Air spring for improving the smoothness of a truck in empty and loaded conditions

Abstract

The application discloses an air spring for improving the smoothness of a truck in a full load state or an empty load state, which comprises an air bag, an auxiliary air chamber arranged at the bottom of the air bag, and an adjusting valve comprising a valve shell and a valve body movably arranged in the valve shell. The valve shell penetrates the auxiliary air chamber and the air bag. The bottom of the valve body is elastically supported by a spring. The side of the valve shell is provided with a first air passage communicating with the air bag and a second air passage communicating with the auxiliary air chamber. The top of the valve shell is provided with a third air passage. The internal air pressure of the air bag acts on the top of the valve body through the third air passage, so that the valve body has a first position and a second position with the change of the internal air pressure of the air bag. In the first position, the air bag is communicated through the first air passage, the second air passage and the auxiliary air chamber. In the second position, the valve body cuts off the communication between the air bag and the auxiliary air chamber. The air spring improves the smoothness of the vehicle in the full load state or the empty load state, the comfort of the driver and the passenger, and the controllability of the driver.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile suspension, in particular to an air spring for improving the smoothness of a loaded truck. BACKGROUND

[0002] With the development of society and the continuous improvement of people's living standards, the requirements for the comfort and stability of automobiles are getting higher and higher. As an important part of the automobile chassis, the suspension system has an important influence on the smoothness, operating stability and comfort of the automobile.

[0003] Taking a truck as an example, the steel plate spring is the most widely used elastic element in the truck suspension system, which is an approximately equal-strength elastic beam composed of a plurality of alloy spring plates of equal width but different lengths (the thickness can be equal or not equal). In terms of improving smoothness, the truck usually adopts two-stage stiffness steel plate springs because the rear axle load under the two states of empty load and full load of the truck is quite different. Such two-stage stiffness steel plate springs include independent main springs and auxiliary springs, which have different stiffness. When the rear axle load is small, only the main spring works, and the main spring stiffness is the first stage stiffness; when the rear axle load is large, the main spring and the auxiliary spring work together, and the stiffness of the main spring stiffness and the auxiliary spring stiffness is the second stage stiffness.

[0004] However, the position of the auxiliary spring support of the two-stage stiffness steel plate spring is usually fixed, so the contact load of the auxiliary spring is constant, which leads to poor universality of the steel plate spring assembly. When the steel plate spring assembly with the same contact load is applied to trucks with different load capacities, problems such as high partial frequency, insufficient smoothness, poor ride comfort, etc. of some trucks may occur. Moreover, under the load of the vehicle body and goods, especially under the full load state of the truck, the overall height of the steel plate spring suspension is reduced, which leads to the reduction of the vehicle body height, thereby increasing the pressure of the wheels on the ground. When the wheels encounter protrusions or depressions from the road surface, they will have greater movement inertia, and the amplitude of the fluctuations will be greater, the faster the vehicle speed, the more obvious the impact on the vehicle body, and the poorer the smoothness, which is also uncomfortable for the occupants.

[0005] Therefore, to improve truck ride comfort, more and more trucks are prioritizing air spring suspensions. However, the quality of the air spring design still directly impacts suspension performance, vehicle ride comfort, and overall ride quality. Furthermore, the air suspension's frequency deviation is determined by the sprung mass and air spring stiffness. A proper ratio of these two factors ensures optimal ride comfort. The rear axle load on an unladen truck is very small, while the axle load is very large when fully loaded. This results in significant variations in sprung mass between unladen and fully loaded. While the stiffness of the air spring also increases and decreases with load, the variation is much smaller than that of the sprung mass. While ensuring optimal ride comfort for a fully loaded truck rear air suspension, the unladen frequency deviation is typically high, resulting in poor ride comfort. Summary of the Invention

[0006] The present application provides an air spring for improving the smoothness of a truck when empty or fully loaded, so as to solve at least one of the above-mentioned technical problems.

[0007] The technical solutions adopted in this application are:

[0008] The cam is secured to the bottom of the airbag and is adapted to engage the cam during throttling to allow the vent to vent and to engage the vent valve, and the cam is secured to the bottom of the airbag and is adapted to engage the vent valve during throttling to engage the vent valve.

