Hydraulic circuit, hydraulic suspension and vehicle

Abstract

This application relates to the field of vehicle chassis technology and provides an oil circuit system, a hydraulic suspension, and a vehicle. The oil circuit system of this application includes an external solenoid valve and several oil circuits flowing through the external solenoid valve. Each oil circuit connects an oil supply device and a shock absorber, and each oil circuit is equipped with a control unit to allow oil from the oil supply device to flow unidirectionally to the shock absorber via one oil circuit, and oil in the shock absorber to flow unidirectionally to the oil supply device via another oil circuit. The oil circuit system of this application, by using an external solenoid valve in conjunction with the control unit, allows oil to flow unidirectionally from the oil supply device to the shock absorber via one oil circuit, and oil to flow unidirectionally from the shock absorber to the oil supply device via another oil circuit, satisfying the requirement for bidirectional oil flow. Furthermore, due to the use of an external solenoid valve that allows only unidirectional oil flow, the oil pressure adjustment range at both the recovery and compression ends is relatively wide.

Description

Technical Field

[0001] This application relates to the field of vehicle chassis technology, and in particular to an oil circuit system. This application also relates to a hydraulic suspension using the oil circuit system, and a vehicle using the hydraulic suspension. Background Technology

[0002] Existing hydraulic suspensions typically have an oil circuit system between the oil supply device and the shock absorber to meet the oil flow requirements between the two.

[0003] Solenoid valves are typically installed in hydraulic systems to provide damping adjustment. Commonly used solenoid valves include external and internal types. External solenoid valves allow hydraulic fluid to flow in from only one end and out from the designated port, preventing reverse flow. Because external solenoid valves use the same hydraulic circuit on both the compression end (the end with the damper) and the recovery end (the end with the oil supply device), they offer a wider adjustable range of hydraulic pressure, especially on the compression end. While internal solenoid valves allow bidirectional flow, due to the different hydraulic circuit, their adjustment range is generally higher on the recovery end and lower on the compression end. Utility Model Content

[0004] In view of this, this application aims to propose an oil circuit system that is suitable for hydraulic suspension and has good performance.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] An oil circuit system, suitable for hydraulic suspension and connected between an oil supply device and a shock absorber, includes an external solenoid valve and a plurality of oil passages flowing through the external solenoid valve.

[0007] Each of the oil circuits can connect the oil supply device and the shock absorber, and each of the oil circuits is equipped with a control unit;

[0008] Under the control of the control unit, the oil in the oil supply device can flow unidirectionally to the shock absorber through one of its oil circuits and the external solenoid valve, and the oil in the shock absorber can flow unidirectionally to the oil supply device through the other oil circuit and the external solenoid valve.

[0009] Furthermore, several of the oil circuits include a first branch oil inlet circuit connected between the oil supply device and the external solenoid valve, a second branch oil inlet circuit connected between the external solenoid valve and the shock absorber, a first branch oil outlet circuit connected between the shock absorber and the external solenoid valve, and a second branch oil outlet circuit connected between the external solenoid valve and the oil supply device.

[0010] The control unit is provided on the first branch oil inlet circuit, the second branch oil inlet circuit, the first branch oil outlet circuit, and the second branch oil outlet circuit.

[0011] Furthermore, the ends of the first branch oil inlet circuit and the second branch oil outlet circuit connected to the oil supply device are connected in parallel through the first oil inlet and outlet pipe;

[0012] The second branch oil inlet circuit and the first branch oil outlet circuit are connected to the shock absorber at one end through a second oil inlet / outlet pipe.

[0013] Furthermore, the first branch oil inlet circuit and the first branch oil outlet circuit are connected to the external solenoid valve at one end through a third oil inlet / outlet pipe.

[0014] The second branch oil inlet and the second branch oil outlet are connected to the external solenoid valve at one end through the fourth oil inlet and outlet pipe.

[0015] Furthermore, the first branch oil inlet circuit has a first branch oil inlet section connected between the first oil inlet / outlet pipe and the third oil inlet / outlet pipe, and the second branch oil inlet circuit has a second branch oil inlet section connected between the fourth oil inlet / outlet pipe and the second oil inlet / outlet pipe.

[0016] The first branch oil outlet circuit has a first branch oil outlet section connected between the second oil inlet / outlet pipe and the third oil inlet / outlet pipe; the second branch oil outlet circuit has a second branch oil outlet section connected between the fourth oil inlet / outlet pipe and the first oil inlet / outlet pipe;

[0017] The control unit is provided on the first branch oil inlet section, the second branch oil inlet section, the first branch oil outlet section, and the second branch oil outlet section.

