KR101272807B1 - Tensile gas-spring and the method for injection working gas - Google Patents

Abstract

The present invention relates to a gas spring mounted on a mechanical element or the like in which tension is applied. According to an embodiment of the present invention, a body having an installation space formed therein, a first finishing portion and a second finishing portion coupled to each end of the body, are located in the installation space, and each end of the first finishing portion and the It is hermetically coupled to the second finishing part, the tube having a storage space formed therein, a rod extending through the first finishing part to the storage space, coupled to the rod and sliding in contact with the inner circumferential surface of the storage space. A tension gas spring is provided which includes a possible piston and an actuating gas which is filled between the first closure portion and the piston to pressurize the piston towards the second closure portion.

Description

Tensile gas spring and the method for injection working gas

The present invention relates to a gas spring mounted on a mechanical element or the like in which tension is applied.

Generally, a gas spring is a mechanical spring which fills a cylinder with a compressible gas, such as nitrogen gas, and compresses it like a patent document (1) and patent document (2), and acquires a shock absorbing performance.

Gas springs can be used to reduce elastic modulus and to support large loads even in small sizes.

A common gas spring acts to repel by compression of gas when the piston is compressed into the cylinder.

On the other hand, there is a case where a tension spring other than compression is required in a cover of a machine, a cover of a tank container, or a semiconductor device. Such a mechanical element has a conventional compressed gas spring such as Patent Document (1) or Patent Document (2). This will not be used.

[Patent Document 1] Republic of Korea Patent Publication No. 10-2011-0065059, Publication Date: 2011.06.15 [Patent Document 2] Republic of Korea Patent Publication No. 10-2002-0040202, Publication Date: 2002.05.30

The present invention proposes a gas spring acting on a tensile force. Specifically, the present invention aims to improve productivity and reliability of operation by having a simple structure.

According to an embodiment of the present invention, a tension gas spring includes a tube having a storage space formed therein, a first finishing portion and a second finishing portion connected to both ends of the tube, and passing through the first finishing portion. A rod extending into the storage space, a piston coupled to the rod and slidable in the storage space, and an actuating gas filled between the tube and the rod, wherein the actuating gas is externally provided on the second closing portion. The injection hole is supplied is formed, the rod is formed with a first flow path for introducing the working gas injected through the injection hole into the space between the tube and the rod, the outlet of the first flow path is the first It is equipped with an O-ring to control the outlet of the flow path.
Gas spring for tension according to another embodiment of the present invention, through the tube having a storage space formed therein, the first and second finishing parts connected to each end of the tube, the first finishing part A rod extending into the storage space, a piston coupled to the rod and slidable in the storage space, and an actuating gas filled between the tube and the rod, wherein the rod penetrates the first finishing portion. A second flow path through which the working gas can be injected is formed, and the second flow path is connected to an O-ring mounted along the outer circumferential surface of the rod, and the O-ring intercepts the second flow path.
In accordance with another aspect of the present invention, a body having an installation space formed therein, a first finishing portion and a second finishing portion coupled to each end of the body, are located in the installation space, and each end is disposed at the first space. It is coupled so as to be hermetically sealed to the first closing portion and the second closing portion, a tube having a storage space formed therein, a rod extending through the first closing portion to the storage space, coupled to the rod and the storage space The present invention provides a tensioning gas spring comprising a slidable piston in contact with an inner circumferential surface thereof and a working gas filled between the first closing portion and the piston to press the piston toward the second closing portion.

Here, the rod extends by reducing the diameter at the end of the cylindrical rod body and the cylindrical rod body, the thread may be formed on the outer peripheral surface.

In addition, the piston is provided with a coupling hole for screwing the protrusion portion and an extension hole extending from the coupling hole to surround a portion of the cylindrical rod body, the outer peripheral surface of the at least one sealing coupling groove in contact with the inner peripheral surface of the tube in the circumferential direction Can be formed according to.

In addition, an O-ring is further described between the extension hole and the cylindrical rod, and the mounting groove in which the O-ring is mounted may be formed along the circumferential direction on the outer circumferential surface of the cylindrical rod.

The first finishing part may include a body, a first coupling part protruding from the body and inserted into an end of the body, and a second coupling part protruding from the first coupling part and into which the end of the tube is inserted. A sliding hole through which the rod passes may be formed through the first coupling part and the second coupling part.

Here, each of the end of the rod protruding from the body and the second closing portion is formed with a mounting groove which is detachably coupled to the connecting member, the connecting member is a mounting portion coupled to the mounting groove, and extending from the mounting portion And it may include a hinge piece is formed a hinge hole.

Further, the second closing portion is formed with an injection hole through which the operating gas is supplied from the outside, and the rod has a first flow path for introducing the operating gas injected through the injection hole between the first closing portion and the piston. Is formed, the outlet of the first passage is connected to the O-ring groove recessed along the outer circumferential surface of the rod, the O-ring groove may be equipped with an O-ring to control the outlet of the first passage.

As another example, a second flow passage through which the operating gas is injected is formed inside the rod passing through the first finishing portion, and the second flow passage communicates with an o-ring groove recessed along the outer circumferential surface of the rod. The O-ring groove may be equipped with an O-ring to control the second passage.

