WO2012024945A1

WO2012024945A1 - Suspension valve, oil-gas suspension system and engineering vehicle

Info

Publication number: WO2012024945A1
Application number: PCT/CN2011/074254
Authority: WO
Inventors: 詹纯新; 刘权; 李英智; 张建军; 郭堃; 李义; 郭纪梅; 胡廷江; 王启涛; 刘学检; 冯科喜; 奉松生
Original assignee: 长沙中联重工科技发展股份有限公司; 湖南中联重科专用车有限责任公司
Priority date: 2010-08-26
Filing date: 2011-05-18
Publication date: 2012-03-01
Also published as: CN102039792A; CN102039792B

Abstract

Disclosed is a suspension valve, which comprises an oil inlet switch lock-up valve (22), an oil return switch lock-up valve (21) and differential pressure sensing and logic control units. The differential pressure sensing and logic control units include a logic shuttle valve (23), a differential pressure sensing and locking valve (24) and a guide control valve (25). The oil return switch lock-up valve (21) can open and lock the oil return path, and the oil inlet switch lock-up valve (22) can open and lock the oil inlet path. The logic shuttle valve (23) compares the pressure logics between a rod side chamber of a suspension oil cylinder and a rodless chamber of the suspension oil cylinder. The differential pressure sensing and locking valve (24) senses the differential pressure between the rod side chamber of the suspension oil cylinder and the rodless chamber of the suspension oil cylinder, as well as connects and locks the two chambers. Besides, an oil-gas suspension system and an engineering vehicle adopting said suspension valve are also disclosed. By employing the differential pressure sensing and logic control units, the invention more reliably enables long-time maintaining of both a rigid mode and a flexible mode of the suspension system, realizes a quick and reliable conversion between the rigid mode and the flexible mode, effectively reduces the number of units in the suspension valve of the axle suspension system, thus achieving an easy and convenient control.

Description

Suspension valve, oil and gas suspension system and construction vehicle

Technical field

The invention relates to a suspension valve. Furthermore, the invention relates to an oil and gas suspension system and an engineering vehicle comprising the suspension valve. Background technique

Hydro-pneumatic suspension systems are widely used in a variety of mobile construction machinery, such as wheel loaders, mine dump trucks, wheeled excavators, and mobile cranes.

The existing oil and gas suspension system is mainly realized by a combination of a suspension cylinder and an accumulator, a suspension cylinder and an accumulator plus a suspension valve combination. Each manufacturer basically adopts a suspension cylinder and an accumulator plus a suspension valve combination. . Referring to Figure 1, each of the axles A is symmetrically disposed with suspension cylinders 7, 10, the upper ends of the suspension cylinders 7, 10 are hinged to the frame F or the body, and the lower ends are hinged to the corresponding axles A. Each pair of suspension cylinders 7, 10 is connected with a matching suspension valve 8, 9 and an accumulator 4, and the existing suspension technology, such as the patent CN 101618669A, uses a two-position two-way valve to control the same side suspension cylinder. The rod cavity is connected with the accumulator to realize the rigid and flexible conversion of the suspension system. The so-called rigid state means that the suspension cylinder is only subjected to the weight of the whole vehicle by a certain rod cavity, and the cylinder has a rod cavity and a damping component. The accumulator is connected, and the flexible state is reversed; the rigid state is generally used when the vehicle is hoisting (such as a mobile crane lifting heavy objects) and the vehicle is completely extinguished and broken, and the rest of the working conditions generally use a flexible state. . The rod cavity of each suspension cylinder communicates with the accumulator on the opposite side thereof to obtain a large roll stiffness, and the pressure oil passage and the return oil passage are respectively controlled by the 2/2-way valve and the rodless cavity of the suspension cylinder respectively. The connection between the two to achieve the lifting control of the vehicle body, the oil and gas suspension circuit of the middle axle and the rear axle oil and gas suspension control loop is a lifting control group to realize the leveling operation of the vehicle body, which is essentially through the suspension valve Suspension cylinders and accumulators are connected to this universal mode for suspension. However, the existing hydro-pneumatic suspension technology adopts a two-position two-way valve for rigid flexible conversion, which is affected by the suspension cylinder, and the suspension system cannot be effectively locked in a rigid state, in a flexible state. The two-position two-way valve directly bears the vehicle pressure, because the hydraulic pressure and the air pressure of the two-position two-way valve are relatively large, and there is a possibility that the flexibility is automatically converted into rigidity when the pressure of the air pressure changes. In addition, the suspension valve preferentially causes the suspension to rise, resulting in a complicated logic relationship of the suspension valve, and the number of hydraulic components used for the lifting function must be increased, which also increases the difficulty of logic control.

