a steering valve group according to an embodiment of the present application.

[0022] Reference numerals: 100-valve group body; 110-solenoid valve; 120-first one-way throttle valve; 121-first throttle hole; 122-first one-way valve core; 130-second one-way throttle valve; 131-second throttle hole; 132-second one-way valve core; 140-relief valve; 141-first valve body; 142-first valve seat; 143-first valve core; 143a-conical end; 143b-extension 144-first spring; 145-first spring seat; 146-oil inlet filter; 150-throttle reversing valve; 151-second valve body; 152-second valve core; 153-second spring; 154-circlip; 155-manual operating lever; 200-hydraulic pump; 300-oil tank; 400-steering cylinder; 410-front chamber; 420-rear chamber; 421-first chamber; 422-second chamber;

[0023] 10-first oil circuit; 20-second oil circuit; 30-third oil circuit; 40-fourth oil circuit;

[0024] 01- oil inlet; 02- oil return port; 03- first oil port; 04- second oil port; 05- third oil port; 06- fourth oil port; 07- first valve chamber; 08- oil inlet channel; 08a- first connecting port; 09- second valve chamber; 09a- second inlet. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] The steering control of existing vehicles, such as agricultural harvesters, is still partially mechanical, requiring manual control and the steering speed cannot be controlled. The steering control of another part of the vehicles is an electromagnetic steering valve group, which often requires multiple valves, has a complex structure and is costly.

[0027] In view of this, a steering valve group is provided in an embodiment of the present application. Figure 1 This is a schematic diagram of the principle of a steering valve group according to an embodiment of the present application, referring to Figure 1The steering valve group includes a first oil circuit 10, a second oil circuit 20, a solenoid valve 110, a first one-way throttle valve 120 and a second one-way throttle valve 130, wherein the first oil port 03 of the solenoid valve 110 is used to communicate with the first chamber 421 of the steering cylinder 400 through the first oil circuit 10, the second oil port 04 of the solenoid valve 110 is used to communicate with the second chamber 422 of the steering cylinder 400 through the second oil circuit 20, the third oil port 05 of the solenoid valve 110 is connected to the oil tank 300 and is used for oil intake, the fourth oil port 06 of the solenoid valve 110 is connected to the oil tank 300 and is used for oil return, the first oil circuit 10 is provided with a first one-way throttle valve 120, the first one-way throttle valve 120 is used to control the amount of oil intake of the first oil circuit 10, the second oil circuit 20 is provided with a second one-way throttle valve 130, the second one-way throttle valve 130 is used to control the amount of oil intake of the second oil circuit 20.

[0028] The oil inflow refers to the process of oil flowing from the oil tank 300 to the steering cylinder 400 , and the oil return refers to the process of oil flowing back to the oil tank 300 .

[0029] Optionally, the first chamber 421 may be a left chamber, and the second chamber 422 may be a right chamber. Correspondingly, when the solenoid valve 110 is in the first working position, the oil enters the chamber of the solenoid valve 110 through the third oil port 05 of the solenoid valve 110, and flows into the first oil circuit 10 through the first oil port 03. The oil enters the first chamber 421 of the steering cylinder 400 after throttling by the first one-way throttle valve 120, and the vehicle can turn left; when the solenoid valve 110 is in the second working position, the hydraulic pump 200 enters the chamber of the solenoid valve 110 through the third oil port 05 of the solenoid valve 110, and flows into the second oil circuit 20 through the second oil port 04. The oil enters the second chamber 422 of the steering cylinder 400 after throttling by the second one-way throttle valve 130, and the vehicle can turn right.

[0030] In some embodiments of the present application, the solenoid valve 110 may be a three-position four-way solenoid valve 110. It is understandable that the type of the solenoid valve 110 is not limited in the present application, as long as the switching of the three positions can be achieved. Among them, the driving voltage of the solenoid valve 110 can be designed to be 12 volts, which has lower power consumption, is relatively safe in the event of a short circuit or electric shock, and can be more easily integrated with a 12V power supply and control system, which is beneficial for simplifying system design and reducing the need for cables and connectors.

[0031] Continue to refer to Figure 1 A hydraulic pump 200 is provided on the connecting pipeline between the third oil port 05 of the solenoid valve 110 and the oil tank 300 , and the hydraulic pump 200 is used to pump the oil in the oil tank 300 into the solenoid valve 110 .

