Oil-gas suspension hydraulic system with variable connection mode of emergency rescue vehicle

Abstract

The invention discloses a hydro-pneumatic suspension hydraulic system with a variable connection mode of an emergency rescue vehicle, and relates to the technical field of vehicle suspension. Switching of multiple cross-linking modes can be achieved according to road conditions, the anti-roll and anti-pitching capacity of the vehicle is improved, and vibration of the vehicle is reduced. The hydraulic system comprises a first actuator, a second actuator, a third actuator, a fourth actuator, a first bridge type communication valve group, a second bridge type communication valve group, a first two-position four-way reversing valve and a second two-position four-way reversing valve. The first actuator and the second actuator are both communicated with the first bridge type communication valve group; the third actuator and the fourth actuator are both communicated with the second bridge type communication valve group; the first actuator and the third actuator are both communicated with the first two-position four-way reversing valve; the second actuator and the fourth actuator are both communicated with the second two-position four-way reversing valve.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle suspension, and in particular to an oil-gas suspension hydraulic system with a variable connection mode for emergency rescue vehicles. Background Art

[0002] Emergency rescue vehicles have complex driving conditions and need to carry a variety of rescue equipment, with a large load-bearing mass. Rescue vehicles often face a variety of rescue situations, and their driving conditions often change. When road conditions change, the body vibrates greatly and is subject to strong impact. The oil-gas suspension system can automatically adjust the extension and contraction of the suspension hydraulic cylinder according to different driving conditions to ensure that each tire bears the same load, thereby improving the vehicle's passability, smoothness, and handling stability. In addition, large multi-axle vehicles often use cross-connected oil-gas suspension systems. Compared with independent oil-gas suspension systems, cross-connected oil-gas suspension systems have the characteristics of large load-bearing capacity, balanced axle loads, and resistance to body roll and pitch.

[0003] The cross-linking modes of the oil-gas suspension hydraulic system commonly used in heavy-duty multi-axle vehicles are mainly divided into the front and rear axle connection type on the same side, the left and right connection type on the same bridge, and the multi-bridge mixed connection type. Different cross-linking modes have different performances and functions. The driving conditions of rescue vehicles are diverse, but the cross-linking mode of the oil-gas suspension hydraulic system of my country's heavy-duty emergency rescue vehicles cannot be changed at present. Therefore, the development of an oil-gas suspension hydraulic system with a variable cross-linking mode is of great significance for emergency rescue vehicles to solve this contradiction. Summary of the invention

[0004] The embodiments of the present application provide an oil-gas suspension hydraulic system with variable interconnection modes for emergency rescue vehicles, which can switch between multiple interconnection modes according to road conditions, improve the vehicle's anti-roll and anti-pitch capabilities, and reduce vehicle vibration.

[0005] To achieve the above-mentioned objectives, an embodiment of the present application provides an oil-gas suspension hydraulic system with a variable connection mode for an emergency rescue vehicle, including a first actuator, a second actuator, a third actuator, a fourth actuator, a first bridge-type connecting valve group, a second bridge-type connecting valve group, a first two-position four-way reversing valve and a second two-position four-way reversing valve; the first actuator and the second actuator are both connected to the first bridge-type connecting valve group; the third actuator and the fourth actuator are both connected to the second bridge-type connecting valve group; the first actuator and the third actuator are both connected to the first two-position four-way reversing valve; the second actuator and the fourth actuator are both connected to the second two-position four-way reversing valve.

[0006] Furthermore, the first interface of the first bridge-type connecting valve group is connected to the first cavity of the first actuator, the second interface is connected to the first cavity of the second actuator, the third interface is connected to the second cavity of the first actuator, and the fourth interface is connected to the second cavity of the second actuator.

[0007] Furthermore, the first bridge-type connecting valve group includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve and a sixth solenoid valve; the first oil port of the first solenoid valve and the first oil port of the second solenoid valve are both connected to the third interface of the first bridge-type connecting valve group; the first oil port of the third solenoid valve and the first oil port of the fifth solenoid valve are both connected to the first interface of the first bridge-type connecting valve group; the second oil port of the first solenoid valve, the second oil port of the third solenoid valve, the first oil port of the fourth solenoid valve, and the first oil port of the sixth solenoid valve are connected to each other; the second oil port of the second solenoid valve and the second oil port of the fourth solenoid valve are both connected to the second interface of the first bridge-type connecting valve group; the second oil port of the fifth solenoid valve and the second oil port of the sixth solenoid valve are both connected to the fourth interface of the first bridge-type connecting valve group.