Accordingly, there is a need for a new type of suspension valve that overcomes the above-discussed shortcomings of the prior art. Summary of the invention

The technical problem to be solved by the present invention is to provide a suspension valve which can ensure the stability of the flexible working condition and realize the main functions of the suspension valve, and has the advantages of strong control capability, simple control logic relationship and reliable operation.

The invention also provides an oil and gas suspension system, which can ensure stable and flexible working conditions, has strong control capability, simple control logic relationship and reliable operation.

In addition, the present invention also provides an engineering vehicle, wherein the oil and gas suspension system of the engineering vehicle can ensure stable and flexible working conditions, has strong control capability, simple control logic relationship, and reliable operation.

In order to solve the above technical problem, the present invention provides a suspension valve, wherein the suspension valve includes: an oil inlet switch lock valve, the oil inlet switch lock valve is connected to the oil inlet and the second interface of the suspension valve a return oil switch lock valve, the oil return switch lock valve is connected between the oil return port of the suspension valve and the first interface; a differential pressure sensing logic control component group, the differential pressure sensing logic control component The group includes a logic shuttle valve, a differential pressure sensing lock valve, and a pilot control valve, wherein the oil inlet of the logic shuttle valve is respectively connected to the first interface and the accumulator interface of the suspension valve, the energy storage The device interface is connected to the second interface via a side chamber of the differential pressure sensing lock valve, and a side chamber of the differential pressure sensing lock valve is further connected to the first interface, When the differential pressure sensing lock valve is locked, the accumulator interface is disconnected from the first interface oil passage, and the differential pressure sensing lock valve is another a side chamber connected to an oil outlet of the logic shuttle valve and the oil return port via the pilot control valve, the pilot control valve selectively causing another side chamber of the differential pressure sensing lock valve The chamber is in communication with an oil outlet or a return port of the logic shuttle valve, and a pilot control port of the pilot control valve is coupled to a control interface of the suspension valve.

The present invention also provides an oil and gas suspension system, wherein the oil and gas suspension system includes at least one pair of the above suspension valves, and the at least one pair of suspension valves are respectively connected with a matching left suspension cylinder group and a right suspension cylinder group Wherein the rod cavities of the left suspension cylinders of the left suspension cylinder group are in communication with each other, and the rodless cavities of the respective left suspension cylinders are also in communication with each other, in the right suspension cylinder group The rod cavities of the respective right suspension cylinders are in communication with each other, and the rodless cavities of the respective right side suspension cylinders are also in communication with each other, wherein the first interface of the left suspension valve of the pair of suspension valves is opposite to the left side a rodless cavity of each of the left suspension cylinders in the suspension cylinder group is connected, and a second interface is connected to a rod cavity of each right suspension cylinder in the right suspension cylinder group, the pair of suspension valves The first interface of the right side suspension valve is in communication with the rodless cavity of each right suspension cylinder in the right suspension cylinder group, and the second interface and each left suspension in the left suspension cylinder group a rod cavity of the oil cylinder is connected, the left side The accumulator ports of the suspension valve and the right suspension valve are connected to the left accumulator and the right accumulator, respectively.

Further, the present invention provides an engineering vehicle including the above-described oil and gas suspension system.

Through the above technical solution of the present invention, the invention realizes the priority lifting function of the axle suspension system through effective oil circuit design; the rigid flexible working condition of the suspension system is more reliably realized by using the differential pressure sensing logic control component group. Long-term maintenance and reliable and fast conversion of rigid flexible working conditions; At the same time, various components of the suspension valve of the axle suspension system are effectively reduced, and the problems of complicated control, complicated logic relationship, etc. caused by the prior art are avoided, and the suspension system is improved. The simplicity of control. Other features and advantages of the invention will be described in detail in the detailed description which follows. DRAWINGS The drawings are intended to provide a further understanding of the invention, and are intended to be a In the drawing:

1 is a schematic structural view of a prior art oil and gas suspension system;

2 is a schematic view showing the principle of a suspension valve according to an embodiment of the present invention;

Figure 3 is a schematic diagram of a conventional installation of a suspension valve applied to an oil and gas suspension system;

4 is a schematic view of a novel connection structure of a suspension valve according to an embodiment of the present invention;

