Pressure regulating valve and steering system

Abstract

This utility model discloses a pressure regulating valve and a steering system. The pressure regulating valve includes a valve sleeve, a valve core, and a pressure regulating assembly. The valve core has a pressure regulating oil passage, and the pressure regulating assembly is disposed in the pressure regulating oil passage. The pressure regulating assembly can disconnect or connect the inlet chamber and the return chamber when the valve core is stuck. This pressure regulating assembly can connect the inlet chamber and the return chamber when the valve core is stuck and cannot move within the receiving cavity, allowing the oil pressure in the inlet chamber to be unloaded through the return chamber, thereby maintaining a constant inlet chamber pressure. This ensures constant steering system pressure and improves the safety of the pressure regulating valve. This pressure regulating assembly prevents excessively high inlet chamber pressure, which helps ensure the valve core's pressure regulating function, improves the safety performance of the pressure regulating valve, and thus prevents the steering system filter from bursting.

Description

Technical Field

[0001] This utility model relates to the technical field of steering systems for engineering machinery, specifically to a pressure regulating valve and a steering system. Background Technology

[0002] The pressure regulating valve is an important structure in the steering system of engineering machinery used to regulate the constant hydraulic pressure.

[0003] Currently, commonly used pressure regulating valves consist of a valve sleeve and a valve core. The valve sleeve has a receiving cavity, and the valve core is housed within this cavity, dividing it into an inlet chamber and a return chamber. The valve core can reciprocate within the receiving cavity to regulate the oil pressure in the inlet chamber. However, due to issues such as oil cleanliness, the valve core can easily become stuck during its reciprocating movement within the receiving cavity, causing the valve core's pressure regulating function to fail. This, in turn, leads to increased pressure in the steering system, potentially causing the steering system filter to burst. Utility Model Content

[0004] The purpose of this invention is to at least solve some of the problems mentioned above.

[0005] To achieve this objective, the present invention proposes a pressure regulating valve, comprising:

[0006] A valve sleeve having a receiving cavity;

[0007] A valve core, which passes through the accommodating cavity, divides the accommodating cavity into an oil inlet chamber and an oil return chamber. The valve core has a pressure regulating oil passage. The valve core can reciprocate between a first position and a second position within the accommodating cavity. When the valve core is in the first position, the pressure regulating oil passage communicates with the oil inlet chamber, and oil flows from the oil inlet chamber to the pressure regulating oil passage. An increase in oil pressure in the pressure regulating oil passage drives the valve core to move from the first position to the second position. When the valve core is in the second position, the pressure regulating oil passage connects the oil inlet chamber and the oil return chamber.

[0008] A pressure regulating component is disposed in the pressure regulating oil passage. The pressure regulating component can disconnect or connect the oil inlet chamber and the oil return chamber when the valve core is stuck.

[0009] This pressure regulating component connects the inlet and outlet chambers when the valve core becomes stuck and cannot move within the receiving cavity. This allows the oil pressure in the inlet chamber to be unloaded through the outlet chamber, thus maintaining a constant inlet pressure. This ensures constant steering system pressure and improves the safety of the pressure regulating valve. This component also prevents excessively high inlet pressure, which helps maintain the valve core's pressure regulating function, improves the valve's safety performance, and ultimately prevents the steering system filter from bursting.

[0010] In some embodiments, the pressure regulating oil passage includes a first oil passage and a second oil passage, the first oil passage extending axially along the valve core, the second oil passage connecting the first oil passage and the oil inlet chamber, and the pressure regulating assembly being at least partially movable between a third position and a fourth position in the first oil passage;

[0011] When the pressure regulating component is at least partially displaced to the third position, the pressure regulating component disconnects the oil inlet chamber and the oil return chamber;

[0012] When the pressure regulating component is at least partially displaced to the fourth position, the pressure regulating component connects the oil inlet chamber and the oil return chamber.