[0008] Furthermore, the first interface of the second bridge-type connecting valve group is connected to the first cavity of the third actuator, the second interface is connected to the first cavity of the fourth actuator, the third interface is connected to the second cavity of the third actuator, and the fourth interface is connected to the second cavity of the fourth actuator.

[0009] Further, the second bridge-type connecting valve group includes a seventh solenoid valve, an eighth solenoid valve, a ninth solenoid valve, a tenth solenoid valve, an eleventh solenoid valve and a twelfth solenoid valve; the first oil port of the seventh solenoid valve and the first oil port of the eighth solenoid valve are both connected to the third interface of the second bridge-type connecting valve group; the first oil port of the ninth solenoid valve and the first oil port of the eleventh solenoid valve are both connected to the first interface of the second bridge-type connecting valve group; the second oil port of the seventh solenoid valve, the second oil port of the ninth solenoid valve, the first oil port of the tenth solenoid valve, and the first oil port of the twelfth solenoid valve are connected to each other; the second oil port of the eighth solenoid valve and the second oil port of the tenth solenoid valve are both connected to the second interface of the second bridge-type connecting valve group; the second oil port of the eleventh solenoid valve and the second oil port of the twelfth solenoid valve are both connected to the fourth interface of the second bridge-type connecting valve group.

[0010] Furthermore, the first cavity of the first actuator, the first cavity of the second actuator, the first cavity of the third actuator and the first cavity of the fourth actuator are all rodless cavities; the second cavity of the first actuator, the second cavity of the second actuator, the second cavity of the third actuator and the second cavity of the fourth actuator are all rod cavities.

[0011] Furthermore, the first oil port of the first two-position four-way reversing valve is connected to the first cavity of the first actuator, the second oil port is connected to the second cavity of the first actuator, the third oil port is connected to the first cavity of the third actuator, and the fourth oil port is connected to the second cavity of the third actuator.

[0012] Furthermore, the first oil port of the second two-position four-way reversing valve is connected to the second cavity of the second actuator, the second oil port is connected to the first cavity of the second actuator, the third oil port is connected to the second cavity of the fourth actuator, and the fourth oil port is connected to the first cavity of the fourth actuator.

[0013] Further, a first pressure sensor and a first accumulator are provided on the pipeline between the first cavity of the first actuator and the first bridge-type connecting valve group; a second pressure sensor and a second accumulator are provided on the pipeline between the first cavity of the second actuator and the first bridge-type connecting valve group; a third pressure sensor is provided on the pipeline between the second cavity of the first actuator and the first bridge-type connecting valve group; a fourth pressure sensor is provided on the pipeline between the second cavity of the second actuator and the first bridge-type connecting valve group; a fifth pressure sensor is provided on the pipeline between the first cavity of the third actuator and the second bridge-type connecting valve group; a sixth pressure sensor is provided on the pipeline between the first cavity of the fourth actuator and the second bridge-type connecting valve group; a seventh pressure sensor and a third accumulator are provided on the pipeline between the second cavity of the third actuator and the second bridge-type connecting valve group; an eighth pressure sensor and a fourth accumulator are provided on the pipeline between the second cavity of the fourth actuator and the second bridge-type connecting valve group.

[0014] Further, the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, the sixth solenoid valve, the seventh solenoid valve, the eighth solenoid valve, the ninth solenoid valve, the tenth solenoid valve, the eleventh solenoid valve and the twelfth solenoid valve are all two-position two-way reversing valves.

[0015] Compared with the prior art, this application has the following beneficial effects:

[0016] 1. In the face of different driving conditions, the embodiments of the present application can switch between the front and rear axle interconnection mode on the same side, the same-bridge interconnection mode and the multi-bridge mixed interconnection mode at any time, so that the vehicle can run smoothly under various working conditions, improve the vehicle's anti-pitch and anti-roll capabilities, reduce vehicle vibration, and enable emergency rescue vehicles to be used in a variety of extreme working conditions.