[0018] Furthermore, the control units on the first branch oil inlet section, the second branch oil inlet section, the first branch oil outlet section, and the second branch oil outlet section all include one-way valves.

[0019] Furthermore, it also includes a first accumulator, which is connected to the first oil inlet / outlet pipe.

[0020] Furthermore, it also includes a second accumulator, which is connected to the second oil inlet / outlet pipe.

[0021] Compared with the prior art, this application has the following advantages:

[0022] (1) The oil circuit system described in this application, by using an external solenoid valve in conjunction with the control unit, allows the oil self-supply device to flow unidirectionally to the damper through one oil circuit, and allows the oil self-damper to flow unidirectionally to the oil supply device through another oil circuit, thus meeting the requirement of bidirectional oil flow. Furthermore, by using an external solenoid valve that can only flow oil in one direction, the oil pressure adjustment range of the recovery end (the end with the oil supply device) and the compression end (the end with the damper) is relatively wide.

[0023] (2) The external solenoid valve is a key control element. It is directly connected to the oil supply device through the first branch oil inlet circuit and the second branch oil outlet circuit. At the same time, the second branch oil inlet circuit and the first branch oil outlet circuit are directly connected to the external solenoid valve and the shock absorber. It is convenient to use the external solenoid valve, which can only flow oil in one direction, to realize bidirectional oil flow between the oil supply device and the shock absorber. The control part is distributed on each oil circuit, and the control accuracy is high.

[0024] (3) The first branch oil inlet and the second branch oil outlet are connected to the oil supply device at one end through the first oil inlet and outlet pipe, and the second branch oil inlet and the first branch oil outlet are connected to the shock absorber at one end through the second oil inlet and outlet pipe. This makes the pipeline structure simple, easy to arrange, and convenient to connect to the oil supply device and the shock absorber respectively.

[0025] (4) The first branch oil inlet and the first branch oil outlet are connected to the external solenoid valve at one end through the third oil inlet and outlet pipe, and the second branch oil inlet and the second branch oil outlet are connected to the external solenoid valve at one end through the fourth oil inlet and outlet pipe. This makes the pipeline structure simple, easy to arrange, and convenient to connect with the external solenoid valve.

[0026] (5) Set up a first branch oil inlet section, a second branch oil inlet section, a first branch oil outlet section and a second branch oil outlet section, and set up control units on these pipelines respectively, so as to facilitate the opening and closing of the first branch oil inlet oil circuit, the second branch oil inlet oil circuit, the first branch oil outlet oil circuit and the second branch oil outlet oil circuit respectively, so as to facilitate the unidirectional flow of oil from the oil supply device to the shock absorber through the first branch oil inlet oil circuit and the second branch oil inlet oil circuit, and to realize the unidirectional flow of oil in the shock absorber to the oil supply device through the first branch oil outlet oil circuit and the second branch oil outlet oil circuit.

[0027] (6) The control units on the first branch oil inlet section, the second branch oil inlet section, the first branch oil outlet section, and the second branch oil outlet section all include check valves, which allow the oil to flow in one direction while preventing it from flowing in the opposite direction. This ensures that the oil is transmitted in the predetermined direction. Moreover, the check valve has a relatively simple structure, small size, and is easy to install and integrate into the oil circuit. Using check valves can reduce the dependence on other complex control components, thereby simplifying the design and layout of the oil circuit system. Check valves can also play a certain protective role when abnormal conditions occur in the oil circuit (such as pressure changes or leakage), preventing the oil from flowing uncontrollably, thereby improving safety performance.

[0028] (7) A first accumulator is installed. When the pressure in the first oil inlet / outlet pipe exceeds the preset charging pressure of the first accumulator, the oil will be forced into the first accumulator, converting the hydraulic energy into the internal energy of the gas for storage. When the pressure in the first oil inlet / outlet pipe is lower than the preset charging pressure of the first accumulator, the oil in the first accumulator can flow back to the first oil inlet / outlet pipe, which helps to ensure the safe operation of the oil circuit system. In addition, the first accumulator can also realize the function of oil-gas separation. It can compensate for the change in oil volume caused by the movement of the shock absorber piston rod, and can also cooperate with the oil supply device such as the oil pump to adjust the oil pressure and realize hydraulic lifting.

[0029] (8) A second accumulator is provided. When the pressure in the second oil inlet and outlet pipe exceeds the preset charging pressure of the second accumulator, the oil will be forced into the second accumulator to convert the hydraulic energy into the internal energy of the gas for storage. When the pressure in the second oil inlet and outlet pipe is lower than the preset charging pressure of the second accumulator, the oil in the second accumulator can flow back to the second oil inlet and outlet pipe, which is conducive to ensuring the safe operation of the oil circuit system.

