CN112211941B

CN112211941B - Adjustable air spring

Info

Publication number: CN112211941B
Application number: CN202010949830.4A
Authority: CN
Inventors: 王朝锐; 胡占芳; 郑敏; 桂敏; 蒋玲珑
Original assignee: Dongfeng Motor Corp
Current assignee: Dongfeng Motor Corp
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2021-12-21
Anticipated expiration: 2040-09-10
Also published as: CN112211941A

Abstract

The invention relates to an adjustable gas spring, which belongs to the technical field of gas springs and comprises a cylinder body, a piston 2, a piston rod 3 and a sleeve 4, wherein a closed cavity is arranged in the cylinder body, one end of the cylinder body is provided with a first opening communicated with the closed cavity, the piston is arranged in the closed cavity and is connected with the cylinder body in a sliding and sealing manner, the closed cavity is divided into a first cavity and a second cavity by the piston, the first cavity is communicated with the second cavity through a connecting hole, one end of the piston rod is connected with the piston, the other end of the piston rod penetrates through the first opening, the sleeve is sleeved outside the piston rod and is connected with the piston rod in a sliding and sealing manner, one end of the sleeve is detachably connected with the piston, and the other end of the sleeve penetrates through the first opening and is connected with the first opening in a sliding and sealing manner. Through the connection or the separation of the sleeve and the piston, the stress area of the end face of the piston of the cavity in which the sleeve is positioned can be changed, so that the output force of the piston rod is changed.

Description

Adjustable air spring

Technical Field

The invention belongs to the technical field of gas springs, and particularly relates to an adjustable gas spring.

Background

The gas spring is an industrial accessory which can play a role in supporting, buffering, braking, height adjustment, angle adjustment and the like, and the working principle is that inert gas or oil-gas mixture is filled in a closed pressure cylinder, so that the pressure in a cavity is several times or dozens of times higher than the atmospheric pressure, and the motion of a piston rod is realized by utilizing the pressure difference generated by the fact that the cross section area of the piston rod is smaller than that of a piston. In most car trunk doors, gas springs are used as power-assisting and buffering devices.

However, because geographical position and quarterly change, perhaps ambient temperature changes, gas or oil-gas mixture in the pressure cylinder can produce the change of expend with heat and contract with cold to influence the working property of air spring, when ambient temperature reduced, the output of air spring can reduce, makes reserve railway carriage or compartment door be difficult to open, and when ambient temperature rose, the output of air spring can increase, makes railway carriage or compartment reserve railway carriage or compartment door be difficult to close.

Disclosure of Invention

In view of this, the present invention provides a gas spring to overcome the defects in the prior art, so as to solve the technical problem of the prior art that the gas or the oil-gas mixture in the pressure cylinder generates thermal expansion and cold contraction to change the working performance of the gas spring.

The invention is realized by the following technical scheme:

an adjustable gas spring comprising:

a cylinder body, a closed cavity is arranged in the cylinder body, one end of the cylinder body is provided with a first opening communicated with the closed cavity,

the piston is arranged in the closed cavity and is connected with the cylinder body in a sliding and sealing manner, the closed cavity is divided into a first cavity and a second cavity by the piston, the first cavity is communicated with the second cavity through a connecting hole,

one end of the piston rod is connected with the piston, the other end of the piston rod penetrates through the first opening,

the sleeve is sleeved outside the piston rod and connected with the piston rod in a sliding and sealing mode, one end of the sleeve is detachably connected with the piston, and the other end of the sleeve penetrates through the first opening and is connected with the first opening in a sliding and sealing mode.

Optionally, in order to better implement the present invention, a first groove adapted to the sleeve is provided on the piston, and the sleeve is detachably connected to the first groove.

Alternatively, to better implement the present invention, the sleeve is threadedly coupled to the first groove.

Alternatively, in order to better implement the present invention, the sleeve is connected with the piston in a rotating and buckling manner.

Optionally, in order to better implement the present invention, a clamping head is disposed on an outer wall of the sleeve, a fastening groove adapted to the clamping head is disposed in the first groove, and the clamping head is inserted into the fastening groove to rotate to connect the sleeve and the piston.

