An air control system for an air suspension system with a lift axle

Abstract

The present invention discloses a gas control system for an air suspension system with a lift axle, which includes an air storage tank, a solenoid valve, lift air bags, relay valves, load-carrying air bags, height valves, and drive air bags. The air storage tank is divided into two paths through a tee joint. One path is connected to the solenoid valve, and the solenoid valve is respectively connected to two lift air bags and two relay valves. Each relay valve is connected to a load-carrying air bag to achieve one-to-one control. The other path is connected to two height valves, and each height valve is respectively connected to a drive air bag on one side to achieve one-to-one control. Each height valve is also connected to one of the relay valves through a series-connected high-pressure limiting valve and low-pressure limiting valve. The present invention can more precisely control the heights of the left and right load-carrying air bags and drive air bags, prevent the deformation of the air bags, avoid rollover when fully loaded, and can also make the same side synchronous when the lift axle is carrying a load, with higher safety performance.

Description

Technical Field

[0001] The present invention relates to the technical field of air suspension, and particularly relates to a gas control system for an air suspension system with a lift axle. Background Art

[0002] The design of air suspension installed on trucks has developed relatively late in China. Currently, the gas control system of the air suspension system with a lift axle on trucks is as Figure 1 shown, including an air storage tank 1', a solenoid valve 2', a lift airbag 3', a relay valve 4', a load-bearing airbag 5', a height valve 6', and a drive airbag 7'. The air storage tank 1' is divided into two paths through a tee 8'. One path is connected to the solenoid valve 2'. One port of the solenoid valve 2' is connected to two lift airbags 3' arranged on both sides of the vehicle frame through a tee respectively. Another port of the solenoid valve 2' is connected to the relay valve 4'. The relay valve 4' is connected to two load-bearing airbags 5' arranged on both sides of the vehicle frame through a tee respectively. The other path is connected to a height valve 6'. One port of the height valve 6' is connected to two drive airbags 7' arranged on both sides of the vehicle frame through a tee respectively. There are two drive airbags on each side of the vehicle frame. The other port of the height valve 6' is connected to the relay valve 4'. The lift airbag of the lift axle is a bladder airbag, and the load-bearing airbag and the drive airbag are diaphragm airbags.

[0003] This gas control system of the air suspension system with a lift axle has the following relatively serious situations when driving under various working conditions of no-load or full-load: (1) When the lift axle is lowered to play a load-bearing role, in the initial stage of inflation, when the air pressure in the drive airbag 7' of the rear axle is weak, the air in the load-bearing airbag of the lift axle quickly enters, and it quickly rises, with the potential risk of jacking up the vehicle frame and forming a situation where it is high in the middle and low on both sides; (2) The four drive airbags on both sides of the vehicle frame are only controlled by one height valve. If the swing arm of the height valve swings slightly, it will cause the air pressures in the drive airbags on both sides to be inconsistent. During the vehicle driving process, the whole vehicle always rolls, and it is difficult to adjust the synchronization on both sides; (3) The load-bearing airbags on both sides of the vehicle frame are controlled by one relay valve. Due to the slightly uneven distribution of the load on both sides, the load-bearing airbags on both sides may not intake air synchronously, or the heights are inconsistent, affecting the air pressure and height of the subsequent drive airbags; (4) Taking a 5T lift axle as an example, the designed maximum air pressure of the load-bearing airbag is not greater than 0.5 Mpa, but the actual maximum air pressure reaches 0.85 Mpa, exceeding the design pressure, which makes the load-bearing airbag dangerous and has a short service life; (5) When a fully loaded vehicle turns, it rolls. The load on the inner load-bearing airbag increases. When the height remains unchanged, the air pressure rises. When it resumes straight driving, the load returns to normal. To keep the height of the load-bearing airbag unchanged, the air pressure needs to be reduced, but the excess gas cannot be discharged, resulting in the deformation of the airbag. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a gas control system for an air suspension system with a lift axle.

