CN220581576U - Cab air spring - Google Patents

Abstract

The utility model discloses a cab air spring, which comprises a damping adjustable damper, an air spring upper seat, a dust cover, a bag cover, an air spring lower cover, a buckling ring, a stay wire, a pressing plate, a stand column, a connecting shaft, an adjusting nut, a first valve core, a spring, a second valve core, a valve body, a sealing ring, an air inlet, an air outlet, a connecting channel, an outer interface and an air storage tank, wherein the damping adjustable damper is arranged on the air spring upper seat; compared with the existing air spring, the air spring provided with the self-adaptive adjusting device has self-adaptive adjusting capability, the damping force value of the damper can be automatically adjusted according to the road surface bumping degree, and the special induction mode can greatly reduce the reaction time and make adjustment more quickly; meanwhile, the self-adaptive adjusting device is arranged in the device, so that not only can the interference of the external environment be prevented, but also the damage of the elements caused by the external environment can be prevented, the service life of the elements can be prolonged, and a large amount of space can be saved for deploying other elements in terms of space utilization.

Description

Cab air spring

Technical Field

The utility model relates to the field of air springs, in particular to a self-adaptive adjusting device.

Background

The self-adaptive adjusting device is based on a small part of application of patent CN202320909742.0 in the air spring, and the self-adaptive adjusting device is designed to the greatest extent to realize the self-adaptive adjustment of the air spring. The self-adaptive adjusting device moves up and down or changes the inflation quantity along with the air spring, so that the opening and closing of each air valve are changed to realize the self-adaptive adjustment of the air spring, and the damping force value of the damper is changed by adjusting the inflation quantity of the control unit, so that the buffering and damping effects of the air spring are improved.

The self-adaptive adjusting device not only solves the self-inflating and air-exhausting suspension function of the air spring, but also realizes the self-adaptive adjustment of the damping force of the air spring, and has higher reaction speed, so that the air content in the self-adaptive adjusting device is always kept within an optimal range. The lever is also used for realizing one-lever double control and controlling the inflation amount of the air spring and the control unit.

Disclosure of Invention

The present utility model has been made in view of the above problems, and it is an object of the present utility model to provide a cab air spring that overcomes or at least partially solves the above problems.

According to one aspect of the utility model, a cab air spring is provided, and the cab air spring internally comprises a damping adjustable damper, and is characterized by comprising the damping adjustable damper, an air spring upper seat, a dust cover, a capsule shell, an air spring lower cover, a buckling ring, a pull wire, a pressing plate, a stand column, a connecting shaft, an adjusting nut, a first valve core, a spring, a second valve core, a valve body, a sealing ring, an air inlet, an air outlet, a connecting channel, an outer interface and an air storage tank;

the right end part of the damping adjustable damper is a control unit, the cab air spring upper seat is fixedly connected with the top of the damping adjustable damper, and the air spring lower cover is fixedly connected with the bottom of the damping adjustable damper;

the first valve core is of a special hollow structure;

the sealing rings are divided into a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring;

the small holes are formed in the bottom of the air storage tank, so that air in the air storage tank can be slowly discharged.

Preferably, the control unit of the damping adjustable damper is connected with the external interface through the air storage tank, the damping force change of the damping adjustable damper is related to the relative displacement between the upper seat of the cab air spring and the lower cover of the cab air spring, and the damping force change rate of the damping adjustable damper is also related to the inflation amount of the control unit.

Preferably, one end of the stay wire is fixedly connected with the cab air spring upper seat, and the other end of the stay wire is fixedly connected with one end of the pressing plate.

Preferably, the pressing plate is adaptively connected with the upright post through the connecting shaft, and the pressing plate can rotate around the connecting shaft under the action of the stay wire;

when the piston rod of the damping adjustable damper extends upwards, the upper seat of the air spring of the cab is driven to move upwards, one end of the pressing plate is pulled to move upwards through the stay wire, the other end of the pressing plate moves downwards under the action of the connecting shaft, the first valve core and the second valve core are pressed to move downwards, and gas in the air spring of the cab is discharged through the exhaust port; the method comprises the steps of carrying out a first treatment on the surface of the

When the damping adjustable damper piston rod is compressed downwards, the cab air spring upper seat is driven to move downwards, the stay wire between the cab air spring upper seat and the pressing plate is relaxed, and the first valve core and the second valve core move upwards under the action of spring force.