Optionally, in order to better implement the present invention, an inner wall of the first opening is provided with a first sealing ring, and the sleeve is connected with the first opening in a sliding and sealing manner through the first sealing ring.

Optionally, in order to better implement the present invention, a second sealing ring is disposed on an outer wall of the piston rod or an inner wall of the sleeve, and the piston rod and the sleeve are connected in a sliding sealing manner through the second sealing ring.

Optionally, in order to better implement the present invention, a side wall of the piston is provided with a third sealing ring, and the piston is connected with the cylinder body in a sliding and sealing manner through the third sealing ring.

Optionally, in order to better implement the present invention, a connecting lug is disposed at both an end of the piston rod away from the cylinder and an end of the cylinder away from the piston rod.

Optionally, in order to better implement the present invention, a stopper for limiting the movement of the sleeve is provided on the piston rod.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the sleeve is connected with the outer wall of the piston in a sliding and sealing manner, the sleeve is detachably connected with the piston, the sleeve is connected with the first opening in a sliding and sealing manner, when the output force of the piston rod needs to be increased, the sleeve is separated from the piston, so that the stress area of the piston in the second chamber is the area obtained by subtracting the end surface area of the piston rod from the end surface area of the piston, the stress area of the piston is minimized, and the output force of the piston rod is maximized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the sleeve and piston of the present invention in the configuration when connected;

FIG. 2 is a schematic view of the sleeve of the present invention shown separated from the piston;

FIG. 3 is a partial enlarged view of the first opening of the present invention;

fig. 4 is a schematic structural view of another connection mode of the piston and the sleeve.

In the figure: 1-a cylinder body; 11-a first opening; 12-a first chamber; 13-a second chamber; 2-a piston; 21-a first groove; 22-a second groove; 3-a piston rod; 31-a stopper; 4-a sleeve; 5-connecting lugs; 61-a first sealing ring; 62-a second seal ring; 71-L type buckling groove; 72-chuck.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Example 1:

an adjustable gas spring, as shown in fig. 1 and 2, comprising: the cylinder comprises a cylinder body 1, a piston 2, a piston rod 3 and a sleeve 4, wherein a closed cavity is arranged in the cylinder body 1, high-pressure inert gas or hydraulic oil or oil-gas mixture is filled in the closed cavity as a medium, the closed cavity in the cylinder body 1 is cylindrical or square column-shaped, the shape of the inner cavity of other cylinders can be the same, and one end of the cylinder body 1 is provided with a first opening 11 communicated with the closed cavity. The external shape of piston 2 and airtight cavity looks adaptation, piston 2 locate in the airtight cavity and with cylinder body 1 sliding seal connect to make piston 2 divide into first cavity 12 and second cavity 13 with airtight cavity, first cavity 12 and second cavity 13 pass through the connecting hole intercommunication, the connecting hole is tiny damping hole, so that the slow circulation of gas between first cavity 12 and the second cavity 13 is until the atmospheric pressure of first cavity 12 equals with the atmospheric pressure of second cavity 13. One end and the piston 2 of piston rod 3 are connected, and first opening 11 is passed to the other end of piston rod 3, and sleeve 4 cover is located outside piston rod 3 and is connected with piston rod 3 sliding seal to guarantee sleeve 4 at the slip in-process, the gaseous junction of sleeve 4 and piston rod 3 can not be revealed from the airtight cavity intracavity encapsulation. One end of the sleeve 4 is detachably connected with the piston 2, and the other end of the sleeve passes through the first opening 11 and is connected with the first opening 11 in a sliding and sealing manner, so that the gas encapsulated in the sealed cavity can not leak from the joint of the sleeve 4 and the first opening 11 in the sliding process of the sleeve 4.

Be equipped with the dog 31 of restriction sleeve 4 removal on the piston rod 3, the dog 31 is fixed in on the lateral wall of piston rod 3 and is kept away from cylinder body 1, and after sleeve 4 and piston 2 separated, dog 31 can form spacingly to the tip of sleeve 4 to guarantee that dog 31 can not separate with first opening 11 department.

