Bag type air spring assembly

Abstract

According to the bag type air spring assembly, the interior of an air bag is communicated with an additional air chamber through a pipeline structure, the air volume is increased, the rigidity is reduced, and the vibration reduction effect is improved. The pipeline structure comprises the pressure regulating straight pipe and the arc-shaped pressure regulating pipe, the gas flowing path is increased, the damping effect is generated, and impact and vibration are relieved. A limiting piece is arranged between the piston assembly and the air bag, and safety of the piston assembly and the air bag under extreme conditions is protected. The limiting piece comprises a connecting air nozzle and a stop sleeve, and the connecting air nozzle is provided with an air circulation hole so that air circulation can be facilitated. The shell is divided into the base and the cover plate and is convenient to machine and install. The rolling plate assembly comprises an end plate and an air pipe connector, the end plate is provided with a riveting edge and a steel wire ring, and the connection reliability between the air bag and the end plate is enhanced. The bag type air spring assembly has excellent vibration reduction performance and stability and is suitable for various vehicle suspension systems.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bag type air spring assembly. BACKGROUND

[0002] Air spring is the key component of the air suspension system of the automobile. Compared with the past ordinary suspension, air suspension can prolong the service life of the vehicle, improve the comfort of the whole vehicle, reduce the dynamic load of the wheel, greatly reduce the damage degree of the vehicle to the road surface, thereby reduce the maintenance cost of the highway road surface, and can also adjust the body height of the special and special vehicles such as airport shuttle bus and city bus according to the requirement.

[0003] The utility model discloses a novel bag type air spring, which mainly comprises a gas bag and an iron piston, the upper end of the gas bag is connected with an iron upper cover plate for connecting with a vehicle body, the outer periphery of the gas bag is provided with two groups of waist ring steel rings,

[0004] Firstly, combined with the attached Figure 1 It can be clearly seen that the upper part of the iron piston assembly is an opening with a large diameter, so that the inside of the iron piston is only an additional air chamber, but there is no special structure for the gas in the gas bag to enter the additional air chamber, so there is no damping effect, and the air spring only has the function of increasing the air chamber. The damping effect of the air spring is poor.

[0005] Secondly, combined with the attached Figure 1 It can be clearly seen that no emergency stop structure is arranged between the iron piston and the gas bag, and the iron piston is easy to collide with the iron upper cover plate in the extreme case of the air spring, thereby damaging the iron piston, the iron upper cover plate and other structures. UTILITY MODEL CONTENTS

[0006] The utility model provides a bag type air spring assembly, which solves the technical problems of the prior art. The inside of the gas bag and the additional air chamber are connected through the pipeline structure and the damping hole, the air volume is increased, the stiffness is reduced, the damping effect is improved, and the damping characteristics are generated in the gas flow process, thereby reducing the impact and vibration.

[0007] To achieve the above object, the utility model provides the following technical scheme: a bag type air spring assembly, which comprises a gas bag and a piston assembly, the upper part of the gas bag is connected with a coiled plate assembly, the lower part is connected with the piston assembly, the middle part of the gas bag is connected with a waist ring, the coiled plate assembly is connected with a gas pipe joint, the gas pipe joint is hollow and communicates with the inside of the gas bag, the piston assembly comprises an outer shell, the inside of the outer shell is provided with an additional air chamber, characterized in that: the end of the outer shell away from the gas bag is provided with a damping hole, the damping hole is connected with a pipeline structure, and the pipeline structure connects the inside of the gas bag and the additional air chamber.

[0008] The interior of the air bag is communicated with the additional air chamber through the pipeline structure and the damping hole, so as to communicate the two cavities, increase the air volume of the air spring, effectively reduce the stiffness of the air spring, and improve the damping effect (the lower the stiffness, the better the comfort, and the better the vibration filtering effect, which can reduce the failure rate of the vehicle body parts and effectively prolong the service life). When the air spring is compressed or stretched during operation, due to the change of the internal gas pressure, the cavity with high internal gas pressure will flow to the cavity with low internal gas pressure, and the airflow flows through the connecting pipeline. Due to the small inner diameter of the opening at the bottom of the piston and the connecting pipeline, the damping characteristics are generated in the flow process, and the impact and vibration are slowed down. Further, the pipeline structure is used to communicate the air bag with the damping hole at the bottom of the shell, and the moving path of the gas is lengthened. When the gas passes through the pipeline structure and the damping hole, due to the change of the flow rate and the friction of the inner wall of the pipeline, the damping effect is generated. The damping helps to absorb and disperse the impact energy, reduce the vibration amplitude, and improve the stability and ride comfort of the system.