[0030] Another object of this application is to provide a hydraulic suspension, including a shock absorber, an oil supply device for supplying oil to the shock absorber, and an oil circuit system as described above connected between the oil supply device and the shock absorber.

[0031] The hydraulic suspension described in this application, by applying the above-mentioned oil circuit system, meets the requirement of bidirectional oil flow between the oil supply device and the shock absorber. Furthermore, by utilizing an external solenoid valve that can only flow oil in one direction, the oil pressure adjustment range of the recovery end and the compression end is wider, thereby improving the damping adjustment range of the hydraulic suspension.

[0032] Furthermore, another object of this application is to provide a vehicle equipped with the hydraulic suspension described above.

[0033] The vehicle described in this application, by applying the hydraulic suspension as described above and utilizing the oil circuit system as described above to achieve bidirectional flow of oil between the oil supply device and the shock absorber, allows for a wider range of oil pressure adjustment between the recovery end and the compression end, thereby improving the vehicle's performance and quality. Attached Figure Description

[0034] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0035] Figure 1 This is an exemplary structural diagram of the oil circuit system under the application state described in the embodiments of this application;

[0036] Figure 2 This is an exemplary structural diagram of the oil circuit system described in an embodiment of this application;

[0037] Figure 3 for Figure 1 Enlarged view of part A;

[0038] Figure 4 This is an exemplary structural diagram of the connection between the oil circuit system and the shock absorber described in the embodiments of this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] A. Oil circuit system;

[0041] 1. External solenoid valve; 2. Oil supply device; 3. Vibration damper;

[0042] 201. Fuel supply unit; 202. Control unit;

[0043] 401. First branch oil inlet section; 402. Second branch oil inlet section;

[0044] 501. First branch oil outlet section; 502. Second branch oil outlet section;

[0045] 601. First oil inlet / outlet pipe; 602. Second oil inlet / outlet pipe; 603. Third oil inlet / outlet pipe; 604. Fourth oil inlet / outlet pipe;

[0046] 701. First check valve; 702. Second check valve; 703. Third check valve; 704. Fourth check valve;

[0047] 801, First accumulator; 802, Second accumulator. Detailed Implementation

[0048] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0050] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not 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 on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0052] In this application, 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 application. 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.

[0053] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0054] In related technologies, with the continuous upgrading of automotive suspension technology, the development of intelligent suspension, such as air suspension and hydraulic suspension, has received increasing attention. Among them, air suspension, as a height-adjustable suspension, has experienced rapid development in recent years. Air suspension is low-cost and lightweight, and has been applied to many vehicles. Although air suspension has many advantages, its characteristics also determine that it is not suitable for MacPherson strut suspension and strong off-road vehicles. Especially in the application of strong off-road vehicles, the industry mostly uses the more reliable hydraulic suspension.

[0055] A complete hydraulic suspension system consists of an electro-hydraulic pump, valve assembly, several accumulators, damping adjustment devices, shock absorbers, and springs. The hydraulic suspension is filled with hydraulic oil. When the suspension needs to be raised, the electro-hydraulic pump supplies oil to the valve assembly, controlling the flow of oil to designated shock absorbers and accumulators by opening and closing solenoid valves within the valve assembly. This increases the system pressure, controlling the vehicle's ascent. When the vehicle needs to be lowered, the solenoid valves open, releasing the system pressure. Under the vehicle's own weight, the oil from the shock absorbers is pumped back to the electro-hydraulic pump.

[0056] When the shock absorber piston reciprocates, the hydraulic fluid generates damping force, thus dissipating elastic potential energy. The damping force of the shock absorber needs to be adjusted and matched in conjunction with the piston speed during design. If the damping force is too high, the spring decay time is short, resulting in better vehicle posture control during aggressive driving such as sharp turns and sudden braking, which is beneficial to vehicle handling. However, the overall suspension is too stiff, and passengers experience stronger impacts when driving over bumpy roads, which is detrimental to ride comfort. Conversely, if the damping force is too low, ride comfort is good, but handling is poor. Generally speaking, the shock absorber damping needs to be adjusted according to the style of the vehicle being matched, striking a balance between comfort and handling.

[0057] To balance comfort and handling, hydraulic suspensions are generally equipped with damping adjustment devices, which are usually separate from electronically controlled shock absorbers. These devices can adjust the damping force of the shock absorbers via electrical signals, thereby reducing impact when driving over bumpy roads and improving vehicle handling during aggressive driving.

[0058] In related technologies, a damping adjustment device suitable for hydraulic suspension is a continuously adjustable solenoid valve, which is configured with a valve system containing back pressure valve plates in both the compression and recovery directions of the corresponding shock absorber.