According to the formula F × S, the acting force F1 of the first chamber 12 on the piston 2 is P1 × S1, where P1 is the air pressure in the first chamber 12, S1 is the force-receiving area of the piston 2 in the first chamber 12, and the acting force F2 of the second chamber 13 on the piston 2 is P2 × S2, where P2 is the air pressure in the second chamber 13, and S2 is the force-receiving area of the piston 2 in the second chamber 13. The difference in the acting force between F1 and F2 is the output force of the piston rod 3.

Through arranging the sliding sleeve 4 on the piston rod 3, a user can selectively connect or separate the sleeve 4 and the piston 2, when the external temperature is reduced, a medium filled in the cylinder body 1 can contract under the action of expansion with heat and contraction with cold, according to the formula F, the air pressure of the first chamber 12 and the air pressure of the second chamber 13 are both reduced, so that the output force of the air spring is reduced, the car trunk door of the car trunk can be opened only by large force, at the moment, the sleeve 4 is adjusted as shown in figure 2, so that the sleeve 4 is separated from the piston 2, the stressed area of the second chamber 13 is increased, the output force of the air spring is correspondingly increased, the opening of the trunk door of the car trunk is facilitated, and similarly, when the external temperature is increased, the air pressure of the first chamber 12 and the air pressure of the second chamber 13 are both increased, so that the output force of the air spring is increased, at this time, the sleeve 4 is adjusted, as shown in fig. 1, so that the sleeve 4 is connected with the piston 2, and the stressed area of the second chamber 13 is reduced, so as to achieve the purpose of reducing the output force of the gas spring, and facilitate the closing of the trunk door.

It is worth mentioning that the length of the sleeve 4 is larger than the movable distance of the piston 2 in the cylinder 1, so as to ensure that the sleeve 4 is always in sliding sealing connection with the first opening 11 during the movement of the sleeve 4.

As shown in fig. 1 and 2, a first groove 21 adapted to the sleeve 4 is formed in the piston 2, a first internal thread is formed in the first groove 21, a first external thread adapted to the first internal thread is formed at one end of the sleeve 4 close to the piston 2, and the sleeve 4 is detachably connected to the first groove 21 after the first internal thread and the first external thread are connected to each other in a threaded manner.

As shown in fig. 3, a first sealing groove is formed in an inner wall of the first opening 11, a first sealing ring 61 is installed in the first sealing groove, and the sleeve 4 is connected with the first opening 11 in a sliding sealing manner through the first sealing ring 61. The first sealing ring 61 is arranged on the inner wall of the first opening 11, so that the sliding sealing between the sleeve 4 and the first opening 11 can be ensured all the time in the sliding process. The first seal 61 may be an O-ring seal, or may be a seal such as an oil seal or a dust seal that can slidably seal the first opening 11 and the sleeve 4.

As shown in fig. 3, a second sealing groove is formed in an outer wall of the piston rod 3 or an inner wall of the sleeve 4, and a second sealing ring 62 is installed in the second sealing groove, so that the piston rod 3 and the sleeve 4 are connected in a sliding sealing manner through the second sealing ring 62. The second seal ring 62 may be an O-ring, or may be a seal ring such as an oil seal ring or a dust seal ring that can achieve sliding sealing between the piston rod 3 and the sleeve 4.

The lateral wall of piston 2 is equipped with the third seal groove, installs the third sealing washer in the third seal groove for piston 2 is through third sealing washer and cylinder body 1 sliding seal connection. The third sealing ring may be an O-ring, or an oil seal sealing ring or a dust seal sealing ring, etc. which can realize sliding sealing between the piston 2 and the inner wall of the cylinder body 1.

When the piston rod 3 is detachably connected to the piston 2, as shown in fig. 1, the piston rod 3 is provided with a second groove 22, a notch of the second groove 22 is located at a bottom of the first groove 21, an inner wall of the second groove 22 is provided with a second internal thread, one end of the piston rod 3 close to the piston 2 is provided with a second external thread adapted to the second internal thread, and the piston rod 3 is connected to the piston 2 by the threaded connection between the second external thread and the second internal thread.