Fig. 5 is a schematic view showing a grouping arrangement structure of an oil and gas suspension system according to an embodiment of the present invention. Description of the reference signs:

I Pressure oil source 2 PLC or microcomputer control unit

3 fuel tank 4 front right accumulator

5 front left accumulator 6 position sensor

7 front left suspension cylinder 8 front left suspension valve

9 front right side suspension valve 10 front right side suspension cylinder

II Position Sensor 12 Position Sensor

13 Rear left suspension cylinder 14 Front left suspension valve

15 rear left accumulator 16 rear right side suspension valve

17 rear right accumulator 18 rear right suspension cylinder

19 position sensor 20 electronically controlled pneumatic valve

21 Oil return switch lock valve 22 Oil inlet lock valve

23 Logic Shuttle Valve 24 Differential Pressure Sensing Lock Valve

25 pilot control valve

A1 first interface A2 second interface

A3 third interface X control interface SP accumulator interface inlet

T return port

W wheel vehicle center of gravity

F frame front axle group

BG rear axle group axle

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are intended to be illustrative and not restrictive.

It should be noted that the following orientation words used for clarity and convenience, such as the front left side, the front right side, the rear left side, and the rear right side, are all the same as the actual installation of the oil and gas suspension system to the construction vehicle. It is not intended to limit the scope of the invention.

Referring to Fig. 1, Fig. 1 shows a general installation form of a suspension valve in an oil and gas suspension system, in which each side of the axle A is symmetrically provided with suspension cylinders 7, 10, and the upper ends of the suspension cylinders 7, 10 are hinged. On the frame F or the body, the lower end is hinged to the corresponding axle A, and each pair of suspension cylinders 7, 10 is connected with a matching suspension valve 8, 9 and an accumulator 4, 5.

2 shows a suspension valve according to an embodiment of the present invention, the suspension valve comprising: an oil inlet switch lock valve 22 connected to an oil inlet P and a second interface A2 of the suspension valve Between the second interface A2 for connecting the rod cavity of the suspension cylinder; the oil return switch lock valve 21, the oil return switch lock valve 21 is connected to the return port T of the suspension valve and the first interface A1 Between the first interface A1 for connecting the rodless cavity of the suspension cylinder; the differential pressure sensing logic control component group, the differential pressure sensing logic control component group comprises a logic shuttle valve 23 and a differential pressure sensing locking valve 24 And a pilot control valve 25, wherein the oil outlet of the logic shuttle valve 23 is connected to the first interface A1 and the accumulator interface SP of the suspension valve, respectively, the accumulator interface SP via the differential pressure sensing lock valve 24 One side chamber is connected to the second interface A2, and one side chamber of the differential pressure sensing lock valve 24 is also connected to the first interface Al, when the differential pressure sensing lock valve 24 is locked, the accumulator interface SP is disconnected from the first interface A1 oil passage, and the other side chamber of the differential pressure sensing lock valve 24 The chamber is connected to the oil outlet of the logic shuttle valve 23 and the oil return port T via a pilot control valve 25, and the pilot control valve 25 selectively causes the other side chamber of the differential pressure sensing lock valve 24 to be connected to the logic shuttle valve The oil outlet of the 23 or the oil return port T is in communication, and the pilot control port of the pilot control valve 25 is connected to the control interface X of the suspension valve.

Wherein, the oil return switch lock valve 21 adopts an electronically controlled electromagnetic valve to realize the oil return opening and locking function; the oil inlet switch lock valve 22 adopts an electronically controlled electromagnetic valve to realize the oil inlet opening and locking function; the logic shuttle valve 23 is suspended. The pressure cylinder has a pressure logic comparison of the rod cavity; the differential pressure sensing lock valve 24 realizes the pressure difference pressure sensing and the communication lock of the suspension cylinder with or without the rod cavity; the pilot control valve 25 realizes whether the suspension cylinder has a rod cavity Connectivity and locking. The logic shuttle valve 23, the differential pressure sensing lock valve 24, and the pilot control valve 25 form a differential pressure sensing logic control element group.

Preferably, the pilot control valve 25 is a pneumatic pilot control valve, and the control interface X of the suspension valve is connected to a source of pressurized gas.