[0032] Figure 2 This is a schematic diagram of the principle of the steering valve group of another embodiment of the present application, referring to Figure 2 The steering valve group also includes an oil inlet 01, an oil return port 02 and a third oil circuit 30. The oil inlet 01 is connected to the third oil port 05 of the solenoid valve 110 through a pipeline, the oil return port 02 is connected to the fourth oil port 06 of the solenoid valve 110 through a pipeline, one end of the third oil circuit 30 is connected to the oil inlet 01, and the other end of the third oil circuit 30 is connected to the oil return port 02. The third oil circuit 30 is provided with a relief valve 140. The relief valve 140 can prevent the steering valve group from being damaged due to excessive pressure in the oil circuit of the steering valve group.

[0033] Figure 3 This is a cross-sectional view of a relief valve according to an embodiment of the present application, referring to Figure 3 The overflow valve 140 includes a first valve body 141, which includes a first valve cavity 07, a first valve core 143, a first valve seat 142 and an oil inlet passage 08. The first valve cavity 07 is connected to the oil inlet passage 08 through a first connecting port 08a. The first valve core 143 is disposed in the first valve cavity 07, and the first valve seat 142 is disposed at the first connecting port 08a. The end of the first valve core 143 close to the first connecting port 08a is a tapered end 143a. When the pressure in the oil inlet passage 08 is less than a preset value, the tapered end 143a abuts against the first valve seat 142 to block the first connecting port 08a; when the pressure in the oil inlet passage 08 is greater than or equal to a preset value, the tapered end 143a moves in a direction away from the valve seat to connect the oil inlet passage 08 with the first valve cavity 07. The oil inlet passage 08 is connected to the hydraulic pump 200.

[0034] Continue to refer to Figure 3, the overflow valve 140 further includes a first spring 144 and a first spring seat 145, the first valve core 143 includes a tapered end 143a and an extension 143b connected to the tapered end 143a, the radial dimension of the portion of the tapered end 143a connected to the extension 143b is greater than the radial dimension of the extension 143b, so as to form a step structure. The first spring 144 is sleeved on the extension 143b of the first valve core 143, one end of the first spring 144 abuts against the first spring seat 145, and the other end of the first spring 144 abuts against the step surface of the step structure. It can be understood that when the pressure in the oil inlet channel 08 is less than the preset value, the tapered end 143a extends into the first communication port 08a under the action of the first spring 144, and the tapered end 143a abuts against the valve seat to block the first communication port 08a. When the pressure in the oil inlet channel 08 is greater than or equal to a preset value, under the action of the oil pressure in the oil inlet channel 08, the first valve core 143 moves in the direction away from the first connecting port 08a and compresses the first spring 144, the first valve core 143 separates from the first valve seat 142, the oil enters the first valve chamber 07, and the pressure value in the oil inlet channel 08 decreases. When the pressure is less than the elastic force of the first spring 144, the first valve core 143 moves toward the first connecting port 08a under the action of the first spring 144 until the first valve core 143 abuts against the first valve seat 142.

[0035] In some embodiments of the present application, the first valve seat 142 and the first valve core 143 are split structures, which is beneficial to reducing the volume of the overflow valve 140.

[0036] In some embodiments of the present application, the oil inlet channel 08 is provided with an oil inlet filter 146, which can filter out impurities and particulate matter in the oil circuit to prevent them from entering the interior of the overflow valve 140, reduce valve wear, improve the reliability and safety of the steering valve group, reduce maintenance costs, and protect the performance of the overflow valve 140.

[0037] Continue to refer to Figure 2 The steering valve group further includes a fourth oil circuit 40 and a throttle reversing valve 150 disposed in the fourth oil circuit 40. One end of the fourth oil circuit 40 is connected to the oil return port 02, and the other end of the fourth oil circuit 40 is connected to the front chamber 410 of the steering cylinder 400. The throttle reversing valve 150 is used to control the flow rate of the return oil of the fourth oil circuit 40. The steering cylinder 400 includes a front chamber 410 and a rear chamber 420, and the rear chamber 420 includes the first chamber 421 and the second chamber 422 mentioned in the present application.

