CN210830276U

CN210830276U - Air spring device

Info

Publication number: CN210830276U
Application number: CN201921850973.9U
Authority: CN
Inventors: 马悦琦
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2020-06-23
Anticipated expiration: 2029-10-29

Abstract

The utility model discloses an air spring device, include: a cylinder body; the first piston is arranged in the cylinder body, the first piston and the cylinder body positioned below the first piston enclose a closed cavity, and pressure gas is filled in the closed cavity; the piston rod is connected to the upper end face of the first piston, the upper end of the piston rod extends out of the cylinder body, the upper end of the piston rod is provided with a first connecting part, and the lower end of the cylinder body is provided with a second connecting part; the second piston is arranged in the cylinder body and used for enclosing a slow pressure cavity with the cylinder body or the first piston, and the slow pressure cavity is communicated with the outside of the cylinder body; the spring is arranged in the pressure relief cavity and used for pushing the second piston; wherein: the action timing of the second piston is configured to: when the first piston compresses the pressure gas to make the pressure of the pressure gas be greater than the preset pressure, the pressure gas overcomes the elastic force of the spring to push the second piston.

Description

Air spring device

Technical Field

The utility model relates to an air spring device.

Background

The air spring has better soft buffer effect and is mostly used as the shock-absorbing device of the moving vehicle, in particular to the shock-absorbing device of a light moving vehicle. The principle that the air spring is used for buffering vibration is as follows: air (a plurality of inert gases) with pressure higher than atmospheric pressure is sealed in the cylinder body by the piston, and when impact is generated due to vibration, the piston drives the piston rod (or called connecting rod) to buffer the vibration by compressing the air by utilizing the compressibility of the air.

It is easy to understand that when compressed by the piston, the gas in the cylinder always has a certain resistance to the piston, and the resistance increases with the increase of the compressed amount of the air, and the increase of the resistance is not in a linear relationship with the displacement amount of the piston, but is similar to an exponential relationship, that is, when the displacement amount of the piston reaches a certain degree, the resistance of the air in the cylinder to the piston becomes extremely large, which makes the rigidity of the whole air spring extremely large, and further makes the whole air spring approach to a rigid body, so that in this case, the air spring loses the cushioning effect, and this phenomenon happens just after the vehicle is greatly impacted, which is a very bad result.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned technical problem that exists among the prior art, the embodiment of the utility model provides an air spring device.

For solving the technical problem, the embodiment of the utility model adopts the following technical scheme:

an air spring assembly comprising:

a cylinder body;

the first piston is arranged in the cylinder body, the first piston and the cylinder body positioned below the first piston enclose a closed cavity, and pressure gas is filled in the closed cavity;

the piston rod is connected to the upper end face of the first piston, the upper end of the piston rod extends out of the cylinder body, the upper end of the piston rod is provided with a first connecting part, and the lower end of the cylinder body is provided with a second connecting part;

the second piston is arranged in the cylinder body, and is used for enclosing a slow pressure cavity with the cylinder body or the first piston, and the slow pressure cavity is communicated with the outside of the cylinder body;

the spring is arranged in the pressure relief cavity and used for pushing the second piston; wherein:

the action timing of the second piston is configured to: when the first piston compresses the pressure gas to enable the pressure of the pressure gas to be larger than the preset pressure, the pressure gas overcomes the elastic force of the spring to push the second piston.

Preferably, the second piston is arranged below the first piston, and the closed cavity is arranged between the second piston and the second piston; the pressure relief cavity is between the second piston and the lower end of the cylinder body.

Preferably, the lower end of the cylinder body is provided with a lower end cover which is detachably connected, and the slow-pressure cavity is arranged between the second piston and the lower end cover, wherein:

an annular stop step is arranged on the inner wall of the cylinder body close to the lower part;

the spring arranged in the pressure relief cavity pushes the second piston upwards to enable the upper end of the second piston to be abutted against the stop step;

and the lower end cover is provided with a through air guide hole, so that the pressure relief cavity is communicated with the outside of the cylinder body through the air guide hole.

Preferably, the lower end of the air guide hole is covered with a sheet-shaped filter felt, and the sheet-shaped filter felt is fixed by a pressing ring.