[0005] For this reason, the technical solution of the present invention is a gas control system for an air suspension system with a lift axle, including an air storage tank, a solenoid valve, a lift airbag, a relay valve, a load-bearing airbag, a height valve, and a drive airbag. The air storage tank is divided into two paths through a tee. One path is connected to the solenoid valve, and the solenoid valve is respectively connected to the lift airbag and the relay valve, and the relay valve is connected to the load-bearing airbag; the other path is connected to the height valve, and the height valve is respectively connected to the drive airbag and the relay valve. It is characterized in that:

[0006] There are two relay valves, and one relay valve is connected to one load-bearing airbag to achieve one-to-one control;

[0007] There are two height valves. One height valve is connected to the drive airbag arranged on one side of the vehicle frame, and the other height valve is connected to the drive airbag on the other side of the vehicle frame;

[0008] One height valve is correspondingly connected to one relay valve, and a high-pressure limiting valve and a low-pressure limiting valve are also arranged on the pipeline between the height valve and the relay valve.

[0009] A further improvement lies in that: a safety valve is additionally arranged on the air outlet port of the load-bearing airbag.

[0010] A further improvement lies in that: there are two drive airbags, one is arranged on each side of the vehicle frame.

[0011] Beneficial effects:

[0012] After the optimization design of the present invention, the defects existing in the prior art are eliminated.

[0013] Both the height valve and the relay valve are changed from originally one simultaneously controlling the air intake of the left and right drive airbags and the load-bearing airbag to being separately controlled by two height valves and relay valves. It can more precisely control the height of the left and right airbags, avoid rollover when fully loaded, and also make the same side synchronous when the lift axle is carrying;

[0014] A low-pressure limiting valve and a high-pressure limiting valve are added between the height valve and the relay valve, so that at the initial stage of inflation, the drive airbag is ensured to intake air first. When the air pressure in the drive airbag reaches a certain air pressure value, the load-bearing airbag of the lift axle starts to inflate. The high-pressure limiting valve limits the maximum air pressure to prevent the airbag from being overloaded;

[0015] A safety valve is added to the air outlet port of the load-bearing airbag. The safety air pressure of the safety valve is adapted to the maximum pressure of the load-bearing airbag. When the height of the airbag remains unchanged and the air pressure of the load-bearing airbag is slightly higher due to special circumstances, causing the deformation of the load-bearing airbag, the air is released through the safety valve to ensure that the load-bearing airbag returns to its original position;

[0016] The number of drive airbags is adjusted from 4 in the past to 2 airbags, reducing the cost on the premise of ensuring safety. Description of the drawings

[0017] Figure 1 It is a schematic diagram of the air control system of the prior art.

[0018] Figure 2 It is a schematic diagram of the air control system of the present invention.

[0019] As shown in the figure: 1. Air storage tank; 2. Solenoid valve; 3. Lifting airbag; 4. Relay valve; 5. Load-bearing airbag; 6. Height valve; 7. Driving airbag; 8. Three-way joint; 9. High-pressure limiting valve; 10. Low-pressure limiting valve; 11. Safety valve. Specific implementation mode

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings, but this embodiment should not be construed as a limitation to the present invention.

[0021] The present invention is as Figure 2 shown:

[0022] An air control system for a lifting axle air suspension system, comprising an air storage tank 1, a solenoid valve 2, a lifting airbag 3, a relay valve 4, a load-bearing airbag 5, a height valve 6 and a driving airbag 7. The solenoid valve 2 is a two-position five-way solenoid valve, and the solenoid valve is controlled by a button provided on the vehicle body dashboard. The air storage tank 1 is divided into two paths through a three-way joint 8. One path is connected to the solenoid valve 2 through a pipeline, and the solenoid valve 2 is respectively connected to the lifting airbag 3 and two relay valves 4 arranged on both sides of the vehicle frame through pipelines. Each relay valve 4 is connected to a load-bearing airbag 5 arranged on both sides of the vehicle frame through a pipeline to achieve one-to-one connection; the other path is connected to two height valves 6 through a three-way joint. Each height valve 6 is respectively connected to a driving airbag 7 arranged on both sides of the vehicle frame, and the two height valves 6 are also respectively connected to the two relay valves through pipelines to achieve one-to-one connection. A high-pressure limiting valve 9 and a low-pressure limiting valve 10 are connected to the pipeline between the height valve 6 and the relay valve 4;

[0023] A safety valve 11 is additionally provided at the air outlet port of the load-bearing airbag 5.