Meanwhile, in another embodiment, a body having an installation space formed therein, a first finishing portion and a second finishing portion, to which each end of the body is coupled, are located in the installation space, and each end is connected to the first finishing portion. The tube is hermetically coupled to the second finishing part, and a storage space is formed therein, and at least one communication hole penetrates at one end connected to the first finishing part, and through the first finishing part. A rod extending into the storage space, a piston coupled to an end of the rod, the outer circumferential surface of which is in contact with the inner circumferential surface of the storage space, and a slidable piston; a space between the first finishing portion and the rod; and a space between the tube and the body The present invention provides a tensioning gas spring including a working gas which is filled in to pressurize the piston toward the second closing part.

Here, the auxiliary space formed by separating the inner circumferential surface of the body and a part of the outer circumferential surface of the first closing portion is in communication with the installation space, the installation groove recessed along the circumference of the outer circumferential surface of the second finishing portion forming the auxiliary space Is formed, the installation groove is formed with a gas hole connected to the storage space of the tube, the installation groove may be inserted into the O-ring to intercept the gas hole.

Further, a third flow path for injecting the working gas from the outside is formed in the rod passing through the first closing portion, and a valve structure for intermitting the third flow path is further provided in the rod. Can be.

At this time, the valve structure is formed by recessing one end of the rod toward the second closing portion, is installed in the mounting space in communication with the third passage, the closing member facing the third passage exposed to the mounting space And an elastic member interposed between the cover member and the finishing member to press the finishing member toward the third channel so as to surround the finishing member to be spaced apart from each other.

In addition, the second closing portion is formed with an injection hole through which the operating gas is supplied from the outside, and the piston is formed with a fourth flow path through which the operating gas injected through the injection hole can move between the rod and the tube. The outlet of the fourth flow passage may be connected to an open / close groove recessed along the outer circumferential surface of the piston, and the open / close ring may be equipped with an O-ring for controlling the outlet of the fourth flow passage.

At this time, the inside of the piston is formed with a screw hole forming the fourth flow path, the screw is screwed to the screw hole, the O-ring may be interposed between the screw and the screw hole to prevent the leakage of the working gas. have.

On the other hand, the first and second spaced apart portion, each end is hermetically coupled to the first closure portion and the second closure portion, the tube having a storage space therein, and the first A method of injecting an actuating gas into a tensioning gas spring comprising a rod extending through the finishing portion and extending into the storage space, and a piston coupled to the rod and in contact with an inner circumferential surface of the storage space and slidable. O-ring grooves are coupled to the outer circumferential surface of the rod between the piston, and the operating gas injected into the rod flows into the bottom of the O-ring groove to elastically deform the O-ring in the radial direction and to be injected into the storage space. After the injection of the working gas is completed, the O-ring is restored and seated in the O-ring groove to prevent leakage of the working gas An operating gas injection method of a tension gas spring characterized in that the present invention.

According to the exemplary embodiment of the present invention, a mechanical device such as a tension force applied to the piston as the rod is pulled may be used as the tension spring. In addition, it is possible to reduce the production cost and easy assembly with a simple configuration, thereby improving productivity. In addition, it prevents damage to key parts such as pistons, thereby improving the reliability of long-term operation.

1 is a cross-sectional view of the tension spring according to the first embodiment of the present invention.
2 is a cross-sectional view of the piston and the rod employed in the first embodiment shown in FIG.
3 is a cross-sectional view of the first finishing portion shown in FIG.
4 is a sectional view showing a state of use of the first embodiment shown in FIG.
5 is a sectional view showing the injection of the working gas of the first embodiment shown in FIG.
6 is a cross-sectional view of a tension gas spring according to a second embodiment of the present invention.
7 is a cross-sectional view of a tension gas spring according to a third embodiment of the present invention.
FIG. 8 is a sectional view showing the essential parts of a third embodiment shown in FIG.
9 is a cross-sectional view showing a state of use of the main part shown in FIG.
FIG. 10 is a sectional view showing another principal part of the third embodiment shown in FIG.
11 is an enlarged cross-sectional view of a portion of a gas spring according to a fourth embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described the configuration, function and operation of the gas spring for tension, in accordance with embodiments of the present invention. However, reference numerals for some components that are similar or identical may be used uniformly.

1 is a cross-sectional view of the tension spring according to the first embodiment of the present invention, Figure 2 is a cross-sectional view of the piston and the rod employed in the first embodiment shown in Figure 1, Figure 3 is a first 1 is a cross-sectional view of the finishing portion.

The tension gas spring 10 according to the first embodiment of the present invention has a body 1 having an installation space 11 formed therein, and a first finishing part 2 having each end of the body 1 coupled thereto. And a second finishing part 3 and the installation space 11, each end of which is hermetically coupled to the first finishing part 2 and the second finishing part 3, and has a storage space therein. A tube 4 having 4 formed therein, a rod 5 penetrating through the first closing portion 2 and extending into the storage space 4, and coupled to the rod 5 and the storage space 41. A piston 6 which is in contact with the inner circumferential surface of the slidable and is filled between the first closing part 2 and the piston 6 to pressurize the piston 6 toward the second closing part 3. do.

Here, the body 1 forms an outer shape of the gas spring 10, and is cylindrical in the first embodiment. However, it is not necessarily limited to the cylindrical shape.

The body 1 may protect the impact transmitted from the outside from directly reaching the tube provided therein, and may be made of metal or rigid synthetic resin.

An empty installation space 11 is formed inside the body 1. The shape of the installation space is cylindrical. However, it is not limited only to the cylindrical shape.