Preferably, a guide cavity is formed upwards from the lower end surface of the first piston; the second piston is arranged in the guide cavity, and the second piston and the guide cavity above the second piston enclose the slow-pressure cavity; wherein:

a stop sleeve is screwed on the first piston below the second piston;

the spring arranged in the pressure relief cavity pushes the second piston downwards so that the lower end of the second piston is abutted against the upper end of the stop sleeve;

and the first piston is provided with an air guide hole which is used for communicating the slow pressure cavity with the cavity above the first piston.

Preferably, a sealing ring is arranged between the part of the lower end cover extending into the cylinder body and the inner wall of the cylinder body.

Preferably, the upper end of the cylinder body is in threaded connection with an upper end cover; the piston rod penetrates out of the upper end cover, and an annular filter felt is arranged between the upper end cover and the piston rod.

Compared with the prior art, the utility model discloses an air spring device's beneficial effect is: the utility model provides an air spring device is suffering the transient later stage of great impact, and its rigidity is unlikely to too high, avoids the device to form the rigid body.

Drawings

In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having letter suffixes or different letter suffixes may represent different instances of similar components. The drawings illustrate various embodiments, by way of example and not by way of limitation, and together with the description and claims, serve to explain the embodiments of the invention. The same reference numbers will be used throughout the drawings to refer to the same or like parts, where appropriate. Such embodiments are illustrative, and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

Fig. 1 is a schematic structural view of an air spring device according to embodiment 1 of the present invention.

Fig. 2 is a view showing a state in which a spring is contracted in an air spring device according to embodiment 1 of the present invention.

Fig. 3 is an enlarged view of a portion a of fig. 2.

Fig. 4 is a schematic structural view of an air spring device according to embodiment 2 of the present invention.

Fig. 5 is a view showing a state in which a spring is contracted in an air spring device according to embodiment 2 of the present invention.

Fig. 6 is an enlarged view of a portion B of fig. 5.

Reference numerals:

10-cylinder 10; 11-a closed cavity; 11' -a closed cavity; 12-a reduced pressure chamber; 12' -a reduced pressure chamber; 121-air vents; 121' -gas-guiding hole; 13-a stop step; 20-a first piston; 20' -a first piston; 21-a piston rod; 30-a second piston; 30' -a second piston; 31' -a stop collar; 40-a spring; 40' -a spring; 50-lower end cap; 50' -lower end cap; 52-sheet filter felt; 53-a pressure ring; 60-upper end cover; 61-annular filter felt; 71-a first connection; 72-second connection.

Detailed Description

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description herein do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

To maintain the following description of the embodiments of the present invention clear and concise, detailed descriptions of well-known functions and components may be omitted.

As shown in fig. 1 to 6, the disclosed embodiment of the present invention discloses an air spring 40, 40' device, which is used to be installed on a light mobile vehicle for relieving impact, i.e., shock absorption.

The air spring 40, 40' arrangement includes: a cylinder 10, a first piston 20, 20 ', a piston rod 21, a second piston 30, 30', an upper end cap 60, a lower end cap 50, 50 ', and a spring 40, 40'.

The upper end cover 60 is screwed to the upper end of the cylinder body 10, and the lower end covers 50, 50' are fixed to the lower end of the cylinder body 10 by means of fasteners; the first piston 20, 20' is disposed in the cylinder 10 and is slidable in the axial direction of the cylinder 10; the lower end of the piston rod 21 is connected to the first piston 20, 20 ', the upper end of the piston rod 21 passes through the upper end cover 60 to extend out of the cylinder 10, and a certain gap is provided between the piston rod 21 and the upper end cover 60 to enable the gas inside the cylinder 10 and outside the cylinder 10 to flow through the gap when the first piston 20, 20' slides up and down; an annular filter felt 61 is provided at the gap to restrict the ingress of external dust into the chamber above the first piston 20, 20' via the gap.

A first connecting portion 71 for connecting with a vehicle frame is formed at the upper end of the piston rod 21, for example, the first connecting portion 71 is a mounting hole; a second connecting portion 72 is formed on the lower end of the cylinder body 10, i.e., the lower end surface of the lower end cap 50, 50', the second connecting portion 72 being used for connecting an impacted member, e.g., a wheel; the second connecting portion 72 is two ear plates disposed oppositely and provided with coaxial mounting holes.