[0009] The air spring in this application for improving the smoothness of empty and full-load truck operation also has the following additional technical features:

[0010] The top of the auxiliary air chamber is recessed downward to form a groove connected to the air bag. The valve housing includes a valve cylinder and a valve seat installed at the bottom of the valve cylinder. The lower area of ​​the valve cylinder is passed through the auxiliary air chamber, and the upper area of ​​the valve cylinder passes upward from the bottom wall of the groove into the air bag. The first air vent is located inside the groove and extends circumferentially along the upper area of ​​the valve cylinder. The side wall of the groove is provided with a spiral air groove extending from top to bottom and arranged spirally.

[0011] The adjusting valve further comprises an adjusting bolt in threaded connection with the valve seat and used for adjusting the compression amount of the spring, a screw head of the adjusting bolt being located in the valve cylinder to support the spring, and the adjusting bolt being locked to the valve seat by a locking nut.

[0012] The bottom of the valve cylinder is out of the auxiliary air chamber, and the valve seat is in threaded connection with the valve cylinder outside the auxiliary air chamber.

[0013] The valve body comprises a body part and a sealing ring arranged around the body part, and the body part has an air flow channel with the valve cylinder; in the first position, the first air vent and the second air vent are in communication with the air flow channel respectively; in the second position, the valve body closes the first air vent by the sealing ring to cut off the communication between the first air vent and the air flow channel.

[0014] The top of the body part is provided with an upper air cavity with an opening arranged upward and in communication with the third air vent; and the bottom of the body part is provided with a lower limiting groove with an opening arranged downward and in limiting cooperation with the spring.

[0015] The valve cylinder is welded with the auxiliary air chamber.

[0016] The air bag comprises an air bag body and an air bag upper cover arranged at the top of the air bag body, the air bag upper cover is provided with an elastic buffer block extending into the air bag, the elastic buffer block is provided with a collapse hole at the middle part, and the top of the valve cylinder is provided with a collision baffle located directly below the elastic buffer block.

[0017] Thanks to the above technical solutions, the application has the following technical effects:

[0018] 1. In the air spring provided by the application, in the first position of the valve body, the valve body opens the first air vent to make the air bag and the auxiliary air chamber communicate, increase the effective volume of the air spring, and reduce the stiffness; in the second position of the valve body, the valve body closes the first air vent to cut off the communication between the air bag and the auxiliary air chamber, reduce the effective volume of the air spring, and increase the stiffness. Therefore, for a truck, when the truck is empty, the auxiliary air chamber communicates with the air bag, the effective volume of the air spring is increased, the stiffness is reduced, and the empty smoothness is improved. When the truck is fully loaded, the spring load is increased, the auxiliary air chamber is isolated from the air bag, the effective volume of the air spring is reduced, and the stiffness is increased, so that the fully loaded smoothness meets the use requirements. The communication and isolation of the air bag and the auxiliary air chamber are controlled by the pressure in the air spring, the effective volume of the air spring is automatically changed, the suspension stiffness of the truck in the empty and fully loaded states is adjusted, the empty and fully loaded frequency is equalized, and the smoothness of the vehicle running, the comfort of the driver and passengers, the controllability and operation stability of the driver are greatly improved.

[0019] 2. The switching of the valve body between the first position and the second position is achieved by the change of the internal air pressure of the air bag, the internal air pressure of the air bag is closely related to the sprung mass, for the truck, when empty, the auxiliary air chamber is automatically communicated with the air bag, when full, the auxiliary air chamber is automatically isolated from the air bag, the control mode is more flexible, without manual operation, which can reduce the driving burden of the driver, and the air spring provided by the application is a pure mechanical structure, low cost and high reliability.

[0020] 3. Compared with the steel plate spring, the overall height of the air suspension of the truck does not change whether the truck is empty or full, the height of the vehicle body only changes with the inflation and deflation of the air bag, and the height of the vehicle body always remains within a reasonable height range, and the phenomenon of too low vehicle body does not occur.

[0021] 4. The top of the auxiliary air chamber is recessed downward to form a recess communicating with the air bag, the first air port is located in the recess and extends along the circumferential direction of the upper region of the valve cylinder, the side wall of the recess is provided with a spiral air groove extending from top to bottom and arranged in a spiral manner, the spiral air groove plays a guiding role on the airflow between the air bag and the auxiliary air chamber, avoiding the airflow in the air bag from colliding with each other in the recess to generate turbulence, promoting the airflow in the air bag to flow to the first air port in a spiral flow mode stably and quickly, thereby helping to improve the rapidness and sensitivity of the air spring stiffness change of the vehicle when responding to different working conditions, and further improving the smoothness of vehicle driving, the comfort of the driver and the passenger, and the control and operation stability of the driver.

