CN201090650Y - Air bag type gas spring - Google Patents

Abstract

The utility model relates to a gasbag air spring which comprises a cylinder body, a cylinder cover and a framework respectively fixed at the two opening ends of the cylinder body, a piston arranged inside the cylinder body, and a piston rod which is connected with the piston and has one end stretching out of the cylinder body. The gasbag air spring also includes a gasbag sealedly fixed inside the cylinder body, and an air valve communicated with the interior of the gasbag. The gasbag air spring with such a structure is easy to install, dismantle and repair, and is good in sealing performance, low in cost and convenient in peroration, which can charge and discharge the gasbag and can adjust the operating stroke through controlling the air pressure inside the gasbag.

Description

Air bag type gas spring

technical field

The utility model relates to an air spring, in particular to an air bag type air spring.

Background technique

Gas spring is a kind of energy storage component, which forms the extension thrust of the piston rod by storing and releasing the gas pressure energy, and is currently widely used in various industries. The two-chamber gas spring in the prior art mainly includes a cylinder body, a damping piston, a piston rod and an isolation piston. An air cavity and a liquid cavity are arranged in the cylinder body, and the gas and liquid are separated through the isolation piston, and the piston rod is connected with the damping piston and arranged on one side of the liquid cavity. When working, the piston rod is pressed into the cylinder to push the damping piston to move axially and squeeze the oil, and the oil forces the isolation piston to move axially to one side of the air chamber, thereby compressing the gas and completing the energy storage step. When the external force disappears, the gas in the air chamber expands, pushing the isolation piston to move to the side of the oil chamber, and the oil pushes the damping piston back, and the damping piston is stopped by the rolling groove protruding from the inner wall of the cylinder, thereby realizing positioning. In the whole device, the damping motion is realized through the damping hole in the damping piston or the damping groove on the inner wall of the cylinder (the damping piston is always in the oil).

However, the existing gas springs have the following problems: because the isolation piston needs to effectively isolate the gas from the liquid, high-precision cooperation must be used between the isolation piston and the cylinder body. However, the higher the precision, the greater the frictional force between the isolation piston and the cylinder body. The larger it is, the harder it is to press into the piston rod; otherwise, the performance of the gas spring will be poor; therefore, the gas spring with this structure will increase the production cost, shorten the service life, and inconvenient to operate. In addition, when resetting, there will be a locking force between the damping piston and the rolling groove, which will easily make the damping piston unable to move relative to the cylinder body, so it is necessary to increase the thrust of the piston rod at this time, but increasing the thrust will easily cause the damping piston or rolling groove. The deformation affects the stroke and reduces the tensile strength; and because the processing accuracy of the rolling groove is not high, the working stroke is inconsistent, and the existing gas spring cannot be repaired and disassembled, so that the working stroke cannot be adjusted.

Utility model content

The technical problem to be solved by the utility model is to provide an airbag-type air spring, which has low manufacturing cost, light operation, stable working stroke, long service life, can be inflated and deflated, and is convenient for maintenance and disassembly.

The purpose of the invention of the utility model is achieved through the following technical solutions:

The airbag-type gas spring of the present invention comprises a cylinder body, a cylinder cover and a frame fixed at both opening ends of the cylinder body, a piston arranged inside the cylinder body, and a piston rod connected with the piston and extending out of the cylinder body at one end, and is characterized in that: It also includes an air bag sealed and fixed inside the cylinder body, and an air valve communicated with the air chamber inside the air bag.

On the basis of the above structure, among them:

The air bag is arranged on a side adjacent to the cylinder head, and the air valve is arranged on the cylinder head.

The air bag is crimped on the cylinder body through a snap ring, and a sealing sleeve for sealing is provided between the snap ring and the cylinder head, and a sealing sleeve is provided on the cylinder body to limit the position of the snap ring. limit block.

At least one damping groove is recessed on the inner wall of the cylinder, and the depth of the damping groove gradually decreases from one end adjacent to the airbag to the other end.

The inner walls at both ends of the cylinder body are provided with internal threads, and the outer walls of the cylinder head and the frame are respectively provided with external threads matching the internal threads at both ends of the cylinder body.

The skeleton has a bottom and a cylindrical structure extending from the bottom to the inside of the cylinder, and at least one through hole is arranged on the cylindrical structure.

The piston rod passes through the cylindrical structure and the bottom of the skeleton, and a skeleton oil seal is respectively provided between the piston rod and the inner wall of the cylindrical structure and between the cylinder body and the outer wall of the cylindrical structure.

A gasket is provided between the framework oil seal and the framework.