[0059] Existing hydraulic suspension damping adjustment devices differ in design from conventional electronically controlled shock absorber solenoid valves. Conventional electronically controlled shock absorber solenoid valves come in two types, external and internal, depending on their installation location. External solenoid valves allow hydraulic fluid to flow in from only one end and out from the designated port, preventing reverse flow. However, because external solenoid valves use the same oil circuit on both the compression and recovery ends, they offer a wider adjustable oil pressure range, especially on the compression end. Internal solenoid valves allow bidirectional oil flow, but due to the different oil circuit, their adjustment range is generally higher on the recovery end and lower on the compression end.

[0060] To address the above issues, developing new solenoid valves would require significant R&D and validation investment; therefore, existing solenoid valves limit the application of hydraulic suspension systems.

[0061] Since the oil must pass through an external solenoid valve to achieve damping adjustment, in order to reduce the impact of the external solenoid valve on the hydraulic suspension, the first aspect of this application provides an oil circuit system A, which is applied to the hydraulic suspension system of a vehicle. It is mainly used for oil flow between the oil supply device and the shock absorber. Furthermore, the oil circuit system A of this embodiment, with its innovative structural design, can meet the requirements of bidirectional oil flow while enabling both the recovery end and the compression end to have a large oil pressure adjustment range.

[0062] Reference Figures 1 to 3 As shown, the oil circuit system A of this embodiment is suitable for hydraulic suspension and is connected between the oil supply device 2 and the shock absorber 3. The oil circuit system A mainly includes an external solenoid valve 1 and several oil circuits flowing through the external solenoid valve 1.

[0063] In terms of overall structure, each oil circuit can connect the oil supply device 2 and the shock absorber 3, and each oil circuit is equipped with a control unit. Under the control of each control unit, the oil in the oil supply device 2 can flow unidirectionally to the shock absorber 3 through one oil circuit and the external solenoid valve 1, and the oil in the shock absorber 3 can flow unidirectionally to the oil supply device 2 through another oil circuit and the external solenoid valve 1.

[0064] The oil circuit system A of this application, by using an external solenoid valve 1 in cooperation with the control unit, allows the oil self-supply device 2 to flow unidirectionally to the damper 3 through one oil circuit, and allows the oil self-dampening device 3 to flow unidirectionally to the oil supply device 2 through another oil circuit, thus meeting the requirement of bidirectional oil flow. Furthermore, since the oil circuit system A utilizes the external solenoid valve 1 which can only flow oil in one direction, the oil pressure adjustment range of the recovery end and the compression end is relatively wide.

[0065] In some of these exemplary implementations, reference is still made to... Figure 2 and Figure 3 As shown, the oil circuits include a first branch oil inlet circuit connected between the oil supply device 2 and the external solenoid valve 1, a second branch oil inlet circuit connected between the external solenoid valve 1 and the shock absorber 3, a first branch oil outlet circuit connected between the shock absorber 3 and the external solenoid valve 1, and a second branch oil outlet circuit connected between the external solenoid valve 1 and the oil supply device 2. Furthermore, a control unit is provided on the first branch oil inlet circuit, the second branch oil inlet circuit, the first branch oil outlet circuit, and the second branch oil outlet circuit.

[0066] It is worth noting that, in specific implementation, the external solenoid valve 1, as a key control element, is directly connected to the oil supply device 2 through the first branch oil inlet circuit and the second branch oil outlet circuit. At the same time, the second branch oil inlet circuit and the first branch oil outlet circuit are directly connected to the external solenoid valve 1 and the shock absorber 3, which facilitates the bidirectional oil flow between the oil supply device 2 and the shock absorber 3 by using the external solenoid valve 1, which can only flow oil in one direction. The control part is distributed on each oil circuit, resulting in high control accuracy.

[0067] like Figure 2 and Figure 3 As shown, in some exemplary embodiments, the ends of the first branch oil inlet circuit and the second branch oil outlet circuit connected to the oil supply device 2 are connected in parallel through the first oil inlet / outlet pipe 601, and the ends of the second branch oil inlet circuit and the first branch oil outlet circuit connected to the shock absorber 3 are connected in parallel through the second oil inlet / outlet pipe 602.

[0068] In the above structure, the first branch oil inlet circuit and the second branch oil outlet circuit are connected to the oil supply device 2 at one end through the first oil inlet / outlet pipe 601, so that the first branch oil inlet circuit and the second branch oil outlet circuit can be connected to the oil supply device 2 through only one pipe, the first oil inlet / outlet pipe 601, which makes the connection relatively simple.

