KR200231752Y1 - piston for gas spring - Google Patents

Abstract

The present invention relates to a piston for a gas spring, and more particularly, a flow path through which oil can flow in the piston is formed at the left and right sides of the piston and penetrated at the center thereof so that the oil is discharged through the long flow path to provide a damping effect. It relates to a technique for improving, for this purpose, in the present invention, the central passage 400 is formed in the axial direction at equal intervals in the central portion in which the piston rod 210 is inserted; A plurality of inlets 510 recessed at equal intervals radially with respect to the plane of one side surface of the central channel 400 is formed and the fluid is introduced into the fluid flows into the plurality of inlets 510 in one flow path A small flow path surface 500 which is coupled to and flows in connection with the central flow path 400 through a continuous flow path formed in a circumferential direction; A groove having a predetermined depth is continuously formed on the opposite side of the small flow path surface 500 such that the fluid passing through the central flow path 400 flows through one flow path and flows along the continuously formed long flow path surface. A flow path surface 600 through which the fluid is discharged through the one outlet 610 formed at the outermost portion; Two side plates which are installed in close contact with the small flow path surface 500 and the large flow path surface 600, respectively, and allow the fluid to flow without leakage along the flow path formed on the small flow path surface 500 and the large flow path surface 600 ( 700); which was a problem in the prior art that was used to form an orifice hole through which oil can flow in the piston as a piston for a gas spring to obtain a large damping effect by allowing fluid to flow along a long flow path. There is no clogging of the orifice holes, and there is an advantage that a large damping effect can be obtained at a low flow rate.

Description

Piston for gas spring

The present invention relates to a piston of a gas spring that is widely used in automobiles, aircraft, etc., to form a curved flow path in the piston to improve the damping effect when the piston is extended so that a high damping effect can be obtained at a low flow rate. It relates to the flow path structure of the piston.

In order to obtain a damping effect so that a shock can be absorbed when the piston is extended, the prior art forms a through hole in the piston to allow fluid to flow through the through hole so that damping can occur.

Hereinafter, a piston structure according to the related art as described above will be described. 1 is a plan view of a piston structure according to the prior art, Figure 2 shows a cross-sectional view of the piston according to the prior art.

As shown in the drawing, the piston for gas spring according to the prior art forms a through hole 10 in the body of the piston to allow fluid to flow so that damping occurs when the spring is extended, and at the same time, the speed is controlled. .

When using the gas spring piston according to the prior art as described above, when the fluid passes through the through-hole 10, the through-hole 10 is blocked because of foreign matters deposited, such that the smooth operation is not made. There was also a problem that the damping and speed control in the section where only gas passes without oil and oil are not made.

Therefore, the present invention devised to solve the above problems, by forming a plurality of inlets through which the fluid flows and by forming a long long flow path on both sides of the piston, even if one of the inlets is blocked at any time smoothly through the other inlet. It is an object of the present invention to provide a piston for a gas spring which allows a fluid to flow and at the same time obtains a high damping efficiency by a long flow path.

Another object of the present invention is to provide a piston for a gas spring, by which the piston is manufactured by a mold, thereby eliminating machining, thereby allowing mass production, and thus achieving cost reduction.

1-a plan view of a piston structure according to the prior art;

2-a cross sectional view of a piston according to the prior art;

3-a cross-sectional view of a piston according to an embodiment of the present invention.

Figure 4-Shape of the large flow path surface of the piston according to an embodiment of the present invention.

5-a shape diagram of a small flow path surface of a piston according to an embodiment of the present invention.

6 is a cross-sectional state diagram in which a piston for a gas spring according to an embodiment of the present invention is combined with another component element and compressed;

7 to 6 are state diagrams in which the gas spring is extended.

8-7 is a state diagram when it is compressed again after being expanded in the state of FIG.