Referring to FIG. 3, FIG. 3 shows a conventional installation form of the suspension valve of the present invention. The suspension system of FIG. 3 includes an oil source 1, a PLC or a microcomputer control unit 2, a fuel tank 3, and an accumulator 4, 5, 15, 17. Suspension cylinders 7, 10, 13, 18, suspension valves 8, 9, 14, 16, position sensors 6, 11, 12, 19 and other components. The oil and gas suspension system shown in FIG. 3 adopts a well-known cross-installation form, each pair of suspension cylinders (for example, a front left suspension cylinder 7 and a front right suspension cylinder 10; and a rear left suspension cylinder 13 and The rear right suspension cylinder 18) is provided with a pair of suspension valves, wherein the cross-connection relationship is well known, and the corresponding control logic relationship is also well known to those skilled in the art, and will not be described again, mainly by various work. The PLC or the microcomputer control unit 2 controls the suspension valve and the oil path to realize the extension and retraction of the vehicle suspension cylinder or the leveling position locking, thereby satisfying various suspension requirements of the vehicle.

Fig. 4 shows a mounting form of a renewed type hydro-pneumatic suspension system using the suspension valve of the present invention (the above-described interface connection relationship of the known cross-installation type can also be referred to the mounting form).

Referring to FIG. 4, the oil and gas suspension system includes at least one pair of the above suspension valves, the at least one pair of suspensions The valve is connected with a matching left suspension cylinder group and a right suspension cylinder group, wherein the left suspension cylinders of the left suspension cylinder group have a rod cavity communicating with each other, and each left suspension The rodless chambers of the cylinders 7 are also in communication with each other, and the rod cavities of the respective right side suspension cylinders 10 in the right side suspension cylinder group are in communication with each other, and the rodless chambers of the respective right side suspension cylinders 10 are also in communication with each other. The first interface A1 of the left suspension valve 8 of the pair of suspension valves is in communication with the rodless cavity of each of the left suspension cylinders 7 in the left suspension cylinder group, and the second interface A2 is a rod cavity of each of the right suspension cylinders 10 in the right suspension cylinder group, a first interface A1 of the right suspension valve of the pair of suspension valves and each of the right suspension cylinder groups The rodless chamber of the side suspension cylinder 10 is in communication, and the second port A2 is in communication with the rod chamber of each of the left suspension cylinders 7 in the left suspension cylinder group, the left side suspension valve and the right side suspension valve The accumulator interfaces SP are connected to the left accumulator 5 and the right accumulator 4, respectively.

Referring to Figure 4, the first port A1 of the suspension valve is connected to the rodless cavity of the suspension cylinder, the second port A2 is connected to the rod cavity of the suspension cylinder, the accumulator port SP is connected to the accumulator, P is the oil inlet, T For the return port, the control interface X is connected to the pneumatic control air supply.

Preferably, the control interface X is connected to the source of pressurized air by an electrically controlled pneumatic valve 20.

When the P port pressure oil communicates with the second port A2 through the oil inlet switch lock valve 22 and the second port A2, the T port oil returns to the suspension port through the oil return switch lock valve 21 and the first port A1. The rodless cavity achieves the priority retraction function of the suspension cylinder, which realizes the priority lifting function of the axle suspension system.

When the oil inlet switch lock valve 22 and the oil return switch lock valve 21 are locked, the control interface X turns on the pressure air source, so that the pilot control valve 25 connects the control port of the differential pressure sensing lock valve 24 to the fuel tank 3 The presence or absence of the rod cavity pressure of the suspension cylinder simultaneously pushes the differential pressure sensing lock valve 24 to communicate with the rod cylinder, the rodless chamber and the accumulator of the suspension cylinder, and can stably and directly suspend when the air pressure changes. The flexible function of the rack system.

When the oil inlet switch lock valve 22 and the oil return switch lock valve 21 are locked, the control interface X is connected to the atmospheric air source, so that the pilot control valve 25 connects the control port of the differential pressure sensing lock valve 24 to the suspension. Rack The cylinder has a rod cavity and a rodless cavity, and the rod chamber and the rodless chamber pressure of the suspension cylinder simultaneously act to push the differential pressure sensing lock valve 24, thereby making the rodless cavity and the rod cavity of the suspension cylinder The two oil passages of the accumulator are closed at the same time, so the rigidity of the suspension system is stably and reliably realized.

In the above-described installation form of the hydro-pneumatic suspension system, since it includes the left suspension cylinder group and the right suspension cylinder group, the grouping of the front and rear suspension cylinders of the vehicle can be realized according to the position of the center of gravity of the vehicle.