[0038] Figure 4 This is a cross-sectional view of a throttle reversing valve according to an embodiment of the present application, referring to Figure 4The throttle reversing valve 150 includes a second valve body 151 and a second valve core 152. The second valve body 151 is provided with a second valve cavity 09 and a second inlet 09a and a second outlet (not shown in the figure) connected to the second valve cavity 09. The second valve core 152 is arranged in the second valve cavity 09. The end of the second valve core 152 close to the second inlet 09a can extend into the second inlet 09a. Along the direction from the second inlet 09a to the second outlet, the radial dimension of the end of the second valve core 152 close to the second inlet 09a gradually increases. By adjusting the axial dimension of the second valve core 152 extending into the second inlet 09a, the size of the cross-sectional area of ​​the flow channel at the second inlet 09a can be regulated, thereby adjusting the flow rate of the oil, and further adjusting the steering speed.

[0039] In some embodiments of the present application, the throttle reversing valve 150 further includes a manual operating rod 155, which is in transmission connection with the second valve core 152. Therefore, the axial displacement of the second valve core 152 can be manually controlled, thereby realizing flow control of the return oil of the fourth oil circuit 40, that is, the steering valve group in the present application can further realize manual control of the steering speed on the basis of automatically regulating the steering speed, thereby increasing the micro-mobility of the vehicle steering, and the adjustment method is more flexible.

[0040] Continue to refer to Figure 4 The throttle reversing valve 150 further includes a second spring 153 and a snap spring 154. The snap spring 154 is fixed to the outer surface of the first valve core 143. One end of the second spring 153 is connected to the snap spring 154, and the other end of the second spring 153 abuts against the side wall of the second inlet 09a of the second valve body 151. When the second valve core 152 moves toward the direction close to the second inlet 09a under the action of an external force, the second spring 153 is in a compressed state. When the external force is removed, the second valve core 152 returns to its initial state under the action of the second spring 153.

[0041] Figure 5 This is a schematic diagram of the structure of the first one-way throttle valve and the second one-way throttle valve according to an embodiment of the present application, referring to Figure 5The first one-way throttle valve 120 includes a first throttle hole 121 and a first one-way valve core 122 matched with the first throttle hole 121. When the oil in the oil tank 300 flows into the first chamber 421 of the steering cylinder 400 through the first oil circuit 10, the first throttle hole 121 throttles the oil. The second one-way throttle valve 130 includes a second throttle hole 131 and a second one-way valve core 132 matched with the second throttle hole 131. When the oil in the oil tank 300 flows into the second chamber 422 of the steering cylinder 400 through the second oil circuit 20, the second throttle hole 131 throttles the oil. When the oil flows back from the first chamber 421 of the steering cylinder 400 to the oil tank 300, the oil reverses to open the first one-way valve core 122, so that the oil passes through the first oil circuit 10 quickly. Similarly, when the oil flows back from the second chamber 422 of the steering cylinder 400 to the oil tank 300 , the oil reverses to open the second one-way valve core 132 , allowing the oil to quickly pass through the second oil path 20 .

[0042] The first one-way throttle valve 120 and the second one-way throttle valve 130 can make the flow rates of oil in the first oil circuit 10 and the second oil circuit 20 consistent, thereby controlling the balance between the vehicle turning in the first direction or the second direction.

[0043] In some embodiments of the present application, the steering valve assembly may be an integrally formed structure. Figure 6 This is a schematic diagram of the structure of a steering valve group according to an embodiment of the present application, referring to Figure 6 The steering valve group includes a valve group body 100. The solenoid valve 110, the first oil circuit 10, the second oil circuit 20, the oil inlet 01 and the oil return port 02 in various possible embodiments of the present application are all arranged in the valve group body 100. The appearance of the steering valve group is simple, which can reduce the occupied space and avoid assembling between various valves. Optionally, the solenoid valve 110, the first oil circuit 10, the second oil circuit 20, etc. can be formed by mechanical processing, such as cutting and grinding, so as to avoid casting molds and reduce the cost of mold opening.

[0044] Of course, the components of the steering valve group in the present application may also be distributed in a decentralized manner. For example, the solenoid valve 110 and the overflow valve 140 are both separately provided and do not need to be integrated.

[0045] Based on the same technical concept, an embodiment of the present application also provides a steering system, which includes an oil tank, a steering cylinder and a steering valve group in various possible embodiments of the present application, wherein a hydraulic valve is provided between the oil tank and the third oil port of the solenoid valve, the oil tank and the fourth oil port of the solenoid valve are connected, and the steering cylinder includes a first chamber and a second chamber, the first chamber is connected to the first oil circuit, and the second chamber is connected to the second oil circuit.