[0009] The above-mentioned bag type air spring assembly can be further provided as follows: the pipeline structure includes a pressure regulating straight pipe and an arc-shaped pressure regulating pipe, the pressure regulating straight pipe is distributed in the middle part of the shell, and the two ends of the pressure regulating straight pipe respectively penetrate the upper end and the lower end of the shell, the arc-shaped pressure regulating pipe is distributed outside the shell, one end of the arc-shaped pressure regulating pipe is communicated with the damping hole, and the other end is communicated with the pressure regulating straight pipe, and the pressure regulating straight pipe communicates the interior of the air bag with the arc-shaped pressure regulating pipe.

[0010] The pressure regulating straight pipe and the arc-shaped pressure regulating pipe cooperate to realize the communication of the air bag, the damping hole and the additional air chamber, and increase the path of gas flow. The gas will consume part of the damping in the process of flowing through the pressure regulating straight pipe, the arc-shaped pressure regulating pipe and the damping hole, which helps to slow down the impact and vibration when the air bag is stretched and contracted, thereby improving the ride comfort of the vehicle.

[0011] The above-mentioned bag type air spring assembly can be further provided as follows: a limiting piece is arranged between the piston assembly and the air bag, and the limiting piece is fixed to the end of the shell facing the air bag.

[0012] The limiting piece is arranged, when the air spring encounters an extreme situation, the limiting piece collides with the winding plate assembly instead of the piston assembly, which protects the piston assembly and the air bag, and has the effect of emergency stop.

[0013] The above-mentioned bladder air spring assembly can be further provided as follows: the limiting piece comprises a connecting air nozzle, a stop sleeve surrounding the outer periphery of the connecting air nozzle, the inner periphery of the stop sleeve is provided with a stop step, the upper portion of the connecting air nozzle is provided with a limiting ring in contact with the stop step, the inside of the stop sleeve is provided with a cavity, the stop sleeve is higher than the connecting air nozzle, the lower portion of the connecting air nozzle is sealingly connected with the shell, the lower end of the connecting air nozzle is provided with a plug-in hole, the upper end of the pressure regulating straight pipe is adapted to the plug-in hole, the connecting air nozzle is provided with a gas flow-through hole penetrating therethrough, and the gas flow-through hole communicates the air bag with the pressure regulating straight pipe.

[0014] The connecting air nozzle not only plays a role in fixing the stop sleeve, but also is provided with a gas flow-through hole inside, so as to facilitate the communication of the air bag with the pressure regulating straight pipe and realize the flow of gas between the air bag and the additional air chamber. Further, the cavity is arranged on the stop sleeve, which can reduce the weight of the limiting piece, that is, reduce the overall weight of the air spring. Further, the stop sleeve is higher than the connecting air nozzle, which aims to avoid the connecting air nozzle from protruding and affecting the role of the stop sleeve in "emergency stop".

[0015] The above-mentioned bladder air spring assembly can be further provided as follows: the lower end of the pressure regulating straight pipe is provided with a connecting ring groove recessed towards the inside of the pressure regulating straight pipe, and one end of the arc-shaped pressure regulating pipe is sleeved on the outer periphery of the pressure regulating straight pipe and is adapted to the connecting ring groove; the other end of the arc-shaped pressure regulating pipe is sealingly connected with a cylindrical connecting pipe, the inside of the cylindrical connecting pipe is hollow to form a damping hole, and the upper end of the cylindrical connecting pipe is sealingly connected with the shell.

[0016] The pressure regulating straight pipe and the arc-shaped pressure regulating pipe are sealingly connected through the connecting ring groove, which increases the contact area and can reduce the risk of leakage. The cylindrical connecting pipe is arranged, which facilitates the installation of the arc-shaped pressure regulating pipe and the machining of the damping hole.

[0017] The above-mentioned bladder air spring assembly can be further provided as follows: the shell comprises a hollow base and a cover plate distributed above the base, the upper end of the base is provided with a connecting flange, the lower end of the air bag is sleeved on the outer periphery of the connecting flange, the lower end of the air bag is provided with two groups of limiting ring strips arranged in an upper and lower opposite and spaced manner on the side away from the connecting flange, and a connecting piece sleeved on the outer periphery of the air bag is arranged between the two groups of limiting ring strips.

[0018] The shell is divided into the base and the cover plate, which facilitates the machining of the additional air chamber. The main role of the connecting flange is to provide a plane for sealingly connecting with the lower end of the air bag, so as to ensure that the gas between the air bag and the piston assembly does not leak. The connecting piece is additionally arranged, which further improves the connection tightness between the air bag and the piston assembly. The upper and lower two groups of limiting ring strips can guide the installation of the connecting piece and limit the connecting piece after installation, so as to avoid the up and down movement of the connecting piece.