In the present invention, the first piston 20, 20 'and the inside of the cylinder 10 located below the first piston enclose a closed cavity 11, 11', the closed cavity 11, 11 'is filled with an inert gas (pressure gas) larger than atmospheric pressure, and an inflation valve, such as a check valve (not shown in the drawings), is further disposed on the cylinder wall of the cylinder 10 to supplement the gas for the closed cavity 11, 11'. The closed chamber 11, 11' functions to: when the vehicle impacts, the first piston 20, 20 'compresses the gas in the closed chamber 11, 11' to achieve a shock absorbing effect with a certain stiffness (the same effect as that of the closed chamber 11, 11 'of the prior art air spring 40, 40').

In the present invention, the second piston 30, 30 ' is also disposed in the cylinder 10, and the second piston 30, 30 ' is used to form a

slow pressure chamber

12, 12 ' with the cylinder 10 or the second piston 30, 30 ', and the

slow pressure chamber

12, 12 ' is directly or indirectly communicated with the outside.

In the present invention, the spring 40, 40 'is disposed in the

slow pressure chamber

12, 12' and the spring 40, 40 'is in a compressed state, so that the spring 40, 40' always has an elastic action on the second piston 30, 30 ', and the elastic state of the spring 40, 40' is configured as follows: when the pressure of the pressurized gas in the closed chamber 11, 11 ' is greater than a predetermined pressure, the pressurized gas can overcome the elastic force of the spring 40, 40 ' to cause the spring 40, 40 ' to yield and contract. That is, when the pressure of the pressure gas in the closed chambers 11, 11 ' exceeds the predetermined pressure due to the compression of the first pistons 20, 20 ' when the vehicle is impacted, the pressure gas pushes against the second pistons 30, 30 ' to move, and at this time, the volume of the closed chambers 11, 11 ' is instantaneously increased due to the movement of the second pistons 30, 30 ', which inevitably reduces the rising speed of the pressure gas in the closed chambers 11, 11 ', and thus effectively reduces the rigidity of the air springs 40, 40 '.

It should be noted that:

1. the cooperation of the second piston 30, 30 'with the spring 40, 40' not only reduces the rate of rise of the pressure of the pressurized gas in the closed chamber 11, 11 ', but also reduces the maximum value to which the pressure can rise, in that the spring 40, 40' absorbs the impact energy by contracting as the second piston 30, 30 'moves, thereby enabling the air spring 40, 40' arrangement to absorb the impact energy while momentarily reducing the stiffness.

2. By having the

relief chambers

12, 12 'in communication with the outside, it is possible to avoid that the gas in the

relief chambers

12, 12' is compressed, thereby avoiding that the

relief chambers

12, 12 'contribute to an increase in the stiffness of the air spring 40, 40' arrangement.

3. The preset pressure is actually determined by the initial state elastic force (the state of the vehicle when not receiving an impact) of the springs 40, 40', the larger the initial state elastic force, the larger the preset pressure, and vice versa. The smaller the preset pressure is selected, the lower the stiffness of the air spring 40, 40' arrangement in the latter stage of an impact, and vice versa.

Two specific configurations of the air spring 40, 40 'arrangement will now be described based on the location of the formation of the

relief cavity

12, 12'.

Example 1

As shown in fig. 1 to 3, in the present embodiment, the second piston 30 is disposed below the first piston 20, and the closed cavity 11 is interposed between the second piston 30 and the second piston 30; the decompression chamber 12 is interposed between the second piston 30 and the lower end of the cylinder 10. Specifically, the relief pressure chamber is interposed between the second piston 30 and the lower end cap 50, wherein: an annular stopping step 13 is arranged on the inner wall of the cylinder body 10 close to the lower part; the spring 40 arranged in the pressure relief cavity pushes the second piston 30 upwards to enable the upper end of the second piston 30 to abut against the stop step 13; the lower end cover 50 is provided with a through air vent 121, so that the slow pressure cavity 12 is communicated with the outside of the cylinder body 10 through the air vent 121; preferably, the lower end of the air-guide hole 121 is covered with a sheet-shaped filter felt 52, and the sheet-shaped filter felt 52 is fixed by a pressing ring 53.