[0024] The working principle of the present invention:

[0025] When the button on the vehicle body dashboard is in the up-pressed (popped-up) state, the load-bearing airbag 5 of the lifting axle will start to inflate. Airflow is output from port a of the two-position five-way solenoid valve 2 to port a of the relay valve 4. When the air pressure in the driving airbag 7 reaches the opening air pressure of the low-pressure limiting valve, the airflow output from port b of the height valve 6 passes through the low-pressure limiting valve 10 and the high-pressure limiting valve 9 in sequence to reach port b of the relay valve 4. When there is airflow at both port a and port b of the relay valve 4 simultaneously, airflow passes through the pipeline from the air outlet port c of the relay valve 4 connected to the load-bearing airbag into the load-bearing airbag 5. When the required height of the whole vehicle is reached and the air pressure in the load-bearing airbag does not exceed the set value, it remains balanced and the height valve is in the balanced position;

[0026] When the button on the vehicle body dashboard is pressed, air flows out of port b of the five-port two-way solenoid valve 2, and port a of the five-port two-way solenoid valve 2 will be in a closed state with no air flow. At this time, the load-bearing airbag 5 deflates through the relay valve 4, and the load-bearing airbag 5 contracts; meanwhile, when the five-port two-way solenoid valve 2 inflates the lifting airbag 3 through port b and reaches the lifting height and air pressure balance state, the height valve is in the balanced position and stops inflating and deflating;

[0027] When the button is pressed again, port b of the five-port two-way solenoid valve 2 is in a closed state with no air flow, and air will flow out of port a. The lifting airbag 3 deflates through the five-port two-way solenoid valve 2, and the lifting airbag 5 contracts, and the initial state is cycled again;

[0028] The height valve 6 adjusts the air pressure and height of the drive airbag 7 according to the load of the rear axle, so that the height of the whole vehicle remains unchanged under any working conditions and loads.

[0029] Matters not described in detail in this specification are well-known techniques in the art.

[0030] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An air control system for a lift axle air suspension system, comprising an air storage tank, a solenoid valve, a lift airbag, a relay valve, a load-carrying airbag, a height valve and a drive airbag. The air storage tank is divided into two paths through a tee. One path is connected to the solenoid valve, and the solenoid valve is respectively connected to the lift airbag and the relay valve, and the relay valve is connected to the load-carrying airbag; the other path is connected to the height valve, and the height valve is respectively connected to the drive airbag and the relay valve. It is characterized in that: There are two relay valves, and one relay valve is connected to one load-bearing airbag to achieve one-to-one control; There are two height valves, one of which is connected to the drive airbag installed on one side of the vehicle frame, and the other height valve is connected to the drive airbag on the other side of the vehicle frame; One of the height valves is correspondingly connected to one relay valve, and a high-pressure limiting valve and a low-pressure limiting valve are also provided on the pipeline between the height valve and the relay valve; A low-pressure limiting valve and a high-pressure limiting valve are added between the height valve and the relay valve, so that at the initial stage of inflation, the drive airbag is ensured to intake air first. When the air pressure in the drive airbag reaches a certain value, the load-bearing airbag starts to inflate. The high-pressure limiting valve limits the maximum air pressure to prevent the load-bearing airbag from being overloaded.

2. The air control system for a lift axle air suspension system according to claim 1, characterized in that: A safety valve is additionally provided on the air outlet port of the load-bearing airbag.

3. The air control system for a lift axle air suspension system according to claim 1 or 2, characterized in that: There are two drive airbags, one is installed on each side of the vehicle frame.

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