Meanwhile, each of the first and second finishing parts 2 and 3 is a member coupled to one end and the other end of the body 1, respectively.

The first closing portion 2 protrudes from the body 21, the first coupling portion 22 and the first coupling portion 22 protruding from the body 21 and inserted into the end of the body 1. The second coupling portion 23 is inserted into the end of the tube (4).

The outer circumferential surface of the first finishing part 2 is sequentially formed stepwise to form the first coupling part 22 and the second coupling part 23. The first coupling part 22 is inserted into and coupled to one end of the body 1. At this time, a recessed groove is formed in the outer circumferential surface of the first coupling portion 22, and the O-ring is coupled to the groove. O-ring further increases the coupling of the first coupling portion 22 and the body 1, and prevents the gas inside the outflow. The coupling of the first coupling portion 22 and the body 1 may be made by a screw coupling or an interference fit method. Alternatively, an adhesive may be interposed between the first coupling part and the coupling surface of the body.

Furthermore, the second coupling part 23 is further protruded from one surface of the first coupling part 22. The second coupling part 23 is coupled to one end of the tube 4.

At this time, the outer diameter of the second coupling portion 23 is smaller than the outer diameter of the first coupling portion 22, the center of the circular cross-section of the second coupling portion 23 is the same as the circular cross-sectional center of the first coupling portion 22. . Therefore, the tube 4 coupled to the second coupling part 23 is spaced apart from the inner circumferential surface of the body 1 and is concentric with the body.

According to the above structure, even if the body 1 is deformed to be deformed by an impact transmitted from the outside, since the tube 4 and the body 1 are spaced apart from each other, the tube 4 is deformed by the deformed body 1. It can prevent damage.

In addition, similar to the first coupling portion 22, the second coupling portion 23 may further include a sealing member such as an O-ring to increase the coupling force with the tube 4 and to increase the airtightness inside the tube 4. have.

In addition, a sliding hole 24 through which the rod 5 passes through the body 21, the first coupling part 22, and the second coupling part 23 is formed. The sliding hole 24 is formed through the center of the first closing portion (2). Sealing members for sealing the inside of the tube are mounted on the inner circumferential surface of the sliding hole 24. The outer seal 241 prevents foreign substances such as dust from being exposed to the rod that has been exposed to the air from entering the inside. On the other hand, the inner seal 242 prevents the inner working gas from flowing out. This double sealing structure ensures foreign material blocking and internal tightness.

Here, the sealing member mounted on the inner circumferential surface of the sliding hole 24 is composed of an elastic body which scrapes off foreign substances adhering to the outer surface of the rod as the rod moves, and an O-ring for preventing leakage of the working gas contained in the tube. In addition, the sealing member may further include a plate-shaped sealing to prevent the leakage of the high-pressure working gas wrapped around the rod.

The second finishing part 3 is provided on the other side of the first finishing part 2 and is a member for fixing the other ends of the body 1 and the tube 4. The outer shape of the second closing part 3 may be the same as the first coupling part 22 and the second coupling part 23 of the first finishing part 2.

Alternatively, the outer shape of the second finishing part may be deformed differently from the first finishing part according to the coupling method of the tube or the body. In detail, the tube may be fixed by welding in the first finishing part. On the other hand, after the piston and the rod is mounted on the tube, the second finishing portion coupled to the other end of the tube may be fitted with the tube. To this end, the second closing portion may be formed with a locking portion that is completely inserted into the other end of the tube.

Each of the surfaces on which the second finishing portion 3 and the body 1 are coupled, and the surfaces on which the second finishing portion 3 and the tube 4 are coupled, are provided with a sealing member similarly to the first finishing portion described above. Can be.

On the other hand, the rod 5 includes a cylindrical rod 51 and a protrusion 52 extending from the end of the cylindrical rod 51 with a smaller diameter and having a thread formed on its outer circumferential surface.

The cylindrical rod 51 is a member that moves in the longitudinal direction while being circumscribed to the sliding hole 24. A protrusion 52 extends at the end of the cylindrical rod 51 inserted into the tube 4. Since the protrusion 52 has an outer diameter smaller than the circumferential diameter of the cylindrical rod 51, the rod 5 passes through the sliding hole 24 to enter the tube 4 during assembly of the gas spring. To be able.

On the other hand, the piston 6 has an outer circumferential surface corresponding to the inner circumferential surface of the tube 4 and slides in contact with the inner circumferential surface of the tube 4. A plurality of sealing members are attached to the outer circumferential surface of the piston 6 so as to contact the inner circumferential surface of the tube 4 as tightly as possible.

In addition, the piston 6 is provided with a coupling hole 61 screwed to the protrusion 52, and an extension hole 62 extending from the coupling hole to surround a portion of the cylindrical rod, and formed on the outer peripheral surface thereof. At least one sealing engagement groove 63 in contact with the inner circumferential surface of the tube 4 is formed along the circumferential direction.

The coupling hole 61 and the extension hole 62 are located on the concentric circles and communicate with each other. As the coupling hole 61 and the extension hole 62 are formed to penetrate the piston 6, the piston 6 has a cylindrical shape with both ends open.