[0013] The pressure regulating valve connects the oil inlet chamber and the oil return chamber by reciprocating at least partially between the third and fourth positions of the pressure regulating component, so as to unload through the oil return chamber and maintain a constant pressure in the oil inlet chamber, thereby ensuring a constant pressure in the steering system.

[0014] In some embodiments, the first oil passage has a first limiting step, and when the pressure regulating component is at least partially located in the third position, a portion of the pressure regulating component abuts against the first limiting step to disconnect the oil inlet chamber and the oil return chamber.

[0015] In some embodiments, the voltage regulating component includes:

[0016] When the pressure regulating assembly is at least partially located in the third position, the valve ball abuts against the first limiting step; and

[0017] A limiting seat is slidably disposed in the first oil passage. The valve ball abuts against the end of the limiting seat near the first limiting step. When the oil pressure on the side of the first oil passage near the oil inlet chamber is higher than the first oil pressure threshold, the oil in the first oil passage can push the pressure regulating component to move towards the fourth position.

[0018] The first oil passage guides the reciprocating movement of the limit seat, thus preventing the limit seat from jamming and improving the stability of the pressure regulating component. The valve ball and limit seat have a simple structure, are easy to manufacture, and help reduce maintenance costs during the use of the pressure regulating valve.

[0019] In some embodiments, the limiting seat is clearance-fitted with the first oil passage.

[0020] The clearance fit between the limiting seat and the first oil passage facilitates the flow of oil into the return oil chamber within the gap between the limiting seat and the first oil passage, thus achieving the connection between the oil inlet chamber and the oil return chamber.

[0021] In some embodiments, the valve ball is a sphere, the limiting seat has a limiting cone surface, and the valve ball abuts against the limiting cone surface.

[0022] The limiting cone surface makes the valve ball and the limiting cone surface coaxial. The limiting cone surface can keep the valve ball on the central axis of the limiting seat, so that the valve ball seals the first oil passage when it abuts against the first limiting step.

[0023] In some embodiments, the voltage regulating component further includes:

[0024] A fixed seat is disposed in the first oil passage. The fixed seat has a connecting hole. When the limiting seat is in the fourth position, the connecting hole can connect the first oil passage and the oil return chamber.

[0025] The first reset member has two ends that abut against the limiting seat and the fixing seat respectively, and the first reset member can drive the limiting seat to move to the third position when the limiting seat is in the fourth position.

[0026] The first reset element helps to automatically reset the limit seat, ensuring that the limit seat can return to the third position after moving to the fourth position. The fixed seat supports the first reset element and the limit seat, while the connecting hole connects the oil return chamber to the first oil passage.

[0027] In some embodiments, the fixing seat is threadedly connected to the inner wall of the first oil passage to fix the fixing seat, which helps to improve the stability and reliability of the regulating oil pressure of the pressure regulating assembly.

[0028] In some embodiments, the voltage regulating component further includes:

[0029] In some embodiments, the limiting seat includes:

[0030] The subject; and

[0031] The boss is connected to one end of the body facing the fixed seat. The communicating hole has a second limiting step. One end of the first reset member is sleeved on the boss and abuts against the body. The other end of the first reset member abuts against the second limiting step.

[0032] This structure of the limiting seat helps to further improve the stability of the first reset member. When the first reset member is compressed, a portion of the boss can be compressed into the connecting hole. As long as a certain gap is maintained between the end face of the body near the boss and the end face of the fixed seat to allow the oil to flow, the function of regulating oil pressure can be maintained, and it also helps to reduce the axial dimension of the pressure regulating component.

[0033] A steering system including a pressure regulating valve as described above. Attached Figure Description

[0034] Figure 1This is a schematic diagram of the steering system provided in an embodiment of the present invention;

[0035] Figure 2 This is a cross-sectional view of the pressure regulating valve provided in this embodiment of the utility model. Figure 2 ;

[0036] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0037] Figure 4 This is a cross-sectional schematic diagram of the valve core provided in an embodiment of this utility model;

[0038] Figure 5 This is a cross-sectional schematic diagram of the fixing base provided in an embodiment of this utility model;

[0039] Figure 6 This is a cross-sectional schematic diagram of the limiting seat provided in this embodiment of the utility model.