[0046] The steering oil cylinder includes a front chamber and a rear chamber, and the rear chamber can be divided into a first chamber and a second chamber. Optionally, the first chamber can be a left chamber, and the second chamber can be a right chamber. By controlling the oil inflow of the first chamber and the second chamber, steering and steering speed can be controlled. The steering system includes the steering valve group in the present application, so the steering system also has the advantages of simple structure and low cost.

[0047] Based on the same technical concept, the embodiment of the present application also provides a vehicle, which includes the steering system in various possible embodiments of the present application. The vehicle may be a commercial vehicle, an agricultural vehicle, a personal vehicle, a special vehicle, etc. Because the vehicle has the steering system in the present application, the vehicle also has the advantages of flexible steering, controllable steering speed, simple structure of the steering system, and low cost.

[0048] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A steering valve group, characterized in that: The steering valve group includes a first oil circuit, a second oil circuit, a solenoid valve, a first one-way throttle valve and a second one-way throttle valve, wherein the first oil port of the solenoid valve is used to communicate with the first chamber of the steering cylinder through the first oil circuit, the second oil port of the solenoid valve is used to communicate with the second chamber of the steering cylinder through the second oil circuit, the third oil port of the solenoid valve is connected to the oil tank and is used for oil intake, the fourth oil port of the solenoid valve is connected to the oil tank and is used for oil return, the first oil circuit is provided with a first one-way throttle valve, the first one-way throttle valve is used to control the amount of oil intake of the first oil circuit, the second oil circuit is provided with a second one-way throttle valve, the second one-way throttle valve is used to control the amount of oil intake of the second oil circuit.

2. The steering valve assembly according to claim 1, characterized in that: The steering valve group also includes an oil inlet, an oil return port and a third oil circuit. The oil inlet is connected to the third oil port of the solenoid valve, the oil return port is connected to the fourth oil port of the solenoid valve, one end of the third oil circuit is connected to the oil inlet, and the other end of the third oil circuit is connected to the oil return port. The third oil circuit is provided with an overflow valve.

3. The steering valve assembly according to claim 2, characterized in that: The overflow valve comprises a first valve body, the first valve body comprises a first valve cavity, a first valve core, a first valve seat and an oil inlet passage, the first valve cavity is connected with the oil inlet passage through a first communication port, the first valve core is arranged in the first valve cavity, the first valve seat is arranged at the first communication port, and the end of the first valve core close to the first communication port is a tapered end; wherein, When the pressure in the oil inlet channel is less than a preset value, the tapered end abuts against the valve seat to block the first connecting port; when the pressure in the oil inlet channel is greater than or equal to a preset value, the tapered end moves away from the valve seat to connect the oil inlet channel and the first valve cavity.

4. The steering valve assembly according to claim 3, characterized in that: The first valve seat and the first valve core are of split structure; and / or the oil inlet passage is provided with an oil inlet filter.

5. The steering valve assembly according to claim 2, characterized in that: The steering valve group also includes a fourth oil circuit and a throttle reversing valve arranged in the fourth oil circuit. One end of the fourth oil circuit is connected to the oil return port, and the other end of the fourth oil circuit is connected to the front chamber of the steering cylinder. The throttle reversing valve is used to control the flow rate of the return oil in the fourth oil circuit.

6. The steering valve assembly according to claim 5, characterized in that: The throttling reversing valve includes a second valve body and a second valve core. The second valve body is provided with a second valve cavity and a second inlet and a second outlet communicated with the second valve cavity. The second valve core is arranged in the second valve cavity. The end of the second valve core close to the second inlet can extend into the second inlet. Along the direction from the second inlet to the second outlet, the radial dimension of the end of the second valve core close to the second inlet gradually increases.

7. The steering valve assembly according to claim 6, characterized in that: The throttling reversing valve also includes a manual operating rod, which is transmission-connected to the second valve core.

8. The steering valve assembly according to any one of claims 1 to 7, characterized in that: The steering valve group is an integrally formed structure.

9. A steering system, characterized in that: It includes an oil tank, a steering cylinder and a steering valve group as described in any one of claims 1 to 8, wherein a hydraulic valve is provided between the oil tank and the third oil port of the solenoid valve, the oil tank and the fourth oil port of the solenoid valve are connected, and the steering cylinder includes a first chamber and a second chamber, the first chamber is connected to the first oil circuit, and the second chamber is connected to the second oil circuit.

10. A vehicle, characterized in that: The vehicle includes a steering system as claimed in claim 9.

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