A connection hole (not shown) is provided on the piston 2 or the cylinder 1. When the connection hole is provided on the piston 2, the connection hole is a damping hole penetrating the piston 2. When the connecting hole sets up on cylinder body 1, the both ends of connecting hole communicate first cavity 12 and second cavity 13 respectively, and, the one end that the connecting hole is located first cavity 12 is located the bottom of first cavity 12, the bottom of first cavity 12 is the one end that piston 2 was kept away from to first cavity 12, the one end that the connecting hole is located second cavity 13 is located the bottom of second cavity 13, the first step of second cavity 13 is the one end that piston 2 was kept away from to second cavity 13, it is easy to think of, the connecting hole also can be realized through connecting tube, be connected the both ends of connecting tube with the both ends of cylinder body 1 respectively, thereby make the both ends of connecting tube communicate first cavity 12 and second cavity 13.

As shown in fig. 1, a connecting lug 5 is disposed at both an end of the piston rod 3 away from the cylinder 1 and an end of the cylinder 1 away from the piston rod 3. When the gas spring is used for a trunk door of an automobile, the connecting lug 5 on the cylinder body 1 is connected with the automobile body, and the connecting lug 5 on the piston rod 3 is connected with the trunk door.

Example 2:

in this embodiment, as shown in fig. 4, the sleeve 4 and the piston 2 may be detachably connected by a rotational fastening method, as shown in fig. 3, a fastening head 72 is disposed on an outer wall of the sleeve 4, an L-shaped fastening groove 71 is disposed on an inner wall of the first groove 21, one end of the L-shaped fastening groove 71 is communicated with an edge of the first groove 21, and the fastening head 72 is fixed in the L-shaped fastening groove 71 by the rotational fastening method, so as to fixedly connect the sleeve 4 and the piston 2 together. The number of the clamping heads 72 is one or more, the number of the L-shaped buckling grooves 71 is the same as that of the clamping heads 72, and each L-shaped buckling groove 71 corresponds to one clamping head 72. It is easy to think that the L-shaped fastening groove 71 can also be replaced by an annular fastening groove, which is composed of an annular groove and a connecting groove, the connecting groove connects the edge of the first groove 21 with the annular groove, and the chuck 72 rotates after passing through the connecting groove, so that the chuck 72 is connected with the annular fastening groove in a rotating and fastening manner.

The rest of the structure of this embodiment is the same as embodiment 1.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. An adjustable gas spring, comprising:

the sleeve is sleeved outside the piston rod and is connected with the piston rod in a sliding and sealing manner, one end of the sleeve is detachably connected with the piston, the other end of the sleeve penetrates through the first opening and is connected with the first opening in a sliding and sealing manner,

the piston is provided with a first groove matched with the sleeve, and the sleeve is detachably connected with the first groove.

2. An adjustable gas spring as set forth in claim 1 wherein: the sleeve is in threaded connection with the first groove.

3. An adjustable gas spring as set forth in claim 1 wherein: the sleeve is connected with the piston in a rotating and buckling manner.

4. An adjustable gas spring as set forth in claim 3 wherein: the outer wall of the sleeve is provided with a clamping head, a buckling groove matched with the clamping head is formed in the first groove, and the clamping head is inserted into the buckling groove to rotate so as to connect the sleeve with the piston.

5. An adjustable gas spring as set forth in any one of claims 1-3 wherein: the inner wall of the first opening is provided with a first sealing ring, and the sleeve is connected with the first opening in a sliding and sealing mode through the first sealing ring.

6. An adjustable gas spring as set forth in claim 5 wherein: and a second sealing ring is arranged on the outer wall of the piston rod or the inner wall of the sleeve, and the piston rod is connected with the sleeve in a sliding and sealing mode through the second sealing ring.

7. An adjustable gas spring as set forth in claim 6 wherein: and a third sealing ring is arranged on the side wall of the piston, and the piston is connected with the cylinder body in a sliding and sealing manner through the third sealing ring.

8. An adjustable gas spring as set forth in claim 1 wherein: and one end of the piston rod, which is far away from the cylinder body, and one end of the cylinder body, which is far away from the piston rod, are both provided with connecting lugs.

9. An adjustable gas spring as set forth in claim 1 wherein: and the piston rod is provided with a stop dog for limiting the movement of the sleeve.