Preferably, the upright post is adaptively connected with the adjusting nut through a preset hole position at the bottom of the cab air spring, and the position of the upright post in the lower cover of the cab air spring can be adjusted by rotating the adjusting nut, so that the position of the pressing plate in the cab air spring is adjusted, and the height of the cab air spring is adjusted.

Preferably, the cab air spring has three states, namely a balanced state, an inflated state and an exhausted state.

Preferably, when the pressure plate is kept in a horizontal state under the action of the stay wire, the cab air spring enters a balanced state, and the first valve core and the second valve core are at balanced positions;

at the moment, the gas in the gas inlet is limited by the first sealing ring through the valve body and cannot enter the air bag to complete inflation, and the gas in the air bag is limited by the second sealing ring through the inside of the first valve core and cannot enter the gas outlet to complete gas discharge;

at this time, the gas in the gas inlet passes through the connecting channel and is limited by the third sealing ring, and cannot enter the outer interface to complete the inflation of the control unit.

Preferably, when one end of the pressing plate is jacked up by the first valve core to be higher than the horizontal position, the cab air spring enters an inflated state, and at the moment, the first valve core and the second valve core are in an ascending state;

at the moment, the gas in the gas inlet passes through the valve body and enters the air bag to complete inflation, and at the moment, the gas in the air bag passes through the inside of the first valve core and is limited by the second sealing ring and cannot enter the gas outlet to complete gas discharge;

if the third sealing ring does not cross the connecting channel, the gas in the gas inlet passes through the connecting channel and is limited by the third sealing ring, so that the gas cannot be inflated; if the third sealing ring passes through the connecting channel, the gas in the gas inlet passes through the connecting channel and enters the outer interface to complete the inflation.

Preferably, when one end of the pressing plate is pulled up by the pull wire to be higher than the horizontal position, the cab air spring enters an exhaust state, and the first valve core and the second valve core are in a descending state;

at the moment, the gas in the gas inlet passes through the valve body and is limited by the first sealing ring, and can not enter the air bag to complete inflation, and at the moment, the gas in the air bag passes through the first valve core and enters the gas outlet to complete gas discharge;

at this time, if the third sealing ring does not pass through the external interface, the gas in the gas inlet passes through the connecting channel and is limited by the third sealing ring, so that the gas cannot be inflated; if the third sealing ring passes over the outer interface, the gas in the gas inlet passes through the connecting channel and enters the outer interface to complete the inflation.

The beneficial effects of the utility model are as follows: compared with the existing air springs, the self-adaptive adjusting device arranged on the air springs has self-adaptive adjusting capability, can automatically adjust the content of the air in the air springs along with the height of the air springs, and has a special sensing mode, so that the reaction time can be greatly reduced, and the air springs can be adjusted more quickly; meanwhile, the self-adaptive adjusting device is built in, so that the interference of the external environment to the self-adaptive adjusting device can be prevented, the precision is improved, the damage of elements caused by the external environment can be prevented, the service life is prolonged, a large amount of space can be saved in the aspect of space utilization, other elements can be deployed, and the self-adaptive adjusting device is higher in adaptability.

The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present utility model more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 shows a perspective view of a cab air spring;

FIG. 2 shows a perspective view of a cab air spring without a dust cover;

FIG. 3 shows a fixed view of the adaptive adjustment device;

FIG. 4 shows a partial enlarged view of the adaptive adjustment device securing structure;

fig. 5 shows a perspective view of the adaptive adjustment device;

FIG. 6 shows a perspective view of the cab air spring balance state valve body;

FIG. 7 shows a cross-sectional view B-B of the cab air spring balance valve body along the first spool;

FIG. 8 shows a cross-sectional view C-C of the cab air spring balance valve body along the second spool;

FIG. 9 shows a side-by-side cross-sectional view of the cab air spring balance valve body along the first and second spools;

FIG. 10 shows a perspective view of the valve body in a cab air spring inflated state;

FIG. 11 shows a cross-sectional view D-D of the cab air spring charge valve body along the first spool;

FIG. 12 shows a cross-sectional view F-F of the cab air spring charge valve body along a second spool;