The coupling hole 61 and the extension hole 62 having different inner diameters are coupled to the rod 5 in a shape surrounding a part of the protrusion 52 and the cylindrical rod 51. The piston 6 is screwed with the protrusion 52 by the thread formed in the coupling hole 61. At this time, the extension hole 62 is wrapped around the one end of the cylindrical rod body 51, the protrusion 52 is formed.

In this case, the length of the protrusion 52 extending from the cylindrical rod 51 may be the same as or longer than the length of the coupling hole (61). Accordingly, the end of the piston 6 coupled with the rod 5 is the same as the end surface of the protrusion 52, or the protrusion 52 protrudes further than the end of the piston 6.

In the case where the protrusions 52 and the coupling holes 61 have the same length, the collision with the second closing part 3 caused by the reciprocating motion of the rod 5 is caused by the piston 6 and the protrusions forming one plane. At the same time. As a result, since the impact force is distributed to the rod 5 and the piston 6, the impact force transmitted to the piston 6 can be greatly reduced as compared with the case where the piston completely surrounds the protrusion. As a result, the operating reliability of the gas spring is improved without fear of damage to the piston.

On the other hand, when the protrusion 52 protrudes further than the piston 6, the end of the second closing part 3 and the rod 5, that is, the protrusion 52, collide with each other according to the reciprocating motion of the piston 6. Since the piston 6 does not collide with the second closing portion 3, it is possible to reduce the impact force on the piston for a long period of use and to prevent damage due to the fatigue stress of the piston.

Furthermore, an O-ring is further described between the extension hole 62 and the cylindrical rod 51, and the mounting groove in which the O-ring is mounted is formed along the circumferential direction on the outer circumferential surface of the cylindrical rod 51. The O-ring interposed between the inner circumferential surface of the extension hole 62 and the outer circumferential surface of the cylindrical rod 51 keeps both spaces partitioned before and after the piston 6 moving inside the tube 4 from each other.

As the projecting part and the coupling hole are screwed together, the filled working gas may be moved by the gap between the screwed portions. As the O-ring is interposed between the extension hole 62 and the cylindrical rod 51, the movement of the operating gas is performed. Can be prevented. Therefore, it is possible to maintain a uniform elastic modulus while minimizing the change in the working gas pressure charged during manufacturing.

On the other hand, the working gas is filled between the first closing portion 2 and the piston 6 to press the piston 6 toward the second closing portion (3). Such actuators may be nitrogen gas. However, other gases of high molecular weight and chemical stability may be used.

The working gas is filled in the space defined by the cylindrical rod 51, the tube 4, the first closing portion 2 and the rear end of the piston 6. However, as shown in the third embodiment below, the communication hole formed in the tube 4 may be filled in the installation space 11 between the tube 4 and the body 1. The filled actuator is pressurized as the rod 5 is withdrawn from the tube 4, as shown in FIG. 4, to pressurize the piston 6 towards the second closing portion 3.

Then, when the tension force applied to the rod 5 is released, the piston 6 is pushed into the second closing portion 3 by the pressure of the working gas, so that the rod 5 is in its original position, inside the tube 4 as much as possible. The original position is returned to the inserted position.

On the other hand, at the end of the rod 5 protruding from the body 1 and each of the second closing portion 3 is provided with a mounting groove (H) to which the connection member 7 is detachably coupled. At this time, the thread may be formed on the inner circumferential surface of each mounting groove (H).

In the illustrated first embodiment, the connection member 7 includes a mounting portion 71 coupled to the mounting groove, and a hinge piece 72 extending from the mounting portion and having a hinge hole 721 formed therein.

The connecting member 7 is for coupling both ends to the mechanism in which the tension gas spring is mounted. The hinge piece 72 in which the hinge hole 721 is formed is combined with another hinge coupling member installed in the mechanical device. The mounting portion 71 connected to the hinge piece 72 is detachably coupled to the mounting groove H.

Although not shown, the connection member may be a screw rod extending in parallel with the longitudinal direction of the gas spring, a screw rod formed in a direction perpendicular to the longitudinal direction of the gas spring, or other various fixing means.

The various connecting members can be detachably coupled to the mounting grooves formed at both ends of the gas spring, so that the corresponding connecting member can be selected according to the mounting method that is different for each machine to properly mount the gas spring. As a result, through this connecting member, the gas spring can be installed universally for various mechanical devices.

Gas spring according to the present invention is to receive a tensile force to reduce it. According to the first embodiment of the present invention, since the structure is simple, it is easy to process and assemble, and there is an advantage in that assembly failure is reduced. Therefore, the productivity is improved.

In addition, the leakage of the charged working gas is reduced, and the impact from external shock or sliding operation can be reduced, so that smooth operation is ensured for a long time, thereby improving operation reliability.

FIG. 5 is a cross-sectional view showing the injection of the working gas of the first embodiment shown in FIG.

The second closing part 3 is formed with an injection hole 31 to which the working gas is supplied from the outside. The injection hole 31 may be in communication with the internal flow path 711 formed in the connecting member (7).

The rod 5 is formed with a first flow path 53 for introducing the working gas injected through the injection hole 31 into the space between the first closing part 2 and the piston 6.

In detail, the first passage 53 includes a first passage hole 531 and a second passage hole 532. The first passage hole 531 is formed at the end of the rod 5 corresponding to the injection hole 31. The first passage hole 531 extends into the rod 5 longer than the length of the piston 6. The first channel hole 531 is in communication with the second channel hole 532 communicated with the O-ring groove 54 formed on the outer peripheral surface of the rod (5).