[0019] The capsule air spring assembly can be further provided with the following arrangement: the coiled plate assembly comprises an end plate, the end plate is provided with at least one set of mounting holes, each set of mounting holes is welded with a set of air pipe joints, the outer ring of the end plate is provided with a riveting edge facing the coiled air bag, the upper end of the air bag is inserted into the riveting edge and the upper end of the air bag is also connected with a wire ring.

[0020] The riveting edge and the upper end of the air bag are matched to firmly fix the upper end of the air bag on the end plate.

[0021] The utility model will be described in further detail below in combination with the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a cross-sectional schematic view of the embodiment of the utility model;

[0023] Figure 2 It is Figure 1 It is a local enlarged schematic view of A in the middle;

[0024] Figure 3 It is Figure 1 It is a local enlarged schematic view of B in the middle;

[0025] Figure 4 It is Figure 1 It is a local enlarged schematic view of C in the middle;

[0026] Figure 5 It is Figure 1 It is a local enlarged schematic view of D in the middle.

[0027] Label annotation: air bag 1, air pipe joint 2, additional air chamber 3, damping hole 4, pressure regulating straight pipe 5, arc pressure regulating pipe 6, connecting air nozzle 7, stop sleeve 8, stop step 9, cavity 10, plug-in hole 11, gas flow-through hole 12, connecting ring groove 13, cylindrical connecting pipe 14, base 15, cover plate 16, connecting flange 17, limiting ring strip 18, connecting piece 19, end plate 20, riveting edge 21, wire ring 22, waist ring 23, limiting ring 24. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0029] As Figures 1 to 5The shown air bag spring assembly includes an air bag 1, a piston assembly, a roll plate assembly connected to the upper part of the air bag 1, and the piston assembly connected to the lower part of the air bag 1, a waist ring 23 connected to the middle part of the air bag 1, a gas pipe joint 2 connected to the roll plate assembly, the gas pipe joint 2 is hollow and communicates with the inside of the air bag 1, the piston assembly includes a shell, an additional air chamber 3 is arranged inside the shell, a damping hole 4 is arranged at the end of the shell away from the air bag 1, and a pipeline structure is communicated with the inside of the air bag 1 and the additional air chamber 3.

[0030] The pipeline structure includes a pressure regulating straight pipe 5 and an arc-shaped pressure regulating pipe 6, the pressure regulating straight pipe 5 is distributed in the middle part of the shell, and the two ends of the pressure regulating straight pipe 5 respectively penetrate the upper end and the lower end of the shell, the arc-shaped pressure regulating pipe 6 is distributed outside the shell, one end of the arc-shaped pressure regulating pipe 6 communicates with the damping hole 4, and the other end communicates with the pressure regulating straight pipe 5, and the pressure regulating straight pipe 5 communicates the inside of the air bag 1 with the arc-shaped pressure regulating pipe 6. The pressure regulating straight pipe 5 cooperates with the arc-shaped pressure regulating pipe 6 to realize the communication of the air bag 1, the damping hole 4 and the additional air chamber 3, increase the path of gas flow, and consume a part of the damping in the process of gas flowing through the pressure regulating straight pipe 5, the arc-shaped pressure regulating pipe 6 and the damping hole 4, which helps to reduce the impact and vibration when the air bag 1 is stretched and contracted, thereby improving the riding comfort of the vehicle.

[0031] A limiting piece is arranged between the piston assembly and the air bag 1, and the limiting piece is fixed to the end of the shell facing the air bag 1. When the air spring encounters an extreme situation, the limiting piece collides with the roll plate assembly instead of the piston assembly, thereby protecting the piston assembly and the air bag 1, and achieving the effect of emergency stop.