FIG. 13 shows a side-by-side cross-sectional view of the cab air spring charge valve body along the first and second spools;

FIG. 14 shows a perspective view of the cab air spring exhaust state valve body;

FIG. 15 shows a cross-sectional view G-G of the cab air spring exhaust condition valve body along the first spool;

FIG. 16 shows a cross-sectional view I-I of the cab air spring exhaust condition valve body along a second spool;

FIG. 17 shows a side-by-side cross-sectional view of the cab air spring exhaust state valve body along the first and second spools;

reference numerals:

1. air spring

2. Damping adjustable damper

2-1, control unit

3. Air spring upper seat

4. Dust cover

5. Bag cover

6. Air spring lower cover

7. Buckling ring

8. Stay wire

9. Pressing plate

10. Upright post

11. Connecting shaft

12. Adjusting nut

13. First valve core

14. Spring

15. Second valve core

16. Valve body

17. Sealing ring

17-1, first sealing ring

17-2, second sealing ring

17-3, third sealing ring

17-4, fourth sealing ring

18. Air inlet

19. Exhaust port

20. Connection channel

21. External interface

22. Air storage tank

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Embodiment one:

according to one embodiment of the utility model, a cab air spring 1 is designed, fig. 1 shows a perspective view of the cab air spring, fig. 2 shows a dust cover-free perspective view of the cab air spring, fig. 3 shows a fixed view of an adaptive adjusting device, and as shown in fig. 1, fig. 2 and fig. 3, the cab air spring 1 internally comprises a damping adjustable damper 2, the cab air spring 1 comprises the damping adjustable damper 2, an air spring upper seat 3, a dust cover 4, a capsule 5, an air spring lower cover 6, a buckling ring 7, a stay wire 8, a pressing plate 9, a stand column 10, a connecting shaft 11, an adjusting nut 12, a first valve core 13, a spring 14, a second valve core 15, a valve body 16, a sealing ring 17, an air inlet 18, an air outlet 19, a connecting channel 20, an external interface 21 and an air storage tank 22;

specifically, the right end part of the damping adjustable damper 2 is a control unit 2-1, the cab air spring upper seat 3 is fixedly connected with the top of the damping adjustable damper 2, and the air spring lower cover 6 is fixedly connected with the bottom of the damping adjustable damper 2;

specifically, the first valve core 13 has a special hollow structure;

specifically, the sealing ring 17 is divided into a first sealing ring 17-1, a second sealing ring 17-2, a third sealing ring 17-3 and a fourth sealing ring 17-4, wherein the fourth sealing ring 17-4 refers broadly to a sealing ring which can not be ventilated at both sides in any case;

specifically, the small hole formed at the bottom of the air storage tank 22 can slowly discharge the air in the air storage tank 22, and this arrangement can ensure that the air in the air storage tank 22 is less and less without external air supplement until the air is balanced with the external air pressure.

It can be seen that the air spring is a collection module, and besides the necessary components of the traditional air spring, other components are integrated, including a damping adjustable damper, a self-adaptive adjusting device and an open-pore air storage tank.

In some embodiments of the present utility model, as shown in fig. 1, the control unit 2-1 of the damping adjustable damper 2 is connected to the external interface 21 through the air tank 22, the damping force variation of the damping adjustable damper 2 is related not only to the relative displacement between the cabin air spring upper seat 3 and the cabin air spring lower cover 6, but also to the inflation amount of the control unit 2-1.

Therefore, the air storage tank plays a role in slowing down the closing time of the air valve in the damper, and the small holes at the bottom of the air storage tank are designed, so that the problem that the control unit is damaged due to excessive inflation can be prevented.

In some embodiments of the present utility model, fig. 4 shows a partial enlarged view of the fixing structure of the adaptive adjusting device, as shown in fig. 3 and 4, one end of the pull wire 8 is fixedly connected to the cab air spring upper seat 3, and the other end of the pull wire 8 is fixedly connected to one end of the pressure plate 9.

Therefore, the design of the fixed end of the stay wire can ensure that the self-adaptive adjusting device moves along with the up-and-down movement of the air spring, the speed of the sensing mode is faster and more accurate, the self-adaptive adjusting device can adjust the air content in the air spring in real time, and meanwhile, the air charging amount of the control unit of the damping adjustable damper is changed in real time, so that the damping effect of the damping adjustable damper on the air spring is changed.