The O-ring groove 54 has a curved cross section and is a groove into which the O-ring 55 is inserted. The o-ring 55 is seated in the o-ring groove 54 by elasticity.

At least one second channel groove 532 communicating with the bottom of the O-ring groove 54 is formed. The inner diameter of the second flow path groove 532 is smaller than the diameter of the O ring 55 mounted in the O ring groove 54. Therefore, when the O-ring 55 is mounted in the O-ring groove 54, the O-ring 55 blocks the second flow path groove 532. That is, the O-ring 55 interrupts the outlet of the first flow path 53.

In this case, when the working gas is injected into the injection hole 31 at high pressure from the outside, the working gas passes through the injection hole and the first flow path 53, that is, the first flow path 531 and the second flow path 532. To reach the O-ring groove 54. The pressure of the working gas overcomes the elastic force of the O-ring 55, and elastically deforms the O-ring 55 in its radial direction (see partial enlargement of FIG. 5). As a result, the second channel hole 532 at the bottom of the O-ring groove 54 is opened, and the working gas fills the storage space 41 or the storage space 41 and the installation space 11.

When the injection of the working gas is finished, the pressure inside the first passage 53 is lowered, and the O-ring 55 is seated in the O-ring groove 54 by the restoring force. In addition, since the high-pressure working gas filling the interior of the piston 6 and the first closing part 2 presses the O-ring 55 further, the first passage 53 is blocked by the O-ring 55.

6 is a cross-sectional view of the tension gas spring according to the second embodiment of the present invention. The tension gas spring according to the second embodiment of the present invention includes a body 1, a first closing part 2, two closing parts 3, a tube 4, a rod 5 and a piston 6 do. Except as described below, since it has the same configuration and operation as the above-described first embodiment, duplicated description will be omitted.

In the second embodiment of the present invention, a second flow path 56 through which the working gas is injected from the outside is formed in the interior of the rod 5 penetrating the first closing portion 2 and exposed to the outside of the body 1. do. This second flow path 56 enables the injection of the working gas at the exposed end of the rod located in the opposite direction to the end to which the piston 6 is coupled. This second flow path 56 is the main one when the length of the rod 5 is short.

The second flow path 56 communicates with the O-ring groove 54 recessed along the outer circumferential surface of the rod 5, and the O-ring groove 54 is equipped with an O-ring 55 for controlling the second flow path 56. At this time, the operating relationship between the O-ring and the O-ring groove according to the injection of the working gas is the same as the first embodiment described above.

The second embodiment of the present invention does not have to form a flow path at one end of the rod to which the piston is coupled, and can prevent the degradation of the rigidity at one end of the rod to which the piston is connected.

On the other hand, the injection method of the operating gas according to an embodiment of the present invention is spaced apart from the first finishing portion and the second closing portion, each end is hermetically coupled to the first closing portion and the second finishing portion, In the tension gas spring includes a tube having a storage space, a rod extending through the first closing portion to the storage space, and a piston coupled to the rod and in contact with the inner circumferential surface of the storage space and slidable. It is applicable.

In order to inject the working gas into the storage space formed between the outer circumferential surface of the rod and the tube, a high pressure working gas is used as a flow path (first flow path or second flow path described above) formed inside the rod. At this time, the flow path is in communication with the O-ring groove is coupled to the O-ring. The high pressure working gas injected through the flow path elastically deforms to expand the diameter of the O-ring and fills the storage space or the storage space and the installation space.

After the injection of the working gas is completed, the elastically deformed O-ring is restored and seated in the O-ring groove, thereby preventing the leakage of the working gas filling the storage space.

The injection of the working gas through the O-ring and the O-ring groove results in a simple structure and a reduction in manufacturing cost. In addition, since the pressure of the working gas is more pressing the O-ring to the O-ring groove, the larger the pressure of the working gas is to increase the airtight effect.

On the other hand, Figures 7 to 10 are views related to the tension gas spring according to the third embodiment of the present invention.

The tension gas spring 10 according to the third embodiment of the present invention has a body 1 having an installation space 11 formed therein, and a first finishing part 2 having each end of the body 1 coupled thereto. And a second finishing part 3 and the installation space 11, each end of which is hermetically coupled to the first finishing part 2 and the second finishing part 3, and has a storage space therein. 41 is formed, the tube 4 through which at least one communication hole 42 penetrates at one end connected to the first closing part 2, and passes through the first closing part 2. A rod 5 extending into the storage space 41, a piston 6 coupled to an end of the rod 5, the outer circumferential surface of which is in contact with the inner circumferential surface of the storage space 41, and the first finish part. Filled in the space between (2) and the rod (5) and the space between the tube (4) and the body (1) to pressurize the piston (6) towards the second closing portion (3) The.

Here, the body 1, the first closing part 2, the second closing part 3, the tube 4, the rod 5, the piston 6 and the working gas do not conflict with the contents described below. To the extent it may have the features of the first or second embodiment described above.

According to the third embodiment, the space filled by the working gas is not only a space surrounding the circumference of the rod 5, but also a tube 4 and a communication hole 42 formed at one end connected to the first closing part 2. It is also filled in the installation space 11 between the body (1). At this time, at least one communication hole is formed, in order to control the attenuation performance exerted when the rod is pulled, one or a plurality may be formed, and its diameter may vary.