[0069] In addition, the ends of the second branch oil inlet circuit and the first branch oil outlet circuit connected to the shock absorber 3 are connected in parallel through the second oil inlet / outlet pipe 602, so that the second branch oil inlet circuit and the first branch oil outlet circuit can be connected to the shock absorber 3 through only one pipe, the second oil inlet / outlet pipe 602, which makes the connection relatively simple.

[0070] As can be seen from the above introduction, the first oil inlet / outlet pipe 601 and the second oil inlet / outlet pipe 602 can both make the pipeline structure simple, easy to arrange, and convenient to connect to the oil supply device 2 and the shock absorber 3 respectively.

[0071] Continue to refer to Figure 2 and Figure 3 As shown, in some exemplary embodiments, the ends of the first branch oil inlet and outlet oil passages connected to the external solenoid valve 1 are connected in parallel via a third oil inlet / outlet pipe 603. The ends of the second branch oil inlet and outlet oil passages connected to the external solenoid valve 1 are connected in parallel via a fourth oil inlet / outlet pipe 604.

[0072] It is worth noting that, in order to simplify the oil circuit structure, the first branch oil inlet circuit and the first branch oil outlet circuit are connected to the external solenoid valve 1 at one end through the third oil inlet / outlet pipe 603. This makes the first branch oil inlet circuit and the first branch oil outlet circuit connected to the external solenoid valve 1 through only one pipe, the third oil inlet / outlet pipe 603.

[0073] The second branch oil inlet and the second branch oil outlet are connected to the external solenoid valve 1 at one end through the fourth oil inlet / outlet pipe 604, so that the second branch oil inlet and the second branch oil outlet share the fourth oil inlet / outlet pipe 604 to be connected to the external solenoid valve 1, which can also simplify the structure of oil circuit system A.

[0074] Based on the above analysis, it can be seen that the setting of the third oil inlet / outlet pipe 603 and the fourth oil inlet / outlet pipe 604 both make the pipeline structure simple, easy to arrange, and convenient to connect with the external solenoid valve 1.

[0075] It is worth noting that, in specific implementation, in order to achieve the requirement of bidirectional oil flow between the shock absorber 3 and the oil supply device 2, the following should be continued... Figure 2 and Figure 3 As shown, in some exemplary embodiments, the first branch oil inlet circuit has a first branch oil inlet section 401 connected between the first oil inlet / outlet pipe 601 and the third oil inlet / outlet pipe 603, and the second branch oil inlet circuit has a second branch oil inlet section 402 connected between the fourth oil inlet / outlet pipe 604 and the second oil inlet / outlet pipe 602.

[0076] The first branch oil outlet circuit has a first branch oil outlet section 501 connected between the second oil inlet / outlet pipe 602 and the third oil inlet / outlet pipe 603, and the second branch oil outlet circuit has a second branch oil outlet section 502 connected between the fourth oil inlet / outlet pipe 604 and the first oil inlet / outlet pipe 601.

[0077] The above structure is configured such that the first branch oil inlet route is formed by sequentially connecting the first oil inlet / outlet pipe 601, the first branch oil inlet section 401 and the third oil inlet / outlet pipe 603, and the second branch oil inlet route is formed by sequentially connecting the fourth oil inlet / outlet pipe 604, the second branch oil inlet section 402 and the second oil inlet / outlet pipe 602.

[0078] The first branch oil outlet route is formed by sequentially connecting the second oil inlet / outlet pipe 602, the first branch oil outlet section 501, and the fourth oil inlet / outlet pipe 604. The second branch oil outlet route is formed by sequentially connecting the fourth oil inlet / outlet pipe 604, the second branch oil outlet section 502, and the first oil inlet / outlet pipe 601.

[0079] It is worth noting that control units are provided on the first branch oil inlet section 401, the second branch oil inlet section 402, the first branch oil outlet section 501, and the second branch oil outlet section 502. Here, the first branch oil inlet section 401, the second branch oil inlet section 402, the first branch oil outlet section 501, and the second branch oil outlet section 502 are provided, and control units are installed on these pipelines respectively to facilitate the control of the opening and closing of the first branch oil inlet circuit, the second branch oil inlet circuit, the first branch oil outlet circuit, and the second branch oil outlet circuit. This facilitates the unidirectional flow of oil from the oil supply device 2 to the shock absorber 3 through the first branch oil inlet circuit and the second branch oil inlet circuit, and also allows the oil in the shock absorber 3 to flow unidirectionally to the oil supply device 2 through the first branch oil outlet circuit and the second branch oil outlet circuit.

[0080] It is worth noting that, in specific implementation, the following should still be referenced. Figure 2 and Figure 3As shown, in some exemplary embodiments, the control units on the first branch oil inlet section 401, the second branch oil inlet section 402, the first branch oil outlet section 501, and the second branch oil outlet section 502 all include one-way valves.