In this embodiment, when the first piston 20 makes the pressure of the pressure gas in the closed cavity 11 greater than the preset pressure (i.e. can overcome the elastic force of the spring 40), the second piston 30 slides downward to make the closed cavity 11 increase instantaneously (at this time, the spring 40 contracts, and the gas in the pressure-relief cavity 12 can be discharged in time through the gas guide hole 121 and the sheet-in-sheet sealing felt), so as to effectively avoid the pressure of the pressure gas in the closed cavity 11 increasing suddenly, and further effectively reduce the rigidity of the device at this moment, so as to avoid the device at this moment becoming a rigid body.

Example 2

As shown in fig. 4 to 6, in the present embodiment, a guide cavity is opened upward from the lower end of the first piston 20'; the second piston 30 'is arranged in the guide cavity, and the second piston 30' and the guide cavity above the second piston 30 'enclose a pressure-relieving cavity 12'; wherein: a stop sleeve is screwed on the first piston 20 'below the second piston 30'; a spring 40 'disposed in the buffer chamber pushes the second piston 30' downward such that the lower end of the second piston 30 'abuts against the upper end of the stop sleeve 31'; the first piston 20 ' is provided with an air vent 121 ', and the air vent 121 ' is used for communicating the slow pressure cavity 12 ' with a cavity above the first piston 20 '; a sealing ring is arranged between the part of the lower end cover 50' extending into the cylinder body 10 and the inner wall of the cylinder body 10.

In this embodiment, when the first piston 20 ' makes the pressure of the pressure gas in the closed cavity 11 ' greater than the preset pressure (i.e. can overcome the elastic force of the spring 40 '), the second piston 30 ' slides upward to make the closed cavity 11 ' increase instantaneously (at this time, the spring 40 ' contracts, and the gas in the slow pressure cavity 12 ' can be discharged in time through the gas guide hole 121 ' and the annular filter felt 61), so as to effectively avoid the pressure of the pressure gas in the closed cavity 11 ' increasing suddenly, and further effectively reduce the stiffness of the device at this moment, so as to avoid the device at this moment becoming a rigid body.

Moreover, although exemplary embodiments have been described herein, the scope thereof includes any and all embodiments based on the present invention with equivalent elements, modifications, omissions, combinations (e.g., of various embodiments across), adaptations or variations. The elements of the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the present specification or during the prosecution of the application, which examples are to be construed as non-exclusive. It is intended, therefore, that the specification and examples be considered as exemplary only, with a true scope and spirit being indicated by the following claims and their full scope of equivalents.

The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more versions thereof) may be used in combination with each other. For example, other embodiments may be used by those of ordinary skill in the art upon reading the above description. Additionally, in the foregoing detailed description, various features may be grouped together to streamline the disclosure. This should not be interpreted as an intention that a disclosed feature not claimed is essential to any claim. Rather, inventive subject matter may lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the protection scope of the present invention is defined by the claims. Various modifications and equivalents of the invention can be made by those skilled in the art within the spirit and scope of the invention, and such modifications and equivalents should also be considered as falling within the scope of the invention.

Claims

1. An air spring assembly, comprising:

a cylinder body;

2. The air spring assembly of claim 1, wherein said second piston is disposed below said first piston, said closed chamber being interposed between said second piston and said second piston; the pressure relief cavity is between the second piston and the lower end of the cylinder body.

3. Air spring assembly according to claim 2, characterized in that the lower end of the cylinder body is provided with a detachably connected lower end cap, the relief chamber being interposed between the second piston and the lower end cap, wherein:

4. The air spring device according to claim 3, wherein a lower end of the air-guide hole is covered with a sheet-like filter felt, and the sheet-like filter felt is fixed by a pressing ring.

5. The air spring device according to claim 1, wherein a guide chamber is opened upward from a lower end surface of the first piston; the second piston is arranged in the guide cavity, and the second piston and the guide cavity above the second piston enclose the slow-pressure cavity; wherein:

a stop sleeve is screwed on the first piston below the second piston;

6. Air spring assembly according to claim 3, characterized in that a sealing ring is arranged between the portion of the lower end cap which projects into the cylinder body and the inner wall of the cylinder body.

7. The air spring assembly of claim 1 wherein an upper end cap is threadably attached to the upper end of said cylinder body; the piston rod penetrates out of the upper end cover, and an annular filter felt is arranged between the upper end cover and the piston rod.