[0040] Figure label:

[0041] 1000-Pressure regulating valve;

[0042] 100 - Valve sleeve; 110 - Receiving cavity; 111 - Oil inlet cavity; 112 - Oil return cavity;

[0043] 200 - Valve core; 210 - Pressure regulating oil passage; 211 - First oil passage; 2111 - First limit step; 212 - Second oil passage;

[0044] 300-Pressure regulating assembly; 310-Valve ball; 320-Limit seat; 321-Limit cone surface; 322-Body; 323-Boss; 330-Fixing seat; 331-Communication hole; 3311-Second limit step; 340-First reset component;

[0045] 400-plunger;

[0046] 500 - Second reset component;

[0047] 2000 - Hydraulic pump; 3000 - Filter. Detailed Implementation

[0048] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0049] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0050] like Figure 1 As shown, this utility model provides a steering system for use in construction machinery. The steering system includes a hydraulic pump 2000, a filter 3000, and a pressure regulating valve 1000 connected in sequence. The hydraulic pump 2000 supplies hydraulic fluid to the pressure regulating valve 1000, and the hydraulic fluid flows through the filter 3000 for filtration before entering the pressure regulating valve 1000.

[0051] like Figure 2As shown, this embodiment provides a pressure regulating valve 1000 for use in a steering system. The pressure regulating valve 1000 includes a valve sleeve 100 and a valve core 200. The valve sleeve 100 has a receiving cavity 110, and the valve core 200 passes through the receiving cavity 110. The valve core 200 divides the receiving cavity 110 into an oil inlet cavity 111 and an oil return cavity 112. The valve core 200 is provided with a pressure regulating oil passage 210. The valve core 200 can reciprocate between a first position and a second position in the receiving cavity 110. When the valve core 200 is in the first position, the pressure regulating oil passage 210 is connected to the oil inlet cavity 111, and the oil in the oil inlet cavity 111 flows to the pressure regulating oil passage 210. The increase in oil pressure in the pressure regulating oil passage 210 can drive the valve core 200 to move from the first position to the second position. When the valve core 200 is in the second position, the pressure regulating oil passage 210 connects the oil inlet cavity 111 and the oil return cavity 112. The initial position of the valve core 200 is in the first position. In operation, hydraulic fluid enters the inlet chamber 111 through a filter. From the inlet chamber 111, the fluid flows into the pressure regulating passage 210. As the fluid level in the inlet chamber 111 increases, the pressure in the inlet chamber 111 rises, and the fluid level in the pressure regulating passage 210 also rises accordingly. Under the influence of the hydraulic pressure, the valve core 200 moves towards the second position. When the hydraulic pressure reaches the second hydraulic pressure threshold, the valve core 200 moves to the second position. At this time, the inlet chamber 111 is connected to the return chamber 112, and the hydraulic pressure in the inlet chamber 111 can be unloaded through the return chamber 112, thereby maintaining a constant pressure in the inlet chamber 111 and ensuring a constant pressure in the steering system.

[0052] Furthermore, the pressure regulating valve 1000 also includes a plunger 400, which is disposed in the pressure regulating oil passage 210 and located at the end of the pressure regulating oil passage 210 away from the return oil chamber 112. The plunger 400 and the valve core 200 work together to form a sealed cavity at the end of the pressure regulating oil passage 210 away from the return oil chamber 112, which helps to prevent oil leakage.

[0053] Optionally, the pressure regulating valve 1000 further includes a second reset member 500, which is disposed near the center of the receiving cavity 110, and whose two ends abut against the valve core 200 and the valve sleeve 100, respectively. The second reset member 500 can return to the first position when the valve core 200 is in the second position.