The communication hole 42 allows the space between the tube 4 and the body 1 to form a piston, a rod, a tube, and a first closing portion in the first or second embodiment described above, and the working gas is filled. Is in communication with space.

Since the volume of the working gas pressurized by the piston 6 is increased by the installation space 11 between the tube 4 and the body 1 as the rod 5 is pulled out, the rod 5 is the first finishing part. Even if the tension is maximized up to (2), the working gas can move to the installation space between the body 1 and the tube 4, thereby exhibiting a relatively uniform damping performance in the entire tension section.

In particular, in order to increase the damping performance, when the pressure of the working gas is high, the volume capable of accommodating the working gas is increased so that the damping performance can be relatively uniform for the entire tension section of the rod.

In an additional configuration, the cross-sectional area of the passageway through which the working gas moves between the body 1 and the tube 4 when the rod 5 is tensioned and the working gas of the installation space recovered when the rod 5 is returned are stored. It is further provided with a configuration for changing the cross-sectional area of the passage to move to the space.

Specifically, there is an auxiliary space 32 formed by separating the inner circumferential surface of the body 1 and a part of the outer circumferential surface of the first finishing part 2. The auxiliary space 32 is in communication with the installation space 11. The installation groove 33 is recessed along the circumference of the outer circumferential surface of the first finishing portion 2 forming the auxiliary space 32. At the bottom of the installation groove 33, a gas hole 34 connected to the storage space 41 of the tube 4 is formed. Thus, the storage space 41 communicates with the auxiliary space 32 by the gas hole 34 and the installation groove 33, and also communicates with the installation space 11 between the body 1 and the tube 4. .

In addition, an O-ring R for controlling the gas hole 34 is inserted into the installation groove 33. The O-ring (R) is made of an elastic material such as silicone rubber and is in close contact with the bottom of the installation groove 33 by elasticity in normal times, thereby maintaining a state of blocking the gas hole 34.

When the working gas of the storage space 41 moves to the installation space 11 by being pushed by the piston while the rod 5 is withdrawn, as shown in FIG. 9, some of the working gas passes through the communication hole 42. The remaining working gas pushes the O-ring R installed in the installation groove 33 to open the gas hole 34 and move to the installation space 11 through the gas hole 34.

In particular, when the withdrawal of the rod is abruptly, the internal pressure of the storage space 41 is greatly increased compared to the installation space 11, and when the pressure difference is larger than the elastic force of the O-ring R, the O-ring R is elastic. It is deformed and pushed out of the installation groove 33 to open the gas hole 34. Through the open gas hole and communication hole, the pressure difference between the storage space and the installation space is rapidly lowered to achieve a certain attenuation performance.

On the other hand, while the tension applied to the rod 5 is released and the rod 5 returns to its original position, as shown in FIG. 8, the O-ring R is restored to block the gas hole 34. The rod 5 is restored by the working gas entering the storage space 41 through the communication hole 42 only.

In this case, since the working gas enters the communication hole having a limited inner diameter, the rod is restored at a lower speed than when the gas is opened to the gas hole. As a result, collision between the piston coupled to the end of the rod to be restored and the second closing portion can be reduced, and damage to the piston due to the collision can be reduced.

7 and 10, a third flow path and a fourth flow path for injection of the working gas are shown.

A third flow passage 37 through which the working gas can be injected from the outside is formed in the rod 5 penetrating the first closing portion 2. This third passage 37 is open toward the exposed end of the rod 5 which is open in the body 1 as in the second passage of the embodiment described above. The third flow passage 37 extends to the other end of the rod 5 facing the second closing portion 3. The other end of the rod 5 is recessed and connected to the mounting space 571. The mounting space 571 may vary in internal diameter in multiple stages.

The open mounting space 571 is closed by a piston 6 coupled to the other end of the rod 5. At this time, the piston 6 may be screwed to the stepped portion formed on the outer peripheral surface of the rod (5).

The piston 6 is further provided with a recessed space 65 in communication with the mounting space 571. In addition, the recessed space 65 is in communication with the hole penetrated toward the storage space 41. The third passage 37 is completed by a hole in the longitudinal direction of the rod 5 and a hole formed in the piston 6 via the mounting space 571 and the recessed space 65.

The mounting space 571 is provided with a valve structure 58 for controlling the third flow passage 37. The valve structure can openly close the third flow path.

In a specific embodiment, the valve structure 58 is the mounting space so as to surround the finishing member 581 and the finishing member 581 facing the third passage 37 exposed to the mounting space 571. An elastic member disposed between the cover member 582 and the cover member 582 and the finishing member 581 to press the finishing member 581 toward the third flow path 37. 583).

The finishing member 581 may span the stepped inner surface of the mounting space 571, and a part of the finishing member 581 may be inserted into and block the third passage (exactly a hole) passing through the rod 5. The shape of the finishing member 581 can be variously changed.

The cover member 582 is fixed to the mounting space 571 so as to surround the finishing member 581, and a hole is formed to allow the working gas to pass therethrough. The cover member 582 may be fixed in position by screwing with an inner surface of the mounting space 571. The cover member 582 is spaced apart from the finishing member 581, thereby providing a space in which the finishing member 581 moves to open the third flow path 37.

The elastic member 583 is interposed between the cover member 582 and the finishing member 581 so as to elastically press the finishing member 581 to block the third flow path 37. In more detail, the elastic member 583 may be a spring.