Referring to FIG. 5, a grouping arrangement of an oil and gas suspension system of a five-axle vehicle according to a position of a center of gravity of a vehicle is shown, wherein a vehicle center of gravity position G (ie, a centroid position of the vehicle) is located between the front bridge group FG and the rear bridge group BG, The bridge group FG comprises two axles, and the rear axle group BG comprises three axles, that is to say, the number of axles of the rear axle group BG is one more than the number of axles of the front axle group FG. More specifically, the main technical idea of the grouping arrangement structure of the oil and gas suspension system of the present invention is as follows: the upper end of the suspension cylinder of the oil and gas suspension system is hinged on the frame or the vehicle body, and the lower end is hinged on the corresponding axle ( That is, the suspension cylinders are symmetrically arranged on both sides of each axle, wherein the axle includes a front axle group FG and a rear axle group BG, and the center of gravity position G of the vehicle is located in the front bridge group FG and the rear bridge group Between the BGs, and the number of axles of the rear axle group BG is equal to the number of axles of the front axle group FG, or only one axle more than the number of axles of the front axle group FG. Thus, after the oil and gas suspension system adopts the above grouping arrangement, the corresponding front left suspension cylinder group and front right suspension cylinder group can be installed by using a pair of suspension valves as shown in FIG. 4, similarly, The rear left suspension cylinder group and the rear right suspension cylinder group can also be mounted using a pair of suspension valves as shown in FIG. That is to say, the function is realized as described with reference to Fig. 4, which simultaneously realizes the control of the rigid flexible switching function of the suspension system, and the object of control changes from a single suspension cylinder to a group suspension cylinder.

As can be seen from the above description, the present invention realizes the priority lifting function of the axle suspension system through effective oil circuit design; and realizes the long-term maintenance of the rigid flexible working condition of the suspension system by using the differential pressure sensing logic control component group more reliably. Reliable and fast conversion of rigid flexible working conditions; effectively reducing various components of the suspension valve of the axle suspension system, avoiding the complicated control and logical relationship caused by the prior art Miscellaneous problems improve the simplicity of suspension system control. In addition, in the preferred embodiment, by increasing the electronically controlled pneumatic valve 20, the air pressure control of the control interface X of the suspension valve is realized, and at the same time, the control of the rigid flexible switching function of the suspension system is realized, and the object of control is changed from a single suspension cylinder. In order to group the suspension cylinders, the control interface is simpler and the control is more convenient.

At the same time, the suspension system of the invention adopts the left and right cross control connection, and the front and rear grouping according to the position of the center of gravity of the vehicle before and after, better supporting the frame and the body of the engineering vehicle, realizing the axle load balancing function of the suspension system, and Conducive to the realization of the fast leveling function.

It should be noted that each of the specific technical features described in the above specific embodiments may be combined in any suitable manner, and it is also within the scope of the present disclosure. In addition, any combination of various embodiments of the present invention may be made as long as it does not deviate from the idea of the present invention, and it should be regarded as the disclosure of the present invention.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments, and various simple modifications of the technical solutions of the present invention may be made within the scope of the technical idea of the present invention. These simple variations are within the scope of the invention. For example, the PLC or the microcomputer control unit 2 can be constituted by other control elements such as a single chip microcomputer and an electronic component; the control mode of the pilot control valve can be realized by electronic control, air control, and hydraulic control; before and after the suspension cylinder is performed. In the case of grouping, by connecting the rod cavities of the suspension cylinders in the front and rear groups to each other and causing the rodless chambers to communicate with each other, the function of the suspension system can be realized by only using a pair of suspension valves. The scope of the invention is defined by the claims.

Claims

Rights request

A suspension valve, characterized in that the suspension valve comprises:

An oil inlet switch lock valve (22), the oil inlet lock valve (22) is connected between the oil inlet (P) and the second port (A2) of the suspension valve;

a return switch lock valve (21), the return switch lock valve (21) is connected between the return port (T) of the suspension valve and the first port (A1);

a differential pressure sensing logic control component group, the differential pressure sensing logic control component group comprising a logic shuttle valve (23), a differential pressure sensing lock valve (24), and a pilot control valve (25), wherein the logic shuttle valve The oil inlets of (23) are respectively connected to the first interface (A1) and an accumulator interface (SP) of the suspension valve, and the accumulator interface (SP) via the differential pressure sensing lock valve a side chamber of (24) is connected to the second interface (A2), and a side chamber of the differential pressure sensing lock valve (24) is further connected to the first interface (A1), When the differential pressure sensing lock valve (24) is locked, the accumulator interface (SP) is disconnected from the first interface (A1) oil passage, and the differential pressure sensing lock valve (24) The other side chamber is connected to the oil outlet of the logic shuttle valve (23) and the oil return port (T) via the pilot control valve (25), the pilot control valve (25) selectively making The other side chamber of the differential pressure sensing lock valve (24) is in communication with the oil outlet of the logic shuttle valve (23) or the oil return port (T), and the pilot control valve (25) Pilot A control port is connected to the control interface (X) of the suspension valve.