[0017] 2. The same-bridge interconnection mode of the embodiment of the present application has three interconnection modes, which increases the interconnection redundancy and improves the stability of the interconnection.

[0018] 3. In the embodiment of the present application, each main pipeline is provided with a pressure sensor, which can monitor whether the oil in the pipeline of the current interconnection mode is blocked. If the pipeline is blocked, it can switch to the redundant interconnection mode.

[0019] 4. The embodiment of the present application has a simple connection structure, stable operation, and low cost, and can be applied to various large-scale vehicle oil and gas suspension systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of the installation of an embodiment of the present application. DETAILED DESCRIPTION

[0023] 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.

[0024] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, they can understand the specific meanings of the above terms in this application according to specific circumstances.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" can explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0027] Reference Figure 1 and Figure 2The embodiment of the present application provides a variable cross-linking oil-gas suspension hydraulic system for emergency rescue vehicles, including a first actuator 11, a second actuator 12, a third actuator 13, a fourth actuator 14, a first bridge-type connecting valve group 71, a second bridge-type connecting valve group 72, a first two-position four-way reversing valve 61, and a second two-position four-way reversing valve 62. The first actuator 11 and the second actuator 12 are both connected to the first bridge-type connecting valve group 71, the third actuator 13 and the fourth actuator 14 are both connected to the second bridge-type connecting valve group 72, the first actuator 11 and the third actuator 13 are both connected to the first two-position four-way reversing valve 61, and the second actuator 12 and the fourth actuator 14 are both connected to the second two-position four-way reversing valve 62.

[0028] The first actuator 11, the second actuator 12, the third actuator 13 and the fourth actuator 14 each include two cavities. Specifically, the first cavity E1 of the first actuator, the first cavity E2 of the second actuator, the first cavity E3 of the third actuator and the first cavity E4 of the fourth actuator are all rodless cavities. The second cavity F1 of the first actuator, the second cavity F2 of the second actuator, the second cavity F3 of the third actuator and the second cavity F4 of the fourth actuator are all rod-containing cavities.

[0029] The first bridge-type communication valve group 71 and the second bridge-type communication valve group 72 are both composed of six two-position two-way reversing valves, and the six two-position two-way reversing valves are all normally closed electromagnetic reversing valves.

[0030] The first bridge-type communication valve group 71 has four interfaces, namely, the first interface E01 of the first bridge-type communication valve group, the second interface E02 of the first bridge-type communication valve group, the third interface F01 of the first bridge-type communication valve group, and the fourth interface F02 of the first bridge-type communication valve group. The second bridge-type communication valve group 72 also has four interfaces, namely, the first interface E03 of the second bridge-type communication valve group, the second interface E04 of the second bridge-type communication valve group, the third interface F03 of the second bridge-type communication valve group, and the fourth interface F04 of the second bridge-type communication valve group.

[0031] The first cavity E1 of the first actuator is connected to the first interface E01 of the first bridge-type connecting valve group and the first oil port C1 of the first two-position four-way reversing valve through a pipeline, and the second cavity F1 of the first actuator is connected to the third interface F01 of the first bridge-type connecting valve group and the second oil port C2 of the first two-position four-way reversing valve through a pipeline.

[0032] The first cavity E2 of the second actuator is connected to the second interface E02 of the first bridge-type connecting valve group and the second oil port C4 of the second two-position four-way reversing valve through a pipeline. The second cavity F2 of the second actuator is connected to the fourth interface F02 of the first bridge-type connecting valve group and the first oil port C3 of the second two-position four-way reversing valve through a pipeline.

[0033] The first cavity E3 of the third actuator is connected to the first interface E03 of the second bridge-type connecting valve group and the third oil port D1 of the first two-position four-way reversing valve through a pipeline, and the second cavity F3 of the third actuator is connected to the third interface F03 of the second bridge-type connecting valve group and the fourth oil port D2 of the first two-position four-way reversing valve through a pipeline.

[0034] The first cavity of the fourth actuator 14 is connected to the second interface E04 of the second bridge-type connecting valve group and the fourth oil port D4 of the second two-position four-way reversing valve through a pipeline. The second cavity F4 of the fourth actuator is connected to the fourth interface F04 of the second bridge-type connecting valve group and the third oil port D3 of the second two-position four-way reversing valve through a pipeline.