[0081] At this point, it is understandable that designating the control units on the first branch inlet section 401, the second branch inlet section 402, the first branch outlet section 501, and the second branch outlet section 502 as one-way valves allows the oil to flow in one direction while preventing reverse flow. This ensures that the oil is transmitted in the predetermined direction. Furthermore, the one-way valve has a relatively simple structure, small size, and is easy to install and integrate into the oil circuit. Using one-way valves reduces reliance on other complex control components, thereby simplifying the design and layout of the oil circuit system A. The one-way valve can also provide some protection in case of abnormal conditions in the oil circuit (such as sudden pressure changes or leaks), preventing uncontrolled oil flow and thus improving safety performance.

[0082] To better understand the oil circuit system A in this embodiment, the check valve on the first branch inlet section 401 is referred to as the first check valve 701, the check valve on the second branch inlet section 402 is referred to as the second check valve 702, the check valve on the first branch outlet section 501 is referred to as the third check valve 703, and the check valve on the second branch outlet section 502 is referred to as the fourth check valve 704.

[0083] The first check valve 701 controls the oil from the oil supply device 2 to flow unidirectionally to the external solenoid valve 1 via the first branch inlet oil passage. The second check valve 702 controls the oil from the external solenoid valve 1 to flow unidirectionally to the working oil chamber of the shock absorber 3 via the first branch inlet oil passage. The third check valve 703 controls the oil from the working oil chamber of the shock absorber 3 to flow unidirectionally to the external solenoid valve 1 via the first branch outlet oil passage. The fourth check valve 704 controls the oil from the external solenoid valve 1 to flow unidirectionally to the oil supply device 2 via the second branch outlet oil passage.

[0084] like Figure 3 As shown, in some exemplary embodiments, a first accumulator 801 is also included, which is connected to a first oil inlet / outlet pipe 601. The first accumulator 801 is provided here so that when the pressure inside the first oil inlet / outlet pipe 601 exceeds a preset charging pressure, oil is forced into the first accumulator 801, converting hydraulic energy into the internal energy of gas for storage. When the pressure inside the first oil inlet / outlet pipe 601 is lower than the preset charging pressure, the oil in the first accumulator 801 can flow back into the first oil inlet / outlet pipe 601, which helps ensure the safe operation of the oil circuit system A.

[0085] Continue to refer to Figure 3The structure shown, in some exemplary embodiments, further includes a second accumulator 802, which is connected to the second oil inlet / outlet pipe 602. When the pressure inside the second oil inlet / outlet pipe 602 exceeds a preset charging pressure, oil is forced into the second accumulator 802, converting hydraulic energy into the internal energy of the gas for storage. When the pressure inside the second oil inlet / outlet pipe 602 is lower than the preset charging pressure, the oil in the second accumulator 802 can flow back into the second oil inlet / outlet pipe 602, thus ensuring the safe operation of the oil circuit system A.

[0086] It should be noted that the external solenoid valve 1 and the four check valves in this embodiment can be integrated into one module or arranged separately.

[0087] Furthermore, each check valve in this embodiment can be replaced with a solenoid directional valve. However, the function and role of each directional valve are the same as those of the aforementioned check valves, controlling the oil to flow in the unidirectional direction described above. However, using a directional valve requires real-time adjustment of the solenoid directional valve's state according to the vibration damper 3's movement direction, which increases software requirements and system energy consumption.

[0088] The oil circuit system A mentioned earlier, which uses four one-way valves, does not require the intervention of an electric device and can automatically switch directions according to the oil flow direction. The system is safe, reliable, and energy-saving.

[0089] It should be noted that the first accumulator 801 operates normally, while the second accumulator 802 only operates under specific conditions. In a preferred example, the first accumulator 801 is a low-voltage accumulator, while the second accumulator 802 is a high-voltage accumulator. For specific application details, please refer to the description in the relevant prior art.

[0090] Reference Figure 4 As shown, the first accumulator 801 is disposed between the oil supply device 2 and the fourth check valve 704. Specifically, the connection between the first accumulator 801 and the first oil inlet / outlet pipe 601 is located between the oil outlet of the oil supply device 2 and the liquid outlet of the fourth check valve 704.

[0091] The second accumulator 802 is disposed between the third check valve 703 and the shock absorber 3. Specifically, the connection between the second accumulator 802 and the second oil inlet / outlet pipe 602 is located between the oil inlet / outlet of the shock absorber 3 and the liquid inlet of the third check valve 703.

[0092] In view of this, in order to overcome the shortcomings of the prior art, in the oil circuit system A of this embodiment, combined with Figures 2 to 4 As shown, the overall design includes an external solenoid valve 1, as well as an inlet oil passage and an outlet oil passage through which the oil flows.