At this time, the cover member can be omitted if one end of the elastic member for pressing the closing member is supported by the piston. However, if the valve structure is provided as a module, it is preferable that a cover member is provided for operational reliability and convenience of assembly of the finishing member.

After the assembly of the tension gas spring is completed, the working gas may be injected through the third passage 37 at the exposed end of the rod 5 exposed to the outside from the body 1. When the injection nozzle (not shown) is connected to the exposed end of the rod and the high-pressure operating gas is supplied, the closing member 581 is pushed to open the third flow path 37 to overcome the elastic force of the elastic member. Therefore, the supplied working gas fills the storage space 41 and the installation space 11 through the mounting space 571 and the recessed space 65.

When the injection of the working gas is finished, the finishing member 581 closes the third flow path 37 by the restoring force of the elastic member 583 and the pressure of the working gas filling the inside.

After the injection of these actuators is completed, the attenuation performance is measured by testing. If the damping performance is unsatisfactory for some reason, by pushing the wire to the third channel of the exposed end and pressing the finishing member 581, the third channel 37 can be opened and the working gas can be removed. This makes it possible to adjust the working gas pressure of the tension gas spring even after the injection of the working gas is finished.

The connection member 7 is further coupled to the exposed end of the rod 5 exposed to the outside of the body 1 for finishing. The third passage 37 has an inner diameter increased at the exposed end and a screw hole is formed therein. The connecting member 7 is screwed into this screw hole. In addition, an O-ring R1 is interposed between the connecting member and the third flow path. Through the double sealing structure of the screw and O-ring, it is possible to more reliably prevent the leakage of the working gas.

On the other hand, in an additional configuration, the injection of the working gas can be made in the direction in which the second closing part 3 is provided. To this end, the second closing portion 3 is formed with an injection hole 31 to which the working gas is supplied to the outside. In addition, a fourth flow path 64 is formed in the piston to allow the working gas injected through the injection hole 31 to move into the space between the rod 5 and the tube 4. The shape of this flow path is similar to the first flow path of the above-described embodiment.

In addition, an opening and closing groove 641 is formed along the circumference of the outer circumferential surface of the piston 6. The bottom of the opening and closing groove 641 communicates with the outlet of the fourth flow path 64. The opening and closing groove 641 is equipped with an O-ring (R2) for regulating the outlet of the fourth flow path (64).

The operating gas injected through the injection hole 31 of the second closing part 3 is moved along the fourth flow path 64 formed in the piston 6, and then the O-ring R2 provided in the opening / closing groove 641. It will pop up and fill the storage and installation space.

After that, when the injection of the working gas is finished, the O-ring R2 is restored to close the fourth flow path 64. In addition, since the O-ring R2 strongly blocks the outlet of the fourth flow path by the pressure of the working gas, leakage of the working gas is prevented.

On the other hand, the fourth flow path 64 in the interior of the piston 6 is formed stepped, the inner surface is composed of a screw hole formed with a thread. The screw hole for airtightness is screwed into this screw hole. In addition, an O-ring R3 is interposed between the screw S and the screw hole to more effectively prevent the leakage of the working gas. By the double hermetic structure of the screw (S) and the O-ring (R3) the leakage of the working gas is more reliably prevented.

In addition, the airtightness of the flow path by the screw and the O-ring is equally applicable to the first flow path or the second flow path of the above-described embodiments.

On the other hand, Figure 11 shows a tension gas spring according to a fourth embodiment of the present invention. The tension gas spring according to the fourth embodiment of the present invention includes a body, a first closing portion, a second closing portion, a tube, a rod, a piston, and an operating gas. These components are the same as the above-described third embodiment except for the contents described below, and the repeated description will be omitted.

The fourth embodiment has a form in which the fourth channel is omitted as compared with the third embodiment. Accordingly, the injection of the working gas through the third passage 37 and the pressure of the working gas filled in the storage space 41 and the installation space 11 are controlled. This fourth embodiment is a major case when the extension length of the rod 5 is short and the length of the hole penetrating the rod is not long.

10: gas spring
1: body 11: installation space
Reference Signs List 2: first closing portion 21: body 22: first coupling portion 23: second coupling portion
24: sliding holes 241, 242: seal
3: second finishing part 31: injection hole 32: auxiliary space 33: mounting groove 34: gas hole
4: tube 41: storage space 42: communication hole
Reference Signs List 5: rod 51: cylindrical rod 52: protrusion 53: first euro
531: first euro hole 532: second euro hole 54: O-ring groove
55: O-ring 56: second euro 571: mounting space
58 valve structure 581 finish member 582 cover member 583 elastic member
6: piston
61: coupling hole 62: extension hole 63: sealing coupling groove 64: fourth euro
641: opening and closing groove 65: recessed space
7: connecting member 71: mounting portion 711: internal flow path
72: hinge piece 721: hinge ball
H: Mounting groove S: Screw R: O-ring

Claims (14)