[0035] The first bridge communication valve group 71 includes a first solenoid valve 41 , a second solenoid valve 42 , a third solenoid valve 43 , a fourth solenoid valve 44 , a fifth solenoid valve 45 and a sixth solenoid valve 46 .

[0036] The first oil port A3 of the third solenoid valve and the first oil port A5 of the fifth solenoid valve are both connected to the first interface E01 of the first bridge-type connecting valve group through pipelines. The first oil port A1 of the first solenoid valve and the first oil port A2 of the second solenoid valve are both connected to the third interface F01 of the first bridge-type connecting valve group through pipelines. The second oil port B2 of the second solenoid valve and the second oil port B4 of the fourth solenoid valve are both connected to the second interface E02 of the first bridge-type connecting valve group through pipelines. The second oil port B5 of the fifth solenoid valve and the second oil port B6 of the sixth solenoid valve are both connected to the fourth interface F02 of the first bridge-type connecting valve group through pipelines. The second oil port B1 of the first solenoid valve is connected to the first oil port A6 of the sixth solenoid valve through a pipeline, and the second oil port B3 of the third solenoid valve is connected to the first oil port A4 of the fourth solenoid valve through a pipeline, and the two pipelines are connected to each other.

[0037] The second bridge communication valve group 72 includes a seventh solenoid valve 47 , an eighth solenoid valve 48 , a ninth solenoid valve 49 , a tenth solenoid valve 410 , an eleventh solenoid valve 411 and a twelfth solenoid valve 412 .

[0038] The first oil port A9 of the ninth solenoid valve and the first oil port A11 of the eleventh solenoid valve are both connected to the first interface E03 of the second bridge-type connecting valve group. The first oil port A7 of the seventh solenoid valve and the first oil port A8 of the eighth solenoid valve are both connected to the third interface F03 of the second bridge-type connecting valve group. The second oil port B8 of the eighth solenoid valve and the second oil port B10 of the tenth solenoid valve are both connected to the second interface E04 of the second bridge-type connecting valve group. The second oil port B11 of the eleventh solenoid valve and the second oil port B12 of the twelfth solenoid valve are both connected to the fourth interface F04 of the second bridge-type connecting valve group. The second oil port B7 of the seventh solenoid valve is connected to the first oil port A12 of the twelfth solenoid valve through a pipeline, and the second oil port B9 of the ninth solenoid valve is connected to the first oil port A10 of the tenth solenoid valve through a pipeline, and the two pipelines are connected to each other.

[0039] A first pressure sensor 21 and a first accumulator 31 are provided on the pipeline between the first chamber E1 of the first actuator and the first bridge-type communication valve group 71. A second pressure sensor 22 and a second accumulator 32 are provided on the pipeline between the first chamber E2 of the second actuator and the first bridge-type communication valve group 71. A third pressure sensor 23 is provided on the pipeline between the second chamber F1 of the first actuator and the first bridge-type communication valve group 71. A fourth pressure sensor 24 is provided on the pipeline between the second chamber F2 of the second actuator and the first bridge-type communication valve group 71.

[0040] A fifth pressure sensor 25 is provided on the pipeline between the first chamber E3 of the third actuator and the second bridge-type communication valve group 72. A sixth pressure sensor 26 is provided on the pipeline between the first chamber E4 of the fourth actuator and the second bridge-type communication valve group 72. A seventh pressure sensor 27 and a third accumulator 33 are provided on the pipeline between the second chamber F3 of the third actuator and the second bridge-type communication valve group 72. An eighth pressure sensor 28 and a fourth accumulator 34 are provided on the pipeline between the second chamber F4 of the fourth actuator and the second bridge-type communication valve group 72.

[0041] exist Figure 2 In the schematic diagram of the installation position of the embodiment of the present application, a plurality of two-position four-way solenoid valves, pressure sensors, accumulators, bridge-type intercommunication valve groups and pipelines are integrated and arranged in the valve block 8, and the valve block 8 is fixed on the frame 9. The first actuator 11, the second actuator 12, the third actuator 13 and the fourth actuator 14 are all arranged between the frame 9 and the wheel 10, and the rod chamber and the rodless chamber of the actuator are connected to the valve block 8 through pipelines.