In some embodiments of the present utility model, fig. 5 shows a perspective view of an adaptive adjustment device, as shown in fig. 4 and 5, the pressure plate 9 is adaptively connected with the upright 10 through the connecting shaft 11, and the pressure plate 9 can rotate around the connecting shaft 11 under the action of the pull wire 8;

when the piston rod of the damping adjustable damper 2 extends upwards, the upper seat 3 of the air spring of the cab is driven to move upwards, one end of the pressing plate 9 is pulled to move upwards through the stay wire 8, the other end of the pressing plate 9 moves downwards under the action of the connecting shaft 11, the first valve core 13 and the second valve core 15 are pressed to move downwards, and gas in the air spring 1 of the cab is discharged through the exhaust port 19; the method comprises the steps of carrying out a first treatment on the surface of the

When the piston rod of the damping adjustable damper 2 is compressed downwards, the upper seat 3 of the cab air spring is driven to move downwards, the stay wire 8 between the upper seat 3 of the cab air spring and the pressing plate 9 is loosened, and the first valve core 13 and the second valve core 15 move upwards under the action of the elasticity of the spring 14.

Specifically, when one end of the pressing plate 9 moves upwards from the horizontal position under the action of the pull wire 8, the other end of the pressing plate 9 presses the first valve core 13 and the second valve core 15 downwards;

specifically, when one end of the pressing plate 9 moves downward when the pull wire 8 acts away from the horizontal position, the other end of the pressing plate 9 moves upward under the action of the first valve element 13 and the second valve element 15.

Therefore, when the stay wire drives the pressing plate to move up and down, the other end of the pressing plate drives the first valve core and the second valve core to move up and down, so that the change of the gas content and the change of the air pressure in the valve body and the control unit are controlled.

In some embodiments of the present utility model, as shown in fig. 4, the upright 10 is adaptively connected with the adjusting nut 12 through a preset hole position at the bottom of the cab air spring 1, and the position of the upright 10 in the cab air spring lower cover 6 can be adjusted by rotating the adjusting nut 12, so that the position of the pressure plate 9 in the cab air spring 1 is adjusted, and the height of the cab air spring 1 is adjusted.

Therefore, the length of the upright post positioned on the upper surface of the bottom of the air spring of the cab can be changed by rotating the adjusting nut, so that the balance position of the valve core is changed, and the purpose of changing the height of the air spring is achieved.

In some embodiments of the present utility model, as shown in fig. 3, the cab air spring 1 has three states, namely, a balanced state, an inflated state, and an exhausted state.

It can be seen that there are three adjustment states of the air spring.

In some embodiments of the utility model, fig. 6 shows a perspective view of the valve body in a balanced state of the cab air spring, fig. 9 shows a side-by-side cross-sectional view of the valve body in a balanced state of the cab air spring along the first and second valve spools, as shown in fig. 6 and 9, when the pressure plate 9 is kept in a horizontal state by the wire 8, the cab air spring 1 is brought into a balanced state, and the first and second valve spools 13 and 15 are at a balanced position;

specifically, fig. 7 shows a cross-sectional view B-B of the valve body of the air spring in the cab along the first valve core, as shown in fig. 7, when the air in the air inlet 18 passes through the valve body 16 and is limited by the first sealing ring 17-1, and cannot enter the air bag to complete inflation, and when the air in the air bag passes through the first valve core 13 and is limited by the second sealing ring 17-2, and cannot enter the air outlet 19 to complete air exhaustion;

specifically, fig. 8 shows a cross-sectional view C-C of the cab air spring balance valve along the second spool, as shown in fig. 8 and 9, when the air in the air inlet 18 passes through the connecting channel 20 and is limited by the third seal ring 17-3, and cannot enter the outer port 21 to complete the inflation of the control unit 2-1.

It can be seen that when the cab air spring is in a balanced state, the cab air spring is neither inflated nor deflated, floating around a preset height.