There is a gasket for sealing between the end surface of the cylinder body and the frame.

The outer side of the cylinder head is provided with an installation hole for installing the air bag type gas spring.

The beneficial effects of the utility model are as follows: 1. The device is easy to be disassembled and maintained through the threaded cooperation between the cylinder body, the cylinder head and the skeleton, and the sealing performance is good and the cost is low. 2. The airbag cooperates with the cylinder body through the snap ring, and due to the setting of the air valve, the airbag can be inflated and deflated, so as to control the air pressure in the airbag to achieve the effect of limiting the piston stroke. 3. The end face of the cylindrical structure in the skeleton fits closely with the end face of the piston, which can realize good positioning of the piston. 4. Due to the damping groove on the cylinder body, the requirements for the precision of the piston are not high, which reduces the cost. 5. The piston always moves in the oil, with small frictional resistance and easy operation.

Description of drawings

For ease of description, the utility model is described in detail by the following preferred embodiments and accompanying drawings.

Fig. 1 is the structural representation of the utility model air bag type gas spring;

Fig. 2 is the front view of the skeleton of air bag type gas spring in the utility model;

Fig. 3 is a sectional view along A-A direction in Fig. 2 .

Detailed ways

Provide the preferred example of the present utility model below in conjunction with accompanying drawing 1, to describe the technical scheme of the present utility model in detail.

As shown in FIG. 1 , the airbag type gas spring device of the present invention includes a cylinder body 1 , a skeleton 2 , a skeleton oil seal 3 , a piston 4 , a piston rod 5 , a cylinder head 6 , an air valve 7 and an airbag 8 .

The skeleton 2 and the cylinder head 6 are respectively arranged at the two open ends of the cylinder body 1, and the inner walls at both ends of the cylinder body 1 are provided with internal threads, and the outer walls of the skeleton 2 and the cylinder head 6 are provided with external threads, and through the internal threads and the external threads The cylinder body 1 is locked and connected with the skeleton 2 and the cylinder head 6 through cooperation. In this embodiment, the cylinder body 1 , frame 2 and cylinder head 6 are all made of metal.

Please refer to FIG. 2 and FIG. 3 for the structure of the frame 2 , which has a cylindrical structure 22 extending from the bottom 20 . After the skeleton 2 and the cylinder body 1 are assembled, a gasket 9 is provided between the end surface of the cylinder body 1 and the bottom 20 of the skeleton 2 to make the thread fit with good sealing performance. The cylindrical structure 22 of the frame 2 is located inside the cylinder 1 and is adjacent to the piston 4 inside the cylinder 1 . When the piston 4 is reset, the end surface of the piston 4 is attached to the end surface of the cylindrical structure 22 . One end of the piston rod 5 is fixedly connected to the piston 4 , and the other end passes through the cylindrical structure 22 of the frame 2 and protrudes from the cylinder body 1 . In this embodiment, the piston 4 and the piston rod 5 are fixed by riveting.

Between the inner wall of the cylindrical structure 22 of the skeleton 2 and the outer wall of the piston rod 5 and between the outer wall of the cylindrical structure 22 and the inner wall of the cylinder body 1, the skeleton oil seal 3 is respectively installed. In this embodiment, The fit between the skeleton oil seal 3 , the skeleton 2 and the piston rod 5 is an interference fit, and an inner gasket 10 a and an outer gasket 10 b are provided between the skeleton oil seal 3 and the bottom 20 of the skeleton. At least one through hole 24 is provided on the side wall of the cylindrical structure 22 of the skeleton 2, and the through hole 24 can make the oil and liquid communicate between the inner and outer sides of the cylindrical structure 22. In this embodiment, the through hole 24 is pair.

The airbag 8 isolates the gas and liquid in the cylinder body 1, and the airbag 8 is crimped on the side of the cylinder body 1 adjacent to the cylinder head 6 through the snap ring 11. A sealing sleeve 12 for sealing, and a limiting block 13 for limiting the snap ring 11 is press-fitted on the cylinder body 1 .

In this embodiment, the air valve 7 is arranged on the cylinder head 6, and the air valve 7 communicates with the air cavity 80 inside the air bag 8, and the air bag 8 can be inflated or deflated through the air valve 7, so as to This controls the air pressure inside the air bag 8, thereby realizing the effect of adjusting the working stroke of the piston 4. The setting of the air valve 7 is easy to repair and disassemble, and is not afraid of gas leakage. At least one installation hole 60 is also provided on the outer side of the cylinder head 6 for installing the entire air bag type gas spring into an external device.