<Description of Major Symbols Used in Drawings>

100 tube 150 bend

200: piston body 210: piston rod

220: road guide 250: o-ring

300: oil seal 350: seal stopper

400: Central Euro 500: Small Euro

600: large flow path 700: side plate

800: piston side chamber 900: rod side chamber

The present invention for achieving the above object, and the central passage in which the groove is formed in the axial direction at equal intervals in the central portion where the piston rod is inserted; A plurality of inlets are formed in the radially equidistant intervals on the plane of one side of the central flow path is introduced into the fluid and the fluid flowing into the plurality of inlets are combined in one flow path to form a continuous flow path formed in the circumferential direction A small flow path surface which is connected to the central flow path and flows through the flow path; A groove having a predetermined depth is continuously formed on the opposite side of the small flow path surface so that the fluid passing through the central flow path is configured to flow through one flow path and flows along the continuously formed long flow path surface to form the outermost one. A passage surface through which the fluid is discharged through an outlet of the passage; Two side plates which are installed in close contact with each of the small flow path surface and the large flow path surface and allow the fluid to flow without leakage along the flow paths formed on the small flow path surface and the large flow path surface. In order to achieve a large damping effect, a piston for a gas spring is a technical subject.

On the other hand, the maximum outer diameter portion of the piston is formed such that the same four recessed depressions are formed in four equal positions to form a structure that allows fluid to flow through the depression when the piston is compressed.

And the piston for a gas spring according to the present invention is a tube 100, a piston rod 210, a rod guide 220, an o-ring (250), the oil chamber 300 which is a component of a conventional gas spring And a seal stopper 350 or the like are used.

Hereinafter, with reference to the accompanying drawings will be described in more detail with respect to the piston for the gas spring according to the present invention, Figure 3 shows a cross-sectional view of the piston according to an embodiment of the present invention, Figure 4 is an embodiment of the present invention The shape of the large flow path surface of the piston according to the example, Figure 5 shows the shape of the small flow path surface of the piston according to an embodiment of the present invention.

As shown in FIG. 3, the present invention has a large flow path surface 500 and a large flow path surface in which a large flow path is formed on both sides and a central flow path 400 formed in a central portion of the piston 200 and the piston 200. 600) and the side plate 700 is installed in close contact with the small flow path surface 500 and the large flow path surface 600.

Each side plate 700 in close contact with the small flow path surface 500 and the large flow path surface 600 is completely in close contact with the piston 200 when the piston 200 is coupled to the piston rod 210. The fluid flows into and out of the inlet 510 or the outlet 610 only.

Hereinafter, each part of the gas spring piston according to an embodiment of the present invention will be described in more detail.

First, the piston 200 has a central portion penetrated through the inner surface thereof, and a straight groove formed in the axial direction at equal intervals is formed to form a central flow path 400. In addition, the outer surface of the piston 200 is reduced in diameter at right angles to form a stage, and a large flow path surface 600 is formed on the side of the larger diameter, and a small flow path surface 500 is formed on the small diameter surface. do. On the other hand, on the outer circumferential surface of the passage surface 600, the same recessed grooves 205 recessed in four equal positions are formed in four places.

The small flow path surface 500 is formed with an intaglio recessed inward with respect to the plane, the flow path is formed in the outermost portion of the small flow path surface 500 is formed with a plurality of radially equally spaced inlet 510 and the The plurality of inlets 510 are combined by flow passages formed in a circumferential manner to move to the next flow passage through one flow passage, and finally follow the central flow passage 400.

Next, the large flow path surface 600 formed on the opposite side of the small flow path surface 500 will be described. The large flow path surface 600 is formed at one end of the central flow path 400 so that a semicircular flow path is repeatedly formed on one side, and the flow path is the deepest side on the opposite side in the outermost part. Subsequently, forming a semicircular shape again, the flow path is led to the outer shell portion, thereby forming a structure in which one outlet 610 is formed at the outermost portion.

The shape of the flow path formed on the large flow path surface 600 or the small flow path surface 500 is not limited to an embodiment of the present invention, and is formed by bending on the large flow path surface 600 or the small flow path surface 500. Note that the flow paths of various shapes are included.

Next, each side plate 700 is installed in close contact with the large flow path surface 600 and the small flow path surface 500 of the piston, and a through hole having the same diameter as the piston rod 210 is formed at the center portion of the piston 200. And a piston rod 210. And the thickness of the side plate 700 is to be configured to withstand the flow of the fluid without deformation as it is in close contact with the piston 200.