[0042] When the embodiment of the present application is working, the working mode can be switched according to the road conditions. The switchable modes include the front and rear axle interconnection mode on the same side, the same axle interconnection mode, and the multi-axle mixed interconnection mode.

[0043] The first mode is the same-side front and rear axle interconnection mode, which can realize the interconnection of the front and rear axle actuators on the same side. The implementation method is as follows:

[0044] The solenoid coil 7DT of the first two-position four-way solenoid valve is energized, and the first cavity E1 of the first actuator is connected with the first cavity E3 of the third actuator and the first accumulator 31, and the second cavity F1 of the first actuator is connected with the second cavity F3 of the third actuator and the third accumulator 33. The solenoid coil 8DT of the second two-position four-way solenoid valve is energized, and the first cavity E2 of the second actuator is connected with the first cavity E4 of the fourth actuator and the second accumulator 32, and the second cavity F2 of the second actuator is connected with the second cavity F4 of the fourth actuator and the fourth accumulator 34. When the vehicle has a large single-bridge load due to road conditions and poor wheel grounding, it can be switched to this mode to balance the loads on the front and rear axles of the vehicle by connecting the front and rear axle actuators.

[0045] The second mode is the same-bridge cross-connection mode, which can realize the connection between the left and right actuators of the same axle. There are three cross-connection methods to realize this mode.

[0046] The first cross-linking method is implemented as follows:

[0047] The electromagnet coil 5DT of the fifth solenoid valve 45 is energized, and the first cavity E1 of the first actuator is connected with the second cavity F2 of the second actuator and the first accumulator 31. The electromagnet coil 2DT of the second solenoid valve 42 is energized, and the second cavity F1 of the first actuator is connected with the first cavity E2 of the second actuator and the second accumulator 32. The electromagnet coil 10DT of the eighth solenoid valve 48 is energized, and the second cavity F3 of the third actuator is connected with the first cavity E4 of the fourth actuator and the third accumulator 33. The electromagnet coil 13DT of the eleventh solenoid valve 411 is energized, and the first cavity E3 of the third actuator is connected with the second cavity F4 of the fourth actuator and the fourth accumulator 34. This mode can improve the anti-roll capability of the vehicle. When the vehicle turns or the lateral force generated by the driving road conditions causes the vehicle to roll, this interconnection mode can be switched.

[0048] In the second mode, a second interconnection method is provided to achieve interconnection redundancy, which is implemented as follows:

[0049] The electromagnet coil 2DT of the second solenoid valve 42 is energized, and the second cavity F1 of the first actuator is connected to the first cavity E2 of the second actuator and the second accumulator 32. The electromagnet coil 3DT of the third solenoid valve 43 is energized, and the electromagnet coil 6DT of the sixth solenoid valve 46 is energized, and the first cavity E1 of the first actuator is connected to the second cavity F2 of the second actuator and the first accumulator 31. The electromagnet coil 10DT of the eighth solenoid valve 48 is energized, and the second cavity F3 of the third actuator is connected to the first cavity E4 of the fourth actuator and the third accumulator 33. The electromagnet coil 11DT of the ninth solenoid valve 49 is energized, and the electromagnet coil 14DT of the twelfth solenoid valve 412 is energized, and the first cavity E3 of the third actuator is connected to the second cavity F4 of the fourth actuator and the fourth accumulator 34. This interconnection method is intended to improve system stability. When the value of the first pressure sensor 21, the fourth pressure sensor 24, the fifth pressure sensor 25 or the eighth pressure sensor 28 is higher than the set value, that is, when the solenoid valve fails and the pipeline is blocked, this interconnection mode is enabled.