[0022] 5. The adjusting valve further comprises an adjusting bolt in threaded connection with the valve seat and used for adjusting the compression amount of the spring, the pre-compression length of the spring can be adjusted through the adjusting bolt, thereby changing the internal air pressure of the air bag for closing the first air port by the valve body, so that the air spring can adapt to different vehicle models. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 Structure diagram of the air spring for improving the smoothness of the truck in empty and full load conditions Figure 1 , which shows the state when the valve body is in the first position;

[0025] Figure 2 Structure diagram of the air spring for improving the smoothness of the truck in empty and full load conditions Figure 2 , which shows the state when the valve body is in the second position.

[0026] Reference signs:

[0027] 1 airbag, 11 airbag body, 12 airbag upper cover, 121 elastic buffer block, 122 collapse hole, 2 auxiliary air chamber, 21 groove, 22 spiral air groove, 3 valve body, 31 main body, 311 upper air cavity, 312 lower limit groove, 32 sealing ring, 4 spring, 5 valve cylinder, 51 first air vent, 52 second air vent, 53 third air vent, 6 valve seat, 7 adjusting bolt, 8 locking nut, 9 air flow channel. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0030] In this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0032] It should be noted that the expressions "first" and "second" used in the embodiments of the present invention are intended to distinguish two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the invention. Subsequent embodiments will not explain this one by one.

[0033] like Figure 1 andFigure 2 As shown in the figure, an air spring for improving the smoothness of a truck in empty and full load state, comprising an air bag 1, an auxiliary air chamber 2 and a regulating valve, wherein: the auxiliary air chamber 2 is arranged at the bottom of the air bag 1; the regulating valve comprises a valve shell and a valve body 3 movably arranged in the valve shell, the valve shell is arranged through the auxiliary air chamber 2 and the air bag 1, the bottom of the valve body 3 is elastically supported by a spring 4, the side of the valve shell is provided with a first air port 51 communicating with the air bag 1 and a second air port 52 communicating with the auxiliary air chamber 2, the top of the valve shell is provided with a third air port 53, and the internal air pressure of the air bag 1 acts on the top of the valve body 3 through the third air port 53 to make the valve body 3 have a first position and a second position with the change of the internal air pressure of the air bag 1; as Figure 1 shown in the figure, in the first position, the valve body 3 opens the first air port 51 to make the air bag 1 communicate through the first air port 51, the second air port 52 and the auxiliary air chamber 2; as Figure 2 shown in the figure, in the second position, the valve body 3 closes the first air port 51 to cut off the communication between the air bag 1 and the auxiliary air chamber 2.

[0034] In the air spring provided by the present application, in the first position of the valve body 3, the valve body 3 opens the first air port 51 to make the air bag 1 and the auxiliary air chamber 2 communicate, increase the effective volume of the air spring and reduce the stiffness; in the second position of the valve body 3, the valve body 3 closes the first air port 51 to cut off the communication between the air bag 1 and the auxiliary air chamber 2, reduce the effective volume of the air spring and increase the stiffness. Therefore, for the truck, when the truck is empty, the auxiliary air chamber 2 communicates with the air bag 1, the effective volume of the air spring is increased, the stiffness is reduced, and the empty load smoothness is improved. When the truck is full, the spring mass is increased, the auxiliary air chamber 2 is isolated from the air bag 1, the effective volume of the air spring is reduced, and the stiffness is increased, so that the full load smoothness meets the use requirements. The communication and isolation between the air bag 1 and the auxiliary air chamber 2 are controlled by the internal pressure of the air spring in the full and empty load states, the effective volume of the air spring is automatically changed, the suspension stiffness of the truck in the empty and full load states is adjusted, the equal frequency of the empty and full load states is achieved, and the smoothness of the vehicle driving, the comfort of the driver and the passenger, the controllability and the operation stability of the driver are greatly improved.

[0035] The switching of the valve body 3 between the first position and the second position is realized by the change of the internal air pressure of the air bag 1, the size of the internal air pressure of the air bag 1 is closely related to the spring mass, for the truck, when the truck is empty, the auxiliary air chamber 2 automatically communicates with the air bag 1, when the truck is full, the auxiliary air chamber 2 is automatically isolated from the air bag 1, the control mode is more flexible, no manual operation is needed, the driving burden of the driver can be reduced, and the air spring provided by the present application is a pure mechanical structure, has low cost and high reliability.