[0093] The oil supply device 2 and the shock absorber 3 are connected by both the oil inlet and oil outlet lines. Control units are provided on both the oil inlet and oil outlet lines. Under the control of the control units, the oil in the oil supply device 2 can flow into the shock absorber 3 in one direction through the oil supply line, and the oil in the shock absorber 3 can flow to the oil supply device 2 in one direction through the oil outlet line.

[0094] The oil inlet circuit includes a first branch oil inlet circuit connected between the oil supply device 2 and the external solenoid valve 1, and a second branch oil inlet circuit connected between the external solenoid valve 1 and the shock absorber 3. The oil outlet circuit includes a first branch oil outlet circuit connected between the shock absorber 3 and the external solenoid valve 1, and a second branch oil outlet circuit connected between the external solenoid valve 1 and the oil supply device 2.

[0095] The first branch oil inlet circuit and the second branch oil outlet circuit are connected to the oil supply device 2 at one end through the first oil inlet / outlet pipe 601. The second branch oil inlet circuit and the first branch oil outlet circuit are connected to the shock absorber 3 at one end through the second oil inlet / outlet pipe 602.

[0096] The first branch oil inlet and the first branch oil outlet are connected to the external solenoid valve 1 at one end through the third oil inlet / outlet pipe 603. The second branch oil inlet and the second branch oil outlet are connected to the external solenoid valve 1 at one end through the fourth oil inlet / outlet pipe 604.

[0097] A first check valve 701 is provided at the point on the first branch oil inlet line connecting the first oil inlet / outlet pipe 601 and the third oil inlet / outlet pipe 603. A second check valve 702 is provided at the point on the second branch oil inlet line connecting the fourth oil inlet / outlet pipe 604 and the second oil inlet / outlet pipe 602. A third check valve 703 is provided at the point on the first branch oil outlet line connecting the second oil inlet / outlet pipe 602 and the third oil inlet / outlet pipe 603. A fourth check valve 704 is provided at the point on the second branch oil outlet line connecting the fourth oil inlet / outlet pipe 604 and the first oil inlet / outlet pipe 601.

[0098] The inlet of the first check valve 701 is connected to the oil supply device 2, and the outlet is connected to the external solenoid valve 1. The inlet of the second check valve 702 is connected to the external solenoid valve 1, and the outlet is connected to the shock absorber 3. The inlet of the third check valve 703 is connected to the shock absorber 3, and the outlet is connected to the external solenoid valve 1. The inlet of the fourth check valve 704 is connected to the external solenoid valve 1, and the outlet is connected to the oil supply device 2.

[0099] The four check valves—first check valve 701, second check valve 702, third check valve 703, and fourth check valve 704—enable the oil from the oil supply device 2 to flow unidirectionally to the shock absorber 3 via one oil circuit, and the oil in the shock absorber 3 to flow unidirectionally to the oil supply device 2 via another oil circuit. The oil circuit system A also includes a first accumulator 801 connected to the first oil inlet / outlet pipe 601, and a second accumulator 802 connected to the second oil inlet / outlet pipe 602.

[0100] In this preferred embodiment, the hydraulic system A, through the combination of an external solenoid valve 1 and four check valves, meets the bidirectional oil flow requirements between the oil supply device 2 and the shock absorber 3, and offers a wide range of oil pressure adjustment at both the recovery and compression ends. Furthermore, this hydraulic system A provides excellent damping performance for the shock absorber 3, thereby improving vehicle ride comfort and handling stability. Additionally, the external solenoid valve 1 and the check valves are existing structures, allowing the use of readily available standard components, enabling mass production of the hydraulic suspension with lower R&D investment, thus reducing development costs.

[0101] Next, refer to Figure 1 The structure of the oil circuit system A in its application state is described below. Taking a four-wheeled vehicle as an example, the four shock absorbers 3 are used to adjust the position of the four wheels. The structure of the oil supply device 2 is based on existing technology, and includes, for example, [missing information - likely related to the technology]. Figure 1 The oil supply unit 201 and control unit 202 are shown.

[0102] In simple terms, the oil supply unit 201 includes an oil tank and an oil pump that can draw oil from the tank. The control unit 202 includes a main directional valve and four branch directional valves. The oil drawn by the oil pump can flow through the main directional valve to the four branch directional valves, and the oil flowing out of the four branch directional valves can flow through four oil circuit systems A to the four shock absorbers. The oil in the working oil chamber of each shock absorber can flow through the corresponding damping oil circuit to the corresponding directional valve.