[0050] In the second mode, a third interconnection method is provided to achieve interconnection redundancy, which is implemented as follows:

[0051] The electromagnet coil 5DT of the fifth solenoid valve 45 is energized, and the first cavity E1 of the first actuator is connected with the second cavity F2 of the second actuator and the first accumulator 31. The electromagnet coil 1DT of the first solenoid valve 41 is energized, and the electromagnet coil 4DT of the fourth solenoid valve is energized, and the second cavity F1 of the first actuator is connected with the first cavity E2 of the second actuator and the second accumulator 32. The electromagnet coil 13DT of the eleventh solenoid valve 411 is energized, and the second cavity F3 of the third actuator is connected with the first cavity E4 of the fourth actuator and the third accumulator 33. The electromagnet coil 9DT of the seventh solenoid valve 47 is energized, and the electromagnet coil 12DT of the tenth solenoid valve 410 is energized, and the first cavity E3 of the third actuator is connected with the second cavity F4 of the fourth actuator and the fourth accumulator 34. When the value of the second pressure sensor 22, the third pressure sensor 23, the sixth pressure sensor 26 or the seventh pressure sensor 27 is higher than the set value, this interconnection mode is enabled.

[0052] The third mode is the multi-axle hybrid interconnection mode, where the left and right actuators of each axle are connected and the front axle actuator and the rear axle actuator on the same side are connected. The implementation method is as follows:

[0053] The solenoid coil 2DT of the second solenoid valve 42 is energized, and the second cavity F1 of the first actuator is connected to the first cavity E2 of the second actuator and the second accumulator 32. The solenoid coil 5DT of the fifth solenoid valve 45 is energized, and the first cavity E1 of the first actuator is connected to the second cavity F2 of the second actuator and the first accumulator 31. The solenoid coil 7DT of the first two-position four-way solenoid valve is energized, and the first cavity E1 of the first actuator is connected to the first cavity E3 of the third actuator and the first accumulator 31. The second cavity F1 of the first actuator is connected to the second cavity F3 of the third actuator and the third accumulator 33. The solenoid coil 8DT of the second two-position four-way solenoid valve is energized. The first cavity E2 of the second actuator is connected to the first cavity E4 of the fourth actuator and the second accumulator 32. The second cavity F2 of the second actuator is connected to the second cavity F4 of the fourth actuator and the fourth accumulator 34. The solenoid coil 10DT of the eighth solenoid valve 48 is energized, and the second cavity F3 of the third actuator is connected to the first cavity E4 of the fourth actuator and the third accumulator 33. The solenoid coil 13DT of the eleventh solenoid valve 411 is energized, and the first cavity E3 of the third actuator is connected to the second cavity F4 of the fourth actuator and the fourth accumulator 34. This mode can improve the roll angle stiffness and damping without increasing the vertical stiffness and damping, and improve the vehicle's anti-pitch capability.

[0054] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A variable oil-gas suspension hydraulic system for emergency rescue vehicles, characterized in that: It includes a first actuator, a second actuator, a third actuator, a fourth actuator, a first bridge-type connecting valve group, a second bridge-type connecting valve group, a first two-position four-way reversing valve and a second two-position four-way reversing valve; the first actuator and the second actuator are both connected to the first bridge-type connecting valve group; the third actuator and the fourth actuator are both connected to the second bridge-type connecting valve group; the first actuator and the third actuator are both connected to the first two-position four-way reversing valve; the second actuator and the fourth actuator are both connected to the second two-position four-way reversing valve.

2. The oil-gas suspension hydraulic system with variable cross-coupling mode for emergency rescue vehicles according to claim 1, characterized in that: The first interface of the first bridge connecting valve group is connected to the first cavity of the first actuator, the second interface is connected to the first cavity of the second actuator, the third interface is connected to the second cavity of the first actuator, and the fourth interface is connected to the second cavity of the second actuator.

3. The oil-gas suspension hydraulic system with variable cross-coupling mode for emergency rescue vehicles according to claim 2, characterized in that: The first bridge-type connecting valve group includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve and a sixth solenoid valve; the first oil port of the first solenoid valve and the first oil port of the second solenoid valve are both connected to the third interface of the first bridge-type connecting valve group; the first oil port of the third solenoid valve and the first oil port of the fifth solenoid valve are both connected to the first interface of the first bridge-type connecting valve group; the second oil port of the first solenoid valve, the second oil port of the third solenoid valve, the first oil port of the fourth solenoid valve, and the first oil port of the sixth solenoid valve are connected to each other; the second oil port of the second solenoid valve and the second oil port of the fourth solenoid valve are both connected to the second interface of the first bridge-type connecting valve group; the second oil port of the fifth solenoid valve and the second oil port of the sixth solenoid valve are both connected to the fourth interface of the first bridge-type connecting valve group.