[0036] Compared with the steel plate spring, the overall height of the air suspension of the truck using the air spring provided by the application does not change whether the truck is in an empty state or a full load state, and the height of the vehicle body only changes with the inflation and deflation of the air bag, so the height of the vehicle body is always maintained within a reasonable height range and the phenomenon of excessively low vehicle body does not occur.

[0037] Preferably, the air spring provided by the application can be applied to the rear air suspension of the truck, when the truck is empty, the rear axle load is low, the air pressure in the air spring is also low, the pressure of the air bag 1 acting on the upper end of the valve body 3 through the third air port 53 is small, and the pressure cannot overcome the pre-pressure of the spring 4 applied to the valve body 3, so the valve body 3 is in the first position, the air bag 1 is in communication with the auxiliary air chamber 2 through the first air port 51 and the second air port 52, and thus the effective volume of the air spring is the volume of the air bag 1 plus the volume of the auxiliary air chamber 2, the effective volume of the air spring is increased, and the stiffness of the air spring is reduced, so that the truck is in a low frequency state when empty and has good smoothness. As the rear axle load of the truck increases, the pressure in the air spring increases, and the pressure of the air bag 1 acting on the upper end of the valve body 3 also increases, when the pressure on the upper end of the valve body 3 exceeds the pre-pressure of the spring 4, the valve body 3 starts to move downward, and after moving downward to a certain distance, the valve body 3 closes the first air port 51, so that the gas in the air bag 1 cannot enter the auxiliary air chamber 2, and the effective volume of the air spring is only the volume of the air bag 1, and because the effective volume is reduced, the stiffness of the air spring is increased, when the rear axle is fully loaded, the load increases more, the stiffness of the air spring is increased more by changing the effective volume, so that the frequency of the rear suspension when fully loaded is similar to that when empty, and the equal frequency of empty and full load is ensured. Moreover, the air spring of the application can also improve the roll problem of the truck and improve the roll resistance of the truck, when turning and changing lanes, the height of the vehicle body on the outer side of the turn is reduced, and the pressure in the air bag at the wheel on the outer side of the turn is increased, so that the valve body cuts off the air bag and the auxiliary air chamber, the effective volume of the air spring is reduced, and the stiffness of the air spring is increased, thereby helping to increase the height of the vehicle body on the outer side of the turn, maintaining the height difference between the inner side of the turn and the outer side of the turn within a reasonable range, improving the side swing phenomenon of the truck when changing lanes, and improving the driving safety.

[0038] As a preferred embodiment of the application, as shown in Figure 1 the top of the auxiliary air chamber 2 can be recessed downward to form a recess 21 in communication with the air bag 1, the valve housing includes a valve cylinder 5 and a valve seat 6 mounted at the bottom of the valve cylinder 5, the lower region of the valve cylinder 5 penetrates into the auxiliary air chamber 2, the upper region of the valve cylinder 5 penetrates into the air bag 1 from the bottom wall of the recess 21, the first air port 51 is located inside the recess 21 and extends along the circumference of the upper region of the valve cylinder 5, and the side wall of the recess 21 is provided with helical grooves 22 extending from top to bottom and arranged in a spiral.

[0039] The skilled in the art can understand that firstly, the setting of the groove 21 and the structure of the upper region of the valve cylinder 5 penetrating into the groove 21 reduce the internal space of the air bag 1 occupied by the adjusting valve, make the overall structure of the air spring more compact, improve the space utilization, solve the problem of occupying other space of the truck, and further, the setting of the groove 21 makes the internal pressure of the air bag 1 generate a step at the entrance of the groove 21, so as to facilitate the guiding of the air flow in the air bag 1 to the first air port 51 and promote the air flow in the air bag 1 to enter the auxiliary air chamber 2 quickly. The first air port 51 is located in the groove 21 and extends along the circumference of the upper region of the valve cylinder 5, the side wall of the groove 21 is provided with a spiral air groove 22 extending from top to bottom and arranged spirally, the spiral air groove 22 plays a guiding role for the air flow between the air bag 1 and the auxiliary air chamber 2, avoids the air flow in the air bag 1 from colliding with each other in the groove 21 to generate turbulence, promotes the air flow in the air bag 1 to flow to the first air port 51 stably and quickly in the form of spiral flow, and accelerates the change speed of the effective volume of the air spring, so as to help to improve the rapidness and sensitivity of the air spring stiffness change of the vehicle when coping with different working conditions, and further improve the smoothness of the vehicle driving, the comfort of the driver and passenger, and the control and operation stability of the driver.