2. The suspension valve according to claim 1, wherein the oil inlet switch lock valve (22) and the oil return switch lock valve (21) are electronically controlled switching valves.

3. Suspension valve according to claim 1, characterized in that the pilot control valve (25) is a pneumatically controlled pilot control valve.

An oil and gas suspension system, characterized in that the oil and gas suspension system comprises at least one pair of suspension valves according to claim 1, each of the at least one pair of suspension valves being connected with a matching left suspension cylinder group and a right suspension cylinder group, wherein the rod cavities of the respective left suspension cylinders (7) in the left suspension cylinder group are in communication with each other, and the rodless cavities of the respective left suspension cylinders (7) are also mutually Connected, the rod cavities of the right suspension cylinders (10) in the right suspension cylinder group are in communication with each other, and the rodless cavities of the respective right suspension cylinders (10) are also in communication with each other, wherein the one The first interface (A1) of the left suspension valve (8) in the suspension valve is in communication with the rodless cavity of each of the left suspension cylinders (7) in the left suspension cylinder group, and the second interface (A2) a communicating with a rod cavity of each right suspension cylinder (10) in the right suspension cylinder group, a first interface (A1) of the right suspension valve (9) of the pair of suspension valves Rodless cavity of each right suspension cylinder (10) in the right suspension cylinder group Connected, the second interface (A2) is in communication with a rod cavity of each of the left suspension cylinders (7) in the left suspension cylinder group, the left suspension valve (8) and the right suspension valve

The accumulator interface (SP) of (9) is connected to the left accumulator (5) and the right accumulator (4).

5. The oil and gas suspension system according to claim 4, wherein the left suspension cylinder group and the right suspension cylinder group are grouped before and after according to a gravity center position of the vehicle, wherein upper ends of the respective suspension cylinders are hinged at On the frame (F) or the vehicle body, the lower end is hinged on a corresponding axle, the axle includes a front axle group (FG) and a rear axle group (BG), and the center of gravity (G) of the vehicle is located in front of the vehicle Between the bridge group (FG) and the rear bridge group (BG).

6. The oil and gas suspension system according to claim 5, wherein the number of axles of the rear axle group (BG) is equal to the number of axles of the front axle group (FG), or only the former The bridge group (FG) has one more axle.

7. The oil and gas suspension system according to claim 4, wherein the pilot control valve (25) is a pneumatic pilot control valve, and the control interface (X) of the suspension valve is connected to the pressure gas Source.

8. The oil and gas suspension system according to claim 7, wherein the control interface (X) of the suspension valve is connected to the pressure gas source via an electrically controlled pneumatic valve (20).

9. An oil and gas suspension system, characterized in that the oil and gas suspension system comprises a pair of suspension valves according to claim 1, each pair of said suspension valves being respectively connected with a matching left suspension cylinder (7) , 13) and a right suspension cylinder (10, 18), wherein the first interface (A1) of the left suspension valve (8, 14) of the pair of suspension valves and the corresponding left suspension cylinder (7, 13) without rod cavity communication, the second interface (A2) is in communication with the corresponding rod cavity of the right suspension cylinder (10, 18), and the right side suspension valve of the pair of suspension valves The first interface (A1) of (9, 16) is in communication with the rodless chamber of the corresponding right suspension cylinder (10, 18), and the second interface (A2) is associated with the corresponding left suspension cylinder ( 7, 13) has a rod cavity communication, and the accumulator ports (SP) of the left side suspension valve (8, 14) and the right side suspension valve (9, 16) are respectively connected to the left side accumulator (5, 15) and right accumulator (4, 17).

10. The oil and gas suspension system according to claim 9, wherein the pilot control valve (25) is a pneumatically controlled pilot control valve, and the control interface (X) of the suspension valve is connected to a pressure gas source .

An engineering vehicle, characterized in that the construction vehicle comprises the oil and gas suspension system according to any one of claims 4 to 10.