4. The oil-gas suspension hydraulic system with variable cross-coupling mode for emergency rescue vehicles according to claim 3 is characterized in that: The first interface of the second bridge connecting valve group is connected to the first cavity of the third actuator, the second interface is connected to the first cavity of the fourth actuator, the third interface is connected to the second cavity of the third actuator, and the fourth interface is connected to the second cavity of the fourth actuator.

5. The oil-gas suspension hydraulic system with variable cross-coupling mode for emergency rescue vehicles according to claim 4, characterized in that: The second bridge-type connecting valve group includes a seventh solenoid valve, an eighth solenoid valve, a ninth solenoid valve, a tenth solenoid valve, an eleventh solenoid valve and a twelfth solenoid valve; the first oil port of the seventh solenoid valve and the first oil port of the eighth solenoid valve are both connected to the third interface of the second bridge-type connecting valve group; the first oil port of the ninth solenoid valve and the first oil port of the eleventh solenoid valve are both connected to the first interface of the second bridge-type connecting valve group; the second oil port of the seventh solenoid valve, the second oil port of the ninth solenoid valve, the first oil port of the tenth solenoid valve, and the first oil port of the twelfth solenoid valve are connected to each other; the second oil port of the eighth solenoid valve and the second oil port of the tenth solenoid valve are both connected to the second interface of the second bridge-type connecting valve group; the second oil port of the eleventh solenoid valve and the second oil port of the twelfth solenoid valve are both connected to the fourth interface of the second bridge-type connecting valve group.

6. The oil-gas suspension hydraulic system with variable cross-coupling mode for emergency rescue vehicles according to claim 2, characterized in that: The first cavity of the first actuator, the first cavity of the second actuator, the first cavity of the third actuator and the first cavity of the fourth actuator are all rodless cavities; the second cavity of the first actuator, the second cavity of the second actuator, the second cavity of the third actuator and the second cavity of the fourth actuator are all rod cavities.

7. The oil-gas suspension hydraulic system with variable cross-coupling mode for emergency rescue vehicles according to claim 6, characterized in that: The first oil port of the first two-position four-way reversing valve is connected to the first cavity of the first actuator, the second oil port is connected to the second cavity of the first actuator, the third oil port is connected to the first cavity of the third actuator, and the fourth oil port is connected to the second cavity of the third actuator.

8. The oil-gas suspension hydraulic system with variable cross-coupling mode for emergency rescue vehicles according to claim 7, characterized in that: The first oil port of the second two-position four-way reversing valve is connected to the second cavity of the second actuator, the second oil port is connected to the first cavity of the second actuator, the third oil port is connected to the second cavity of the fourth actuator, and the fourth oil port is connected to the first cavity of the fourth actuator.

9. The oil-gas suspension hydraulic system with variable cross-coupling mode for emergency rescue vehicles according to claim 2, characterized in that: A first pressure sensor and a first accumulator are provided on the pipeline between the first cavity of the first actuator and the first bridge-type communication valve group; a second pressure sensor and a second accumulator are provided on the pipeline between the first cavity of the second actuator and the first bridge-type communication valve group; a third pressure sensor is provided on the pipeline between the second cavity of the first actuator and the first bridge-type communication valve group; A fourth pressure sensor is provided on the pipeline between the second cavity of the second actuator and the first bridge-type communication valve group; A fifth pressure sensor is provided on the pipeline between the first cavity of the third actuator and the second bridge-type connecting valve group; a sixth pressure sensor is provided on the pipeline between the first cavity of the fourth actuator and the second bridge-type connecting valve group; a seventh pressure sensor and a third accumulator are provided on the pipeline between the second cavity of the third actuator and the second bridge-type connecting valve group; an eighth pressure sensor and a fourth accumulator are provided on the pipeline between the second cavity of the fourth actuator and the second bridge-type connecting valve group.

10. The oil-gas suspension hydraulic system with variable cross-coupling mode for emergency rescue vehicles according to claim 5, characterized in that: The first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, the sixth solenoid valve, the seventh solenoid valve, the eighth solenoid valve, the ninth solenoid valve, the tenth solenoid valve, the eleventh solenoid valve and the twelfth solenoid valve are all two-position two-way reversing valves.

Images