[0032] The limiting piece includes a connecting gas nozzle 7 and a stop sleeve 8 surrounding the outer periphery of the connecting gas nozzle 7, a stop step 9 is arranged on the inner periphery of the stop sleeve 8, a limiting ring 24 is arranged on the upper part of the connecting gas nozzle 7 and in contact with the stop step 9, a cavity 10 is arranged in the inside of the stop sleeve 8, the stop sleeve 8 is higher than the connecting gas nozzle 7, the lower part of the connecting gas nozzle 7 is sealingly connected with the shell, an insertion hole 11 is arranged in the inside of the lower end of the connecting gas nozzle 7, the upper end of the pressure regulating straight pipe 5 is adapted to the insertion hole 11, a gas flow hole 12 is arranged in the connecting gas nozzle 7 and communicates the air bag 1 with the pressure regulating straight pipe 5. The connecting gas nozzle 7 not only plays a role in fixing the stop sleeve 8, but also has the gas flow hole 12 in the inside, which facilitates the communication between the air bag 1 and the pressure regulating straight pipe 5 and realizes the flow of gas between the air bag 1 and the additional air chamber 3. Further, the cavity 10 is arranged on the stop sleeve 8, which can reduce the weight of the limiting piece, that is, reduce the overall weight of the air spring. Further, the stop sleeve 8 is higher than the connecting gas nozzle 7, which is to avoid the connecting gas nozzle 7 from protruding and affecting the function of the stop sleeve 8 in emergency stop.

[0033] The lower end of the pressure regulating straight pipe 5 is provided with a connecting ring groove 13 recessed towards the inside of the pressure regulating straight pipe 5, and one end of the arc-shaped pressure regulating pipe 6 is sleeved on the outer periphery of the pressure regulating straight pipe 5 and matched with the connecting ring groove 13; the other end of the arc-shaped pressure regulating pipe 6 is sealingly connected with a cylindrical connecting pipe 14, the inside of the cylindrical connecting pipe 14 is hollow to form the damping hole 4, and the upper end of the cylindrical connecting pipe 14 is sealingly connected with the shell. The pressure regulating straight pipe 5 and the arc-shaped pressure regulating pipe 6 are sealingly connected through the connecting ring groove 13, the contact area is increased, and the risk of leakage is reduced. The cylindrical connecting pipe 14 is arranged, which facilitates the installation of the arc-shaped pressure regulating pipe 6 and facilitates the processing of the damping hole 4.

[0034] The shell includes an internally hollow base 15 and a cover plate 16 distributed above the base 15, the upper end of the base 15 is provided with a connecting flange 17, the lower end of the air bag 1 is sleeved on the outer periphery of the connecting flange 17, and the lower end of the air bag 1 is provided with two groups of limiting rings 24 arranged in an upper-lower opposite and spaced manner on the side away from the connecting flange 17, and the two groups of limiting rings 24 are provided with a connecting piece 19 sleeved on the outer periphery of the air bag 1. The shell is divided into the base 15 and the cover plate 16, which facilitates the processing of the additional air chamber 3. The main function of the connecting flange 17 is to provide a plane for sealingly connecting with the lower end of the air bag 1, and to ensure that the gas between the air bag 1 and the piston assembly cannot leak. The connecting piece 19 is additionally arranged, which further improves the connection tightness between the air bag 1 and the piston assembly. The two groups of limiting rings 24 can guide the installation of the connecting piece 19, and limit the connecting piece 19 after installation, avoiding the up-and-down movement of the connecting piece 19.

[0035] The winding plate assembly includes an end plate 20, the end plate 20 is provided with at least one group of mounting holes, each group of mounting holes is welded with a group of gas pipe joints 2, the outer circle of the end plate 20 is provided with a riveting edge 21 facing the winding of the air bag 1, the upper end of the air bag 1 is inserted into the riveting edge 21, and the upper end of the air bag 1 is also connected with a wire ring 22. The cooperation between the riveting edge 21 and the upper end of the air bag 1 can firmly fix the upper end of the air bag 1 on the end plate 20. The wire ring 22 is arranged between the air bag 1 and the end plate 20, which enhances the connection reliability between the air bag 1 and the end plate 20.

[0036] When the air bag 1 expands, as the internal gas pressure of the air bag 1 rises, the air bag 1 begins to expand. At this time, the gas in the air bag 1 flows to the additional air chamber 3 through the connecting gas nozzle 7, the pipeline structure and the damping hole 4. When the air bag 1 contracts, as the internal gas pressure of the air bag 1 decreases, the air bag 1 begins to contract. At this time, the gas in the additional air chamber 3 flows back to the inside of the air bag 1 through the damping hole 4, the pipeline structure and the connecting gas nozzle 7.

[0037] The pipeline structure is used to connect the air bag 1 and the damping hole 4 at the bottom of the shell, lengthen the moving path of the gas, and generate a damping effect when the gas passes through the pipeline structure and the damping hole 4 due to the change of flow rate and the friction of the inner wall of the pipeline, which helps to absorb and disperse the impact energy, reduce the vibration amplitude, improve the stability of the system and the riding comfort. Whether the air bag 1 is contracted or expanded, the pipeline structure connects the air bag 1 and the damping hole 4 at the bottom of the shell, lengthens the moving path of the gas, and generates a damping effect when the gas passes through the pipeline structure and the damping hole 4 due to the change of flow rate and the friction of the inner wall of the pipeline, which helps to absorb and disperse the impact energy, reduce the vibration amplitude, improve the stability of the system and the riding comfort.