In some embodiments of the present utility model, fig. 10 shows a perspective view of a valve body in a state of inflation of a cab air spring, fig. 13 shows a side-by-side cross-sectional view of the valve body in the state of inflation of the cab air spring along a first valve core and a second valve core, and as shown in fig. 10 and 13, when one end of the pressure plate 9 is lifted by the first valve core 13 to be higher than a horizontal position, the cab air spring 1 is put into an inflated state, and at this time, the first valve core 13 and the second valve core 15 are in a lifted state;

specifically, fig. 11 shows a cross-sectional view D-D of the valve body of the air spring in the cab along the first valve core, as shown in fig. 11, when the air in the air inlet 18 passes through the valve body 16 to enter the air bag to complete inflation, and when the air in the air bag passes through the first valve core 13 and is limited by the second sealing ring 17-2, the air cannot enter the air outlet 19 to complete air exhaustion;

specifically, fig. 12 shows a cross-sectional view F-F of the valve body of the air spring in the cab along the second valve core, as shown in fig. 12 and 13, when the third sealing ring 17-3 does not pass through the connecting channel 20, the air in the air inlet 18 passes through the connecting channel 20 and is limited by the third sealing ring 17-3, and thus the air cannot be completely inflated; if the third sealing ring 17-3 passes over the connecting channel 20, the gas in the gas inlet 18 passes through the connecting channel 20 and enters the outer port 21 to complete the inflation.

Therefore, when the air spring has low air content and the stay wire cannot keep the pressure plate to maintain the balance position, the two valve cores move upwards under the action of the spring, and the two valve cores are unlocked and inflated to enter inflation.

In some embodiments of the present utility model, fig. 14 shows a perspective view of the cab air spring exhaust state valve body, fig. 17 shows a side-by-side cross-sectional view of the cab air spring exhaust state valve body along the first and second spools, as shown in fig. 14 and 17, when one end of the pressure plate 9 is pulled up above the horizontal position by the wire 8, the cab air spring 1 enters an exhaust state, when the first and second spools 13 and 15 are in a lowered state;

specifically, fig. 15 shows a cross-sectional view G-G of the valve body of the cab air spring in the exhaust state, as shown in fig. 15, when the air in the air inlet 18 passes through the valve body 16 and is limited by the first sealing ring 17-1, and cannot enter the air bag to complete inflation, and when the air in the air bag passes through the inside of the first valve core 13 and enters the air outlet 19 to complete exhaust;

specifically, fig. 16 shows a cross-sectional view I-I of the valve body of the air spring of the cab along the second valve core, as shown in fig. 16 and 17, when the third sealing ring 17-3 does not pass through the outer port 21, the air in the air inlet 18 is limited by the third sealing ring 17-3 through the connecting channel 20, and the air cannot be completely inflated; if the third sealing ring 17-3 passes over the outer port 21, the gas in the gas inlet 18 passes through the connecting channel 20 and enters the outer port 21 to complete the inflation.

Therefore, when the air content of the air spring is higher, one end of the stay wire connected with the pressing plate moves upwards, the two valve cores are stressed to move downwards to unlock the exhaust state, and the air spring of the cab enters the exhaust state to exhaust.

In summary, compared with the existing air spring, the air spring has self-adaptive adjusting capability, can automatically adjust the content of the internal air along with the height of the air spring, and has a special sensing mode, so that the reaction time can be greatly reduced, and the adjustment can be more quickly performed; meanwhile, the self-adaptive adjusting device is built in, so that the interference of the external environment to the self-adaptive adjusting device can be prevented, the precision is improved, the damage of elements caused by the external environment can be prevented, the service life is prolonged, a large amount of space can be saved in the aspect of space utilization, other elements can be deployed, and the self-adaptive adjusting device is higher in adaptability.

The foregoing is merely illustrative of the preferred embodiments of the present utility model, and is not intended to limit the scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model are included in the protection scope of the present utility model.

Claims (9)

1. The cab air spring comprises a damping adjustable damper, and is characterized by comprising a damping adjustable damper, an air spring upper seat, a dust cover, a bag cover, an air spring lower cover, a buckling ring, a stay wire, a pressing plate, a stand column, a connecting shaft, an adjusting nut, a first valve core, a spring, a second valve core, a valve body, a sealing ring, an air inlet, an air outlet, a connecting channel, an outer interface and an air storage tank;

the right end part of the damping adjustable damper is a control unit, the upper seat of the air spring of the cab is fixedly connected with the piston rod of the damping adjustable damper, and the lower cover of the air spring is fixedly connected with the outer cylinder of the damping adjustable damper;

the first valve core and the second valve core are of special hollow structures;

the sealing rings are divided into a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring;

the small holes are formed in the bottom of the air storage tank, so that air in the air storage tank can be slowly discharged.