[0054] Please see Figure 2 and Figure 3As an optional solution, the pressure regulating valve 1000 also includes a pressure regulating assembly 300. The pressure regulating assembly 300 is disposed in the pressure regulating oil passage 210. The pressure regulating assembly 300 can disconnect or connect the inlet chamber 111 and the return chamber 112 when the valve core 200 is stuck. This pressure regulating assembly 300 can connect the inlet chamber 111 and the return chamber 112 when the valve core 200 is stuck and cannot move within the receiving chamber 110, allowing the oil pressure in the inlet chamber 111 to be unloaded through the return chamber 112, thereby maintaining a constant pressure in the inlet chamber 111, ensuring constant steering system pressure, and improving the safety of the pressure regulating valve 1000. This pressure regulating assembly 300 prevents excessive pressure in the inlet chamber 111, which helps ensure the pressure regulating function of the valve core 200, improves the safety performance of the pressure regulating valve 1000, and thus prevents the steering system filter from bursting.

[0055] In some embodiments, such as Figures 2-4 As shown, the pressure regulating oil passage 210 includes a first oil passage 211 and a second oil passage 212. The first oil passage 211 extends axially along the valve core 200, and the second oil passage 212 connects the first oil passage 211 and the oil inlet chamber 111. The pressure regulating assembly 300 can reciprocate between a third position and a fourth position, at least partially, in the first oil passage 211. When the pressure regulating assembly 300 is at least partially in the third position, it disconnects the oil inlet chamber 111 and the oil return chamber 112. When the pressure regulating assembly 300 is at least partially in the fourth position, it connects the oil inlet chamber 111 and the oil return chamber 112. The pressure regulating valve 1000 achieves the connection between the oil inlet chamber 111 and the oil return chamber 112 by reciprocating between the pressure regulating assembly 300 at least partially and the third position, so as to unload through the oil return chamber 112, thereby maintaining a constant pressure in the oil inlet chamber 111 and ensuring a constant steering system pressure.

[0056] Furthermore, the first oil passage 211 has a first limiting step 2111. When the pressure regulating component 300 is at least partially in the third position, a portion of the pressure regulating component 300 abuts against the first limiting step 2111 to disconnect the oil inlet chamber 111 and the oil return chamber 112. When the valve core 200 is not stuck, the pressure regulating valve 1000 can achieve the abutment of the first limiting step 2111 against the pressure regulating component 300 when the oil pressure in the oil inlet chamber 111 is within a certain range, so as to ensure that the valve core 200 can reciprocate between the first position and the second position, thereby ensuring the pressure regulating valve 1000's function of regulating pressure.

[0057] like Figure 2 , Figure 3As shown, in some embodiments, the pressure regulating assembly 300 includes a valve ball 310 and a limiting seat 320. When the pressure regulating assembly 300 is at least partially in the third position, the valve ball 310 abuts against the first limiting step 2111, and the limiting seat 320 is slidably disposed in the first oil passage 211. The valve ball 310 abuts against the end of the limiting seat 320 near the first limiting step 2111. When the oil pressure on the side of the first oil passage 211 near the oil inlet chamber 111 is higher than the first oil pressure threshold, the oil in the first oil passage 211 can push the pressure regulating assembly to move towards the fourth position. The first oil passage 211 guides the reciprocating movement of the limiting seat 320, thereby preventing the limiting seat 320 from getting stuck and improving the stability of the pressure regulating function of the pressure regulating assembly 300. The valve ball 310 and the limiting seat 320 have a simple structure, are easy to manufacture, and help reduce the maintenance cost of the pressure regulating valve 1000 during use.

[0058] Furthermore, the valve ball 310 is a sphere, and the sphere structure abuts against the first limiting step 2111. The outer circumferential surface of the ball abuts against the first limiting step 2111, preventing oil from overflowing from the gap between the valve ball 310 and the first limiting step 2111. Simultaneously, the sphere structure is adaptable to any first limiting step 2111 with a diameter smaller than the ball's diameter, which helps to improve the applicability of the pressure regulating assembly 300.