[0040] As a preferred embodiment of the present embodiment, as shown in Figure 1 The adjusting valve further comprises an adjusting bolt 7 threadedly connected with the valve seat 6 and used for adjusting the compression amount of the spring 4, the screw head of the adjusting bolt 7 is located in the valve cylinder 5 to support the spring 4, and the adjusting bolt 7 is locked to the valve seat 6 through a locking nut 8.

[0041] The skilled in the art can understand that the pre-compression length of the spring 4 can be adjusted through the adjusting bolt 7, and then the internal pressure of the air bag 1 when the valve body 3 closes the first air port 51 is changed, so that the air spring can be adapted to different vehicle models. In specific implementation, when the locking nut 8 is loosened and the adjusting bolt 7 is screwed into the valve cylinder 5, the spring 4 is compressed, and the pre-compression force of the spring 4 is increased, so that the internal pressure of the air bag 1 required for the valve body 3 to cut off the air bag 1 and the auxiliary air chamber 2 is increased, and vice versa, the adjusting bolt 7 is screwed out of the valve cylinder 5, so that the internal pressure of the air bag 1 required for the valve body 3 to cut off the air bag 1 and the auxiliary air chamber 2 is reduced. When the air spring is applied to the truck with different empty rear axle loads, the pressure when the air spring air bag 1 and the auxiliary air chamber 2 are cut off can be adjusted by adjusting the screwing length of the adjusting bolt 7 in the valve cylinder 5, so as to ensure the smoothness of the rear suspension when it is empty.

[0042] Further, as shown in Figure 1 The bottom of the valve cylinder 5 penetrates out of the auxiliary air chamber 2, and the valve seat 6 is threadedly connected with the valve cylinder 5 outside the auxiliary air chamber 2.

[0043] It will be understood by those skilled in the art that by threading the valve seat 6 to the valve cylinder 5 on the outside of the auxiliary air chamber 2, a detachable connection between the valve seat 6 and the valve cylinder 5 is achieved. When the spring 4 in the valve cylinder 5 rusts, the valve seat 6 can be removed from the valve cylinder 5 to replace the rusted spring 4.

[0044] As a preferred embodiment of this embodiment, Figure 1 and Figure 2 As shown, the valve body 3 includes a main body portion 31 and a sealing ring 32 arranged around the main body portion 31, and an air flow channel 9 is provided between the main body portion 31 and the valve cylinder 5; Figure 1 As shown, in the first position, the first vent 51 and the second vent 52 are respectively connected to the air flow channel 9; Figure 2 As shown, in the second position, the valve body 3 closes the first vent 51 through the sealing ring 32 to cut off the communication between the first vent 51 and the air flow channel 9 .

[0045] Furthermore, if Figure 1 As shown, the top of the main body 31 is provided with an upper air cavity 311 with an opening facing upward and communicating with the third vent 53; the bottom of the main body 31 is provided with a lower limiting groove 312 with an opening facing downward and cooperating with the spring 4.

[0046] Those skilled in the art will appreciate that the setting of the upper air cavity 311 enables the airbag 1 to squeeze more air into the upper part of the valve body 3 through the third air vent 53, thereby avoiding as much as possible the airflows flowing along the third air vent 53 from canceling each other out in the horizontal direction, thereby ensuring the vertical pushing force of the airflow on the valve body 3, and helping to improve the sensitivity of the internal air pressure of the airbag 1 to the pushing effect on the valve body 3; the setting of the lower limit groove 312 can limit the spring 4 in the radial direction, thereby preventing the spring 4 from running off and failing to provide sufficient pre-pressure for the spring 4.

[0047] As a preferred embodiment of this embodiment, the valve cylinder 5 can be welded to the auxiliary air chamber 2. Welding the auxiliary air chamber 2 and the valve cylinder 5 into one can improve the overall structural strength and service life of the air spring, and also ensure the sealing. There is no need to set a sealing structure between the auxiliary air chamber 2 and the valve cylinder 5, saving sealing costs.