[0038] In summary, the pipeline structure and the damping hole 4 are used to connect the inside of the air bag 1 and the additional air chamber 3, thereby connecting the two cavities, increasing the air volume of the air spring, effectively reducing the stiffness of the air spring, improving the damping effect (the lower the stiffness, the better the comfort, and the better the vibration filtering effect, which can reduce the failure rate of the vehicle body parts and effectively prolong the service life), and when the air spring is working, the compression or stretching will cause the cavity with high internal gas pressure to flow to the cavity with low internal gas pressure, the airflow flows through the connecting pipeline, and due to the small opening at the bottom of the piston and the small inner diameter of the connecting pipeline, the flow process generates a damping characteristic, which slows down the impact and vibration.

Claims

1. A bladder-type air spring assembly, comprising an airbag and a piston assembly. The airbag is connected to a coil assembly at the top and to a piston assembly at the bottom. A waist ring is connected to the middle of the airbag. The coil assembly is connected to an air pipe joint, which is hollow and communicates with the interior of the airbag. The piston assembly includes a housing with an additional air chamber inside. The following features are present: The end of the shell away from the airbag is provided with a damping hole, and the damping hole is connected with a pipeline structure, and the pipeline structure connects the interior of the airbag with the additional air chamber.

2. The bag-type air spring assembly according to claim 1, characterized in that: The pipeline structure includes a straight pressure-regulating pipe and an arc-shaped pressure-regulating pipe. The straight pressure-regulating pipe is distributed in the middle of the shell, and the two ends of the straight pressure-regulating pipe respectively pass through the upper end and the lower end of the shell. The arc-shaped pressure-regulating pipe is distributed outside the shell, and one end of the arc-shaped pressure-regulating pipe is connected to the damping hole and the other end is connected to the straight pressure-regulating pipe. The straight pressure-regulating pipe connects the interior of the airbag with the arc-shaped pressure-regulating pipe.

3. The bag-type air spring assembly according to claim 2, characterized in that: A limiting component is provided between the piston assembly and the airbag, and the limiting component is fixed to the end of the shell facing the airbag.

4. The bag-type air spring assembly according to claim 3, characterized in that: The limiting component includes a connecting gas nozzle and a stop sleeve surrounding the outer circumference of the connecting gas nozzle, the inner circumference of the stop sleeve is provided with a stop step, and a limiting ring in contact with the stop step is provided above the connecting gas nozzle. A cavity is provided inside the stop sleeve, and the stop sleeve is higher than the connecting gas nozzle. The bottom of the connecting gas nozzle is sealed with the outer shell, and a plug hole is provided inside the lower end of the connecting gas nozzle. The upper end of the pressure-regulating straight pipe is adapted to the plug hole, and a gas flow hole runs through the connecting gas nozzle, and the gas flow hole connects the airbag with the pressure-regulating straight pipe.

5. The bag-type air spring assembly according to claim 2, characterized in that: The lower end of the pressure-regulating straight pipe is provided with a connecting ring groove which is recessed toward the inner side of the pressure-regulating straight pipe. One end of the arc-shaped pressure-regulating pipe is sleeved on the outer periphery of the pressure-regulating straight pipe and is adapted to the connecting ring groove. The other end of the arc-shaped pressure-regulating pipe is sealed and connected to a cylindrical connecting pipe. The interior of the cylindrical connecting pipe is hollow to form a damping hole. The upper end of the cylindrical connecting pipe is sealed and connected to the outer shell.

6. The bag-type air spring assembly according to any one of claims 1 to 5, characterized in that: The shell includes a base with a hollow interior and a cover plate distributed above the base. The upper end of the base is provided with a connecting flange, and the lower end of the airbag is sleeved on the outer periphery of the connecting flange. The lower end of the airbag is located on the side away from the connecting flange and is provided with two groups of limiting rings that are opposite to each other and arranged at intervals. A connecting piece sleeved on the outer periphery of the airbag is provided between the two groups of limiting rings.

7. The bag-type air spring assembly according to any one of claims 1 to 5, characterized in that: The rolling plate assembly includes an end plate, which is provided with at least one group of mounting holes, and each group of mounting holes is welded with a group of air pipe joints. The outer ring of the end plate is provided with a riveted edge that is rolled toward the airbag, and the upper end of the airbag is inserted into the riveted edge and the upper end of the airbag is also connected to a steel wire ring.

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