A tube with a storage space inside,
First and second finishing parts connected to both ends of the tube,
A rod extending through the first finishing part to the storage space,
A piston coupled to the rod and slidable in the storage space, and
Actuated gas filled between the tube and the rod
Lt; / RTI >
The second closing portion is formed with an injection hole for supplying the operating gas from the outside, the rod is formed with a first flow path for introducing the operating gas injected through the injection hole into the space between the tube and the rod The discharge port of the first flow passage is provided with an O-ring for controlling the discharge port of the first flow passage.
Tension gas spring. A tube with a storage space inside,
First and second finishing parts connected to both ends of the tube,
A rod extending through the first finishing part to the storage space,
A piston coupled to the rod and slidable in the storage space, and
Actuated gas filled between the tube and the rod
Lt; / RTI >
A second flow path through which the operating gas can be injected is formed inside the rod passing through the first finishing part.
The second channel is connected to an O-ring mounted along the outer circumferential surface of the rod, and the O-ring intercepts the second channel.
Tension gas spring. 3. The method according to claim 1 or 2,
Further comprising a body having an installation space therein, wherein the tube is disposed in the installation space, the first and second finishing parts are connected to both ends of the body and at the same time are connected to both sides of the body Tension gas spring. Body that is formed inside the installation space,
A first finishing part and a second finishing part connected to both ends of the body,
Located in the installation space, both ends of the tube is connected to the first and second finishing portion, the storage space is formed therein,
A rod extending through the first finishing part to the storage space,
A piston coupled to the rod and slidable in the storage space, and
Actuated gas filled between the tube and the rod
Including;
The first finishing part includes a body, a first coupling part protruding from the body and inserted into an end of the body, and a second coupling part protruding from the first coupling part and inserted into an end of the tube.
Tension gas spring. Body that is formed inside the installation space,
A first finishing part and a second finishing part coupled to both ends of the body,
Located in the installation space, both ends of the tube is connected to the first and second finishing portion, the storage space is formed therein,
A rod extending through the first finishing part to the storage space,
A piston coupled to the rod and slidable in the storage space, and
Actuated gas filled between the tube and the rod
Including;
Each of the end of the rod protruding from the body and the second closing portion is provided with a mounting groove to which the connecting member is detachably coupled.
The connecting member includes a mounting portion coupled to the mounting groove and a hinge piece extending from the mounting portion and having a hinge hole formed therein.
Tension gas spring. The method according to any one of claims 1, 2, 4 and 5,
The rod includes a cylindrical rod body and a protrusion extending from the end of the cylindrical rod body with a smaller diameter and having a thread formed on an outer circumferential surface thereof.
The piston has a coupling hole for screwing into the protrusion and an extension hole extending from the coupling hole to surround a portion of the cylindrical rod body, and at least one sealing coupling groove in contact with the inner circumferential surface of the tube is formed on the outer circumferential surface of the piston. Tension gas springs formed along the circumferential direction. The method of claim 6,
O-ring is further described between the extension hole and the cylindrical rod,
Tension gas spring is formed on the outer circumferential surface of the cylindrical rod body is provided in the circumferential direction mounting groove for mounting the O-ring. Body that is formed inside the installation space,
A first finishing part and a second finishing part connected to both ends of the body,
Located in the installation space, both ends are connected to the first and second finishing portion, the storage space is formed inside, the tube through which at least one communication hole penetrates,
A rod extending through the first finishing part to the storage space,
A piston coupled to the rod and slidable in the storage space, and
Actuating gas filled in the space between the tube and the rod and the space between the tube and the body
Tension gas spring comprising a. 9. The method of claim 8,
The auxiliary space formed by separating the inner circumferential surface of the body and a part of the outer circumferential surface of the first finishing part is in communication with the installation space, and an installation groove is formed along the circumference of the outer circumferential surface of the second finishing part forming the auxiliary space. It is,
The installation groove is formed with a gas hole is connected to the storage space of the tube, the installation groove is a tension gas spring is inserted into the O-ring to control the gas hole. 9. The method of claim 8,
A third passage through which the operating gas is injected from the outside is formed in the rod passing through the first closing portion, and one end of the rod is further provided with a valve structure for controlling the third passage. For gas springs. 11. The method of claim 10,
The valve structure is formed by recessing one end of the rod toward the second closing portion and is installed in a mounting space in communication with the third flow path,
A finishing member facing the third passage exposed to the mounting space;
A cover member installed in the mounting space to surround the finishing member;
An elastic member interposed between the cover member and the finishing member to press the finishing member toward the third flow path
Containing
Tension gas spring. 9. The method of claim 8,
The second closing portion is formed with an injection hole for supplying the working gas from the outside,
The piston has a fourth flow path through which the operating gas injected through the injection hole can move between the rod and the tube,
A gas spring for tension, wherein an outlet of the fourth channel is provided with an O-ring to control the outlet of the fourth channel. The method of claim 12,
The inside of the piston is formed with a screw hole constituting the fourth flow path, the screw is screwed to the screw hole, characterized in that the O-ring interposed between the screw and the screw hole to prevent the leakage of the working gas Tension gas spring. The first and second finishing parts spaced apart from each other, the ends of which are hermetically coupled to the first and second finishing parts and have a storage space formed therein, and through the first finishing part. In the method of injecting a working gas of the tension gas spring comprising a rod extending to the storage space and a piston coupled to the rod and slidable in the storage space,
O-ring grooves in which an O-ring is coupled are recessed on an outer circumferential surface of the rod between the first finishing portion and the piston,
The working gas injected into the rod is introduced into the bottom of the O-ring groove and elastically deforms the O-ring in the radial direction and is injected into the storage space.
And after the injection of the working gas is completed, the O-ring is restored and seated in the O-ring groove to prevent leakage of the working gas.

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