[0048] As a preferred embodiment of this embodiment, Figure 1 As shown, the airbag 1 can include an airbag body 11 and an airbag cover 12 arranged on the top of the airbag body 11, the airbag cover 12 is provided with an elastic buffer block 121 extending into the airbag 1, and a collapse hole 122 is provided in the middle of the elastic buffer block 121, and the top of the valve cylinder 5 is provided with an anti-collision baffle located directly below the elastic buffer block 121.

[0049] Those skilled in the art can understand that the elastic buffer block 121 can abut against the anti-collision baffle when the air spring is compressed, so as to limit the air spring in the height direction, and the collapse hole 122 in the middle of the elastic buffer block 121 has the effect of collapsing the elastic buffer block 121 itself when impacted, so as to avoid damaging other components while achieving the limiting effect.

[0050] The places not described in the application can be implemented by using or referring to the existing technology.

[0051] Each of the embodiments in the specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment mainly describes the difference from other embodiments.

[0052] The above only describes the embodiments of the application and is not intended to limit the application. Those skilled in the art can make various changes and modifications to the application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application shall be included in the scope of the claims of the application.

Claims

1. An air spring that improves the ride comfort of a truck when empty or fully loaded, characterized in that: include: airbags; an auxiliary air chamber, which is provided at the bottom of the airbag; A regulating valve comprising a valve housing and a valve body movably disposed within the valve housing, the valve housing being inserted through the auxiliary air chamber and the air bag, the bottom of the valve body being elastically supported by a spring, a first vent communicating with the air bag and a second vent communicating with the auxiliary air chamber being formed on a side of the valve housing, and a third vent being formed on a top of the valve housing, wherein the internal air pressure of the air bag acts on the top of the valve body through the third vent so that the valve body has a first position and a second position as the internal air pressure of the air bag changes; In the first position, the valve body opens the first vent to allow the airbag to communicate with the auxiliary air chamber through the first vent, the second vent, and the auxiliary air chamber; in the second position, the valve body closes the first vent to cut off the communication between the airbag and the auxiliary air chamber; The top of the auxiliary air chamber is recessed downward to form a groove communicating with the air bag. The valve housing includes a valve cylinder and a valve seat mounted on the bottom of the valve cylinder. The lower region of the valve cylinder is inserted into the auxiliary air chamber. The upper region of the valve cylinder extends upward from the bottom wall of the groove into the air bag. The first vent is located inside the groove and extends along the circumference of the upper region of the valve cylinder. The sidewall of the groove is provided with a spiral air groove extending from top to bottom and arranged in a spiral manner. The airbag includes an airbag body and an airbag cover arranged on the top of the airbag body. The airbag cover is provided with an elastic buffer block extending into the airbag. A collapse hole is provided in the middle of the elastic buffer block. The top of the valve cylinder is provided with an anti-collision baffle located directly below the elastic buffer block.

2. The air spring for improving the smoothness of empty and full-loaded trucks according to claim 1, characterized in that: The regulating valve further comprises an adjusting bolt threadedly connected to the valve seat and used for adjusting the compression amount of the spring. The screw head of the adjusting bolt is located in the valve cylinder to support the spring. The adjusting bolt is locked to the valve seat by a locking nut.

3. The air spring for improving the smoothness of empty and full-loaded trucks according to claim 2, characterized in that: The bottom of the valve cylinder passes through the auxiliary air chamber, and the valve seat is threadedly connected to the valve cylinder on the outside of the auxiliary air chamber.

4. The air spring for improving the smoothness of empty and full-loaded trucks according to claim 1, characterized in that: The valve body comprises a main body and a sealing ring arranged around the main body, and an air flow channel is provided between the main body and the valve cylinder; In the first position, the first vent and the second vent are respectively connected to the air flow channel; in the second position, the valve body seals the first vent through the sealing ring to cut off the connection between the first vent and the air flow channel.

5. The air spring for improving the smoothness of empty and full-loaded trucks according to claim 4, characterized in that: The top of the main body is provided with an upper air cavity with an opening facing upward and communicating with the third vent; The bottom of the main body is provided with a lower limiting groove with an opening facing downward and cooperating with the spring.

6. The air spring for improving the smoothness of empty and full-loaded trucks according to claim 1, characterized in that: The valve cylinder is welded to the auxiliary air chamber.

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