[0103] An embodiment of the second aspect of this application provides a hydraulic suspension, including a shock absorber 3, an oil supply device 2 for supplying oil to the shock absorber 3, and the above-described oil circuit system connected between the oil supply device 2 and the shock absorber 3.

[0104] The hydraulic suspension of this application, by applying the above-mentioned oil circuit system A, meets the requirement of bidirectional oil flow between the oil supply device 2 and the shock absorber 3. Furthermore, by utilizing the external solenoid valve 1, which can only flow oil in one direction, the oil pressure adjustment range of the recovery end and the compression end is wider, thereby improving the damping adjustment range of the hydraulic suspension.

[0105] Meanwhile, an embodiment of the third aspect of this application provides a vehicle equipped with the hydraulic suspension described above.

[0106] The vehicle described in this application utilizes the hydraulic suspension described above and the oil circuit system A described above to achieve bidirectional flow of oil between the oil supply device 2 and the shock absorber 3, thereby enabling a wider adjustment range for both the recovery end and the compression end, which can improve the performance and quality of the vehicle.

[0107] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. An oil circuit system suitable for hydraulic suspension and connected between an oil supply device (2) and a shock absorber (3), characterized in that: It includes an external solenoid valve (1) and several oil passages through which the external solenoid valve (1) flows; Each of the oil circuits can connect the oil supply device (2) and the shock absorber (3), and each of the oil circuits is equipped with a control unit; Under the control of the control unit, the oil in the oil supply device (2) can flow unidirectionally to the damper (3) through one of its oil circuits and the external solenoid valve (1), and the oil in the damper (3) can flow unidirectionally to the oil supply device (2) through the other oil circuit and the external solenoid valve (1).

2. The oil circuit system according to claim 1, characterized in that: The oil circuits include a first branch oil inlet circuit connected between the oil supply device (2) and the external solenoid valve (1), a second branch oil inlet circuit connected between the external solenoid valve (1) and the shock absorber (3), a first branch oil outlet circuit connected between the shock absorber (3) and the external solenoid valve (1), and a second branch oil outlet circuit connected between the external solenoid valve (1) and the oil supply device (2). The control unit is provided on the first branch oil inlet circuit, the second branch oil inlet circuit, the first branch oil outlet circuit, and the second branch oil outlet circuit.

3. The oil circuit system according to claim 2, characterized in that: The first branch oil inlet circuit and the second branch oil outlet circuit are connected to the oil supply device (2) at one end through the first oil inlet / outlet pipe (601); The second branch oil inlet circuit and the first branch oil outlet circuit are connected to the damper (3) at one end through the second oil inlet / outlet pipe (602).

4. The oil circuit system according to claim 3, characterized in that: The first branch oil inlet circuit and the first branch oil outlet circuit are connected to the external solenoid valve (1) at one end through the third oil inlet / outlet pipe (603); The second branch oil inlet circuit and the second branch oil outlet circuit are connected to the external solenoid valve (1) at one end through the fourth oil inlet / outlet pipe (604).

5. The oil circuit system according to claim 4, characterized in that: The first branch oil inlet circuit has a first branch oil inlet section (401) connected between the first oil inlet / outlet pipe (601) and the third oil inlet / outlet pipe (603), and the second branch oil inlet circuit has a second branch oil inlet section (402) connected between the fourth oil inlet / outlet pipe (604) and the second oil inlet / outlet pipe (602). The first branch oil outlet circuit has a first branch oil outlet section (501) connected between the second oil inlet / outlet pipe (602) and the third oil inlet / outlet pipe (603); the second branch oil outlet circuit has a second branch oil outlet section (502) connected between the fourth oil inlet / outlet pipe (604) and the first oil inlet / outlet pipe (601). The control unit is provided on the first branch oil inlet section (401), the second branch oil inlet section (402), the first branch oil outlet section (501), and the second branch oil outlet section (502).

6. The oil circuit system according to claim 5, characterized in that: The control units on the first branch oil inlet section (401), the second branch oil inlet section (402), the first branch oil outlet section (501), and the second branch oil outlet section (502) all include one-way valves.

7. The oil circuit system according to any one of claims 3-6, characterized in that: It also includes a first accumulator (801), which is connected to the first oil inlet / outlet pipe (601).

8. The oil circuit system according to claim 7, characterized in that: It also includes a second accumulator (802), which is connected to the second oil inlet / outlet pipe (602).

9. A hydraulic suspension, characterized in that: The system includes a shock absorber (3), an oil supply device (2) for supplying oil to the shock absorber (3), and an oil circuit system as described in any one of claims 1-8 connected between the oil supply device (2) and the shock absorber (3).

10. A vehicle, characterized in that: The vehicle is equipped with the hydraulic suspension as described in claim 9.

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