[0059] Furthermore, the diameter of the valve ball 310 is greater than the minimum diameter of the first limiting step 2111, and the diameter of the valve ball 310 is smaller than the larger diameter at the first limiting step 2111, thereby enabling the valve ball 310 to move flexibly.

[0060] In some embodiments, the limiting seat 320 is clearance-fitted with the first oil passage 211 so that the oil can flow into the return oil chamber 112 in the gap between the limiting seat 320 and the first oil passage 211, thereby realizing the communication between the oil inlet chamber 111 and the return oil chamber 112.

[0061] Optionally, the limiting seat 320 has a limiting cone surface 321, and the valve ball 310 abuts against the limiting cone surface 321, so that the valve ball 310 and the limiting cone surface 321 are coaxially arranged. The limiting cone surface 321 can keep the valve ball 310 on the central axis of the limiting seat 320, thereby making the valve ball 310 seal the first oil passage 211 when it abuts against the first limiting step 2111.

[0062] In addition, such as Figure 3 and Figure 5As shown, the pressure regulating assembly 300 also includes a fixed base 330 and a first reset member 340. The fixed base 330 is disposed in the first oil passage 211 and has a connecting hole 331. When the limiting seat 320 is in the fourth position, the connecting hole 331 can connect the first oil passage 211 and the return oil chamber 112. The two ends of the first reset member 340 abut against the limiting seat 320 and the fixed base 330 respectively. The first reset member 340 can drive the limiting seat 320 to move to the third position when the limiting seat 320 is in the fourth position. The first reset member 340 helps to realize the automatic reset of the limiting seat 320, so as to ensure that the limiting seat 320 can return to the third position after moving to the fourth position. The fixed base 330 provides support for the first reset member 340 and the limiting seat 320, while the connecting hole 331 is used to connect the return oil chamber 112 and the first oil passage 211.

[0063] The fixed seat 330 is threaded to the inner wall of the first oil passage 211 to fix the fixed seat 330, which helps to improve the stability and reliability of the regulating oil pressure of the pressure regulating component 300.

[0064] like Figure 3 and Figure 6 As shown, the limiting seat 320 includes a body 322 and a boss 323. The boss 323 is connected to one end of the body 322 facing the fixed seat 330. The connecting hole 331 has a second limiting step 3311. One end of the first reset member 340 is sleeved on the boss 323 and abuts against the body 322. The other end of the first reset member 340 abuts against the second limiting step 3311. This structure of the limiting seat 320 is beneficial to further improve the stability of the first reset member 340.

[0065] When the first reset member 340 is compressed, a portion of the boss 323 can be compressed into the connecting hole 331. As long as a certain gap is maintained between the end face of the body 322 near the boss 323 and the end face of the fixed seat 330 to allow the oil to flow, the function of regulating oil pressure can be maintained, which is also beneficial to reduce the axial dimension of the pressure regulating component 300.

[0066] The working process of pressure regulating valve 1000 will now be explained with reference to the diagram.

[0067] When the valve core 200 is working normally, its initial position is in the first position. Oil flows into the inlet chamber 111, then through the second oil passage 212, and then into the pressure regulating oil passage 210 located at the end of the valve core 200 where the plunger 400 is located. When the oil pressure increases to the second oil pressure threshold, the valve core 200 moves to the second position under the action of the oil pressure.

[0068] The initial positions of the valve ball 310 and the limiting seat 320 are in the third position. When the valve core 200 becomes stuck, and the oil pressure in the first oil passage 211 is higher than the first oil pressure threshold, the oil pressure pushes the valve ball 310 and the limiting seat 320 from the third position to the fourth position, causing the valve ball 310 to separate from the first limiting step 2111. The oil in the first oil passage 211 can flow through the gap between the valve ball 310 and the first limiting step 2111, and the gap between the limiting seat 320 and the pressure regulating oil passage 210, into the communicating hole 331 of the fixed seat 330, and then flow into the return oil chamber 112 to achieve an unloading effect. After the oil pressure is regulated, the first reset member 340 can push the limiting seat 320 to reset to the third position, thereby driving the valve ball 310 to reset.