With reference to Figures 3 to 5 will be described for the flow of fluid in the gas spring piston according to an embodiment of the present invention.

When the piston 200 is extended, the fluid located on the small flow path surface 500 flows through a plurality of inlets 510 formed on the small flow path surface 500, and the introduced fluid flows through the one flow path. It flows through the curved flow path formed in the small flow path surface 500 to reach the central flow path 400, and moves toward the large flow path surface 600 reaching the central flow path 400. The fluid reaching the inlet of the large flow path surface 600 is moved along the curved flow path to the piston side chamber 800 through the outlet 610 formed at the outermost part of the large flow path surface 600.

When the gas spring is extended in the above-described process, the fluid is moved through the long flow path so that a damping action occurs gradually.

Next, a gas spring piston according to an embodiment of the present invention will be described with respect to the flow of the fluid by the piston as it is combined with other component elements stretched or compressed.

Figure 6 shows a cross-sectional state when the piston for the gas spring according to an embodiment of the present invention is fully compressed in combination with other component elements. As shown, gas and oil are injected into the tube 100, and are divided into the piston side chamber 800 and the rod side chamber 900 by the piston 200, and the piston 200 is moved left and right. Fluid exchange occurs between the piston side chamber 800 and the rod side chamber 900 through the piston 200.

One end of the tube 100 is hermetically sealed and the other end of the tube 100 is closed to the outside and the inside of the tube 100 by an oil seal 300.

Meanwhile, FIG. 7 illustrates a state in which the gas spring is extended in the state of FIG. 6, and the o-ring 250 installed in the piston 200 is moved to the right side so that the fluid flows out to an area other than the flow path of the piston. Therefore, the fluid is moved along the flow path through the plurality of inlets 510 of the small flow path surface 500 of the piston for gas spring according to the present invention, and then moved back to the central flow path 400. The fluid is moved to the piston-side chamber 800 through the outlet 610 along the flow path formed in the flow path surface 600. In the above process, the fluid is moved from the rod side chamber 900 to the piston side chamber 800 by damping to prevent sudden expansion of the piston and to control the speed at which the fluid is expanded.

On the other hand, Figure 8 shows the flow of the fluid when the gas spring is extended in the process of Figure 7 is compressed again, during compression, the O-ring (250) installed on the piston 200 is left The fluid moved to the piston-side chamber 800 is to be quickly moved to the rod-side chamber 900 through the recessed groove 205 formed on the outer circumferential surface of the piston 200.

As described above, the piston for a gas spring according to the present invention can obtain a large damping effect even with a small amount of fluid by a long flow path.

In addition, a plurality of inlets are formed on the surface of the small flow path, and even though one of the inlets is blocked by a foreign material, the fluid can flow through the other inlets, thereby providing a gas spring piston that can operate more stably and reliably. There is.

Claims (1)

In the piston 200 used for the gas spring, A central flow passage 400 in which grooves are formed in the axial direction at equal intervals at the central portion into which the piston rod 210 is inserted; A plurality of inlets 510 recessed at equal intervals radially with respect to the plane of one side surface of the central channel 400 is formed and the fluid is introduced into the fluid flows into the plurality of inlets 510 in one flow path A small flow path surface 500 which is coupled to and flows in connection with the central flow path 400 through a continuous flow path formed in a circumferential direction; A groove having a predetermined depth is continuously formed on the opposite side of the small flow path surface 500 such that the fluid passing through the central flow path 400 flows through one flow path and flows along the continuously formed long flow path surface. A flow path surface 600 through which the fluid is discharged through the one outlet 610 formed at the outermost portion; Two side plates which are installed in close contact with the small flow path surface 500 and the large flow path surface 600, respectively, and allow the fluid to flow without leakage along the flow path formed on the small flow path surface 500 and the large flow path surface 600 ( And a piston for a gas spring configured to obtain a great damping effect by allowing fluid to flow along a long flow path.