At least one damping groove 14 is provided in the middle of the side wall of the cylinder body 1 . In this embodiment, the number of the damping grooves 14 is a pair, and the shape of the damping groove 14 is triangular. The depth of the damping groove 14 gradually decreases from the end adjacent to the airbag 8 to the end adjacent to the piston 4 , and the damping groove 14 is formed by recessing from the inner wall of the cylinder 1 to the outside of the cylinder 1 .

When the whole device is working, first press the piston rod 5 into the cylinder body 1, the piston rod 5 pushes the piston 4 and squeezes the oil inside the cylinder body 1, and the oil in the upper oil chamber 15a flows into the lower oil through the damping groove 14 In the chamber 15b, the piston 4 squeezes the oil and compresses the gas in the air bag 8, so that the volume of the air chamber 80 in the air bag 8 changes, and finally reaches the maximum working stroke; when the external force on the piston rod 5 disappears, the piston rod 5 pops up, and the piston 4 The oil in the lower oil chamber 15b is pressed into the upper oil chamber 15a through the damping groove 14, the gas in the air bag 8 recovers, and the piston 4 moves to the end surface of the cylindrical structure 22 of the skeleton 2 for positioning. In addition, inflation and deflation can be performed through the air valve 7, so as to adjust the air pressure in the airbag 8 to control the working stroke.

In other embodiments of the present utility model, the air valve 7 can be directly arranged on the cylinder body 1 and communicated with the air chamber inside the airbag 8, so as to achieve the functions of charging and discharging air and controlling the air pressure.

The cylinder head 6 and the frame 2 of this device cooperate with the cylinder body 1 through threads, so that the device is easy to disassemble and maintain, and has good sealing performance. Because the positioning of the piston 4 is good and always works in the oil, the machining accuracy of the piston 4 can be reduced to reduce the cost, and the friction between the piston 4 and the cylinder 1 is reduced due to the reduction of the precision of the piston 4. Therefore, the working stroke of the device is more stable and the operation is more convenient. Due to the setting of the air valve 7 of the utility model, the device is easy to disassemble and is not afraid of air leakage. In addition, the working stroke of the piston 4 and the piston rod 5 can be adjusted arbitrarily by controlling the air pressure in the air bag 8 .

The specific implementation described above is a preferred implementation of the present utility model, and is not intended to limit the specific implementation scope of the present utility model. All equivalent changes made according to the shape and structure of the utility model are under the protection of the utility model. within range.

Claims (10)

1. A kind of air bag type gas spring, comprise cylinder body, be fixed on the cylinder cover of two open ends of cylinder body and skeleton, be arranged on the piston inside cylinder body and link to each other with piston and the piston rod that one end stretches out cylinder body, it is characterized in that: It also includes an air bag sealed and fixed inside the cylinder body, and an air valve communicated with the air chamber inside the air bag. 2. The airbag-type gas spring according to claim 1, wherein the airbag is arranged on a side adjacent to the cylinder head, and the air valve is arranged on the cylinder head. 3. The airbag-type gas spring according to claim 2, characterized in that: the airbag is crimped on the cylinder body through a snap ring, and a sealing ring is provided between the snap ring and the cylinder head. The sealing sleeve is also provided with a limit block on the cylinder to limit the position of the snap ring. 4. The airbag-type gas spring according to claim 1, characterized in that: at least one damping groove is recessed on the inner wall of the cylinder, and the depth of the damping groove gradually changes from one end adjacent to the airbag to the other end. Small. 5. The air bag-type gas spring according to claim 1, characterized in that: the inner walls at both ends of the cylinder body are provided with internal threads, and the outer walls of the cylinder head and the frame are respectively provided with internal threads corresponding to the two ends of the cylinder body. mating external thread. 6 . The airbag-type gas spring according to claim 1 , wherein the frame has a bottom and a cylindrical structure extending from the bottom to the inside of the cylinder body, and at least one through hole is provided on the cylindrical structure. 7 . 7. The air bag type gas spring according to claim 6, characterized in that: the piston rod passes through the cylindrical structure and the bottom of the skeleton, and is between the piston rod and the inner wall of the cylindrical structure and the Skeleton oil seals are respectively arranged between the cylinder body and the outer wall of the cylindrical structure. 8. The air bag type gas spring according to claim 7, characterized in that: a sealing gasket is provided between the frame oil seal and the frame. 9. The air bag type gas spring according to claim 1, characterized in that there is a gasket for sealing between the end surface of the cylinder body and the frame. 10. The airbag-type gas spring according to claim 1, wherein an installation hole for installing the airbag-type gas spring is provided on the outside of the cylinder head.

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