[0069] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0072] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0073] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0074] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pressure regulating valve, characterized in that, include: A valve sleeve having a receiving cavity; A valve core is disposed within the accommodating cavity, dividing the accommodating cavity into an oil inlet chamber and an oil return chamber. The valve core has a pressure regulating oil passage. The valve core can reciprocate between a first position and a second position within the accommodating cavity. When the valve core is in the first position, the pressure regulating oil passage is connected to the oil inlet chamber, and oil flows from the oil inlet chamber to the pressure regulating oil passage. The increased oil pressure in the pressure regulating oil passage can drive the valve core to move from the first position to the second position. When the valve core is in the second position, the pressure regulating oil passage connects the oil inlet chamber and the oil return chamber. as well as A pressure regulating component is disposed in the pressure regulating oil passage. The pressure regulating component can disconnect or connect the oil inlet chamber and the oil return chamber when the valve core is stuck.

2. The pressure regulating valve according to claim 1, characterized in that, The pressure regulating oil passage includes a first oil passage and a second oil passage. The first oil passage extends along the axial direction of the valve core, and the second oil passage connects the first oil passage and the oil inlet chamber. The pressure regulating component can reciprocate between a third position and a fourth position at least partially in the first oil passage. When the pressure regulating component is at least partially displaced to the third position, the pressure regulating component disconnects the oil inlet chamber and the oil return chamber; When the pressure regulating component is at least partially displaced to the fourth position, the pressure regulating component connects the oil inlet chamber and the oil return chamber.

3. The pressure regulating valve according to claim 2, characterized in that, The first oil passage has a first limiting step. When the pressure regulating component is at least partially located in the third position, a portion of the pressure regulating component abuts against the first limiting step to disconnect the oil inlet chamber and the oil return chamber.

4. The pressure regulating valve according to claim 3, characterized in that, The voltage regulating component includes: When the pressure regulating assembly is at least partially located in the third position, the valve ball abuts against the first limiting step; and A limiting seat is slidably disposed in the first oil passage. The valve ball abuts against the end of the limiting seat near the first limiting step. When the oil pressure on the side of the first oil passage near the oil inlet chamber is higher than the first oil pressure threshold, the oil in the first oil passage can push the pressure regulating component to move towards the fourth position.

5. The pressure regulating valve according to claim 4, characterized in that, The limiting seat is clearance-fitted with the first oil passage.

6. The pressure regulating valve according to claim 4, characterized in that, The valve ball is a sphere, and the limiting seat has a limiting cone surface, with the valve ball abutting against the limiting cone surface.

7. The pressure regulating valve according to claim 4, characterized in that, The voltage regulating component also includes: A fixing seat, wherein the fixing seat is disposed in the first oil passage, the fixing seat having a communicating hole, and when the limiting seat is in the fourth position, the communicating hole can connect the first oil passage and the return oil chamber; and The first reset member has two ends that abut against the limiting seat and the fixing seat respectively, and the first reset member can drive the limiting seat to move to the third position when the limiting seat is in the fourth position.

8. The pressure regulating valve according to claim 7, characterized in that, The fixed seat is threadedly connected to the inner wall of the first oil passage.

9. The pressure regulating valve according to claim 7, characterized in that, The limiting seat includes: The subject; and The boss is connected to one end of the body facing the fixed seat. The communicating hole has a second limiting step. One end of the first reset member is sleeved on the boss and abuts against the body. The other end of the first reset member abuts against the second limiting step.

10. A steering system, characterized in that, Including the pressure regulating valve as described in any one of claims 1-9.

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