2. A cab air spring according to claim 1, wherein the control unit of the damping adjustable damper is connected to the external interface via the air tank, and wherein the damping force variation of the damping adjustable damper is related not only to the relative displacement between the cab air spring upper seat and the cab air spring lower cover, but also to the rate of damping force variation of the damping adjustable damper.

3. A cab air spring according to claim 1, wherein one end of said wire is fixedly connected to said cab air spring upper seat and the other end of said wire is fixedly connected to one end of said pressure plate.

4. A cab air spring according to claim 1, wherein said pressure plate is adapted to be connected to said upright by said connecting shaft, said pressure plate being rotatable about said connecting shaft under the influence of said pull wire;

when the piston rod of the damping adjustable damper extends upwards, the upper seat of the air spring of the cab is driven to move upwards, one end of the pressing plate is pulled to move upwards through the stay wire, the other end of the pressing plate moves downwards under the action of the connecting shaft, the first valve core and the second valve core are pressed to move downwards, and gas in the air spring of the cab is discharged through the exhaust port;

when the damping adjustable damper piston rod is compressed downwards, the cab air spring upper seat is driven to move downwards, the stay wire between the cab air spring upper seat and the pressing plate is relaxed, and the first valve core and the second valve core move upwards under the action of spring force.

5. The cab air spring according to claim 1, wherein the upright post is adaptively connected with the adjusting nut through a preset hole position at the bottom of the cab air spring, and the position of the upright post in the lower cover of the cab air spring can be adjusted by rotating the adjusting nut, so that the position of the pressing plate in the cab air spring is adjusted, and the height of the cab air spring is adjusted.

6. A cab air spring according to claim 1, wherein said cab air spring has three states, namely a balanced state, an inflated state, and an exhausted state.

7. The cab air spring of claim 1, wherein when said pressure plate is maintained in a horizontal position by said pull wire, said cab air spring is brought into a balanced state with said first valve element and said second valve element in a balanced position;

at the moment, the gas in the gas inlet is limited by the first sealing ring through the valve body and cannot enter the air bag to complete inflation, and the gas in the air bag is limited by the second sealing ring through the inside of the first valve core and cannot enter the gas outlet to complete gas discharge;

at this time, the gas in the gas inlet passes through the connecting channel and is limited by the third sealing ring, and cannot enter the outer interface to complete the inflation of the control unit.

8. The cab air spring of claim 1, wherein when one end of the pressure plate is lifted by the first valve element to be higher than the horizontal position, the cab air spring enters an inflated state, and the first valve element and the second valve element are in a lifted state;

at the moment, the gas in the gas inlet passes through the valve body and enters the air bag to complete inflation, and at the moment, the gas in the air bag passes through the inside of the first valve core and is limited by the second sealing ring and cannot enter the gas outlet to complete gas discharge;

if the third sealing ring does not cross the connecting channel, the gas in the gas inlet passes through the connecting channel and is limited by the third sealing ring, so that the gas cannot be inflated; if the third sealing ring passes through the connecting channel, the gas in the gas inlet passes through the connecting channel and enters the outer interface to complete the inflation.

9. The cab air spring of claim 1, wherein when one end of said pressure plate is pulled up by said wire to be higher than the horizontal position, said cab air spring enters an exhaust state in which said first valve element and said second valve element are in a lowered state;

at the moment, the gas in the gas inlet passes through the valve body and is limited by the first sealing ring, and can not enter the air bag to complete inflation, and at the moment, the gas in the air bag passes through the first valve core and enters the gas outlet to complete gas discharge;

at this time, if the third sealing ring does not pass through the external interface, the gas in the gas inlet passes through the connecting channel and is limited by the third sealing ring, so that the gas cannot be inflated; if the third sealing ring passes over the outer interface, the gas in the gas inlet passes through the connecting channel and enters the outer interface to complete the inflation.