KR20210075956A - Sealing member of hydraulic cylinder and method for combine them - Google Patents

Abstract

The present invention relates to a sealing member for a cylinder having a stepped protrusion portion in the upper part, which can be installed between the wall portions located in the outward direction of the cylinder. The sealing member of the present invention comprises: a first sealing unit interposed between the stepped protrusion portion and the wall portion to keep airtight; a cover unit disposed above the stepped protrusion portion to compress the first sealing unit downward by coming in contact with the stepped protrusion portion; and a second sealing unit interposed between the first sealing unit and the cover unit to compress the first sealing unit along with the downward compression of the cover unit, thereby keeping the cylinder airtight. In accordance with the present invention, loss of a fluid in the cylinder can be prevented to avoid damage to a piston caused by a leaking fluid, an accident such as explosion of the cylinder, and the like. In addition, coupling of the cover unit and the stepped protrusion portion allows the downward compression of the cover unit to keep the inner side of the cylinder airtight, thereby eliminating the inconvenience of having to install a separate sealing means in the inner circumferential surface of the cylinder.

Description

Sealing member and coupling method for hydraulic cylinders {SEALING MEMBER OF HYDRAULIC CYLINDER AND METHOD FOR COMBINE THEM}

The present invention relates to a sealing member for a hydraulic cylinder and a coupling method. In more detail, it relates to a sealing member and a coupling method of the sealing member for maintaining a tighter airtightness in the process of reciprocating the hydraulic cylinder in the vertical direction.

In general, a cylinder is configured to transmit power or open and close a valve by performing a reciprocating motion using a hydraulic pressure of a fluid composed of liquid or gas. In particular, since power can be supplied directly to equipment requiring power through the reciprocating motion of the cylinder and power can be supplied by simply performing the reciprocating motion, the hydraulic cylinder is closely adopted and used throughout various industries.

Since the hydraulic cylinder as described above should not lose fluid in the process of performing a reciprocating motion for a long time, it is provided with an airtight maintenance means between the cylinder and the piston as in Cited Document 1 (Republic of Korea Patent No. 10-1322497). Maintain internal confidentiality. However, in the case of Citation 1, there is a problem in that the airtight maintenance means is worn during the reciprocating motion of the piston for a long time, so that the airtight maintenance is not performed properly. In addition, the above-described airtight maintaining means has a problem in that it is difficult to maintain solid airtightness because the shape is deformed toward the outer direction with respect to the central axis of the piston by a friction force generated when the piston reciprocates at a high speed. Additionally, in the case of Citation 1, if you want to replace the air tightness means, you need to dissect the cylinder itself and take out the piston to the outside of the cylinder and then perform repair work such as replacement, which causes the advancement of the repair work and the time the cylinder stops This increase is a major cause of lowering work efficiency. Accordingly, there is a need to develop a sealing member for a hydraulic cylinder that minimizes wear, enables solid airtight maintenance even in a high-speed reciprocating motion of the cylinder, and can be easily replaced in a short time.

Citation 1: Republic of Korea Patent No. 10-1322497 (Registered on Oct. 21, 2013)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sealing member capable of maintaining a strong airtightness inside a cylinder for a long time.

Another object of the present invention is to provide a sealing member having high durability by minimizing friction with the piston.

Another object of the present invention is to provide a sealing member that is easy to replace.

To this end, the present invention provides a sealing member installed between a cylinder in which a stepped portion is formed in the upper direction and a wall portion located in an outer direction of the cylinder, and is interposed between the stepped portion and the wall portion to maintain airtightness, the first sealing portion, the stepped portion The cover part is located in the upper direction and presses the first sealing part in the downward direction through contact with the stepped part, and the first sealing part is located between the first sealing part and the cover part and pressurizes the first sealing part according to the pressure in the lower direction of the cover part to ensure airtightness. It includes a second sealing portion for holding.

According to the present invention, it is possible to block the loss of the fluid inside the cylinder, and it is possible to prevent accidents such as damage to the piston and explosion of the cylinder due to the fluid flowing out.

In addition, according to the present invention, it is possible to maintain the airtightness inside the cylinder only by pressurizing the cover portion in the downward direction according to the coupling of the cover portion and the stepped portion, thereby reducing the inconvenience of having to install a separate sealing means on the inner circumferential surface of the cylinder.

1 is a cross-sectional perspective view of a sealing member for a hydraulic cylinder according to a first embodiment of the present invention.
2 is a cross-sectional view of a sealing member for a hydraulic cylinder according to a first embodiment of the present invention.
3 is a cross-sectional view showing the arrangement of the first sealing part, the second sealing part, and the third sealing part according to the first embodiment of the present invention.
4 is a cross-sectional view illustrating a first O-ring part and a second O-ring part according to a first embodiment of the present invention.
5 is a cross-sectional view illustrating that the first O-ring part and the second O-ring part are located in the first space part and the second space part according to the first embodiment of the present invention to maintain airtightness.
6 is a cross-sectional view illustrating the arrangement of the first sealing part, the second sealing part, the third sealing part, and the cover part according to the second embodiment of the present invention.
7 is a cross-sectional view illustrating a third O-ring part according to a second embodiment of the present invention.
8 is a view showing a third sealing part and a fourth O-ring part according to a third embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily implement them. However, the present invention may be implemented in several different forms and is not limited to the embodiments disclosed below. In addition, in order to clearly disclose the present invention in the drawings, parts irrelevant to the present invention are omitted, and the same or similar symbols in the drawings indicate the same or similar components.

Objects and effects of the present invention can be naturally understood or made clearer by the following description, and the objects and effects of the present invention are not limited only by the following description.

The objects, features and advantages of the present invention will become more apparent from the following detailed description. In addition, in describing the present invention, when it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings. Prior to describing the present invention in detail, “upward direction” and “downward direction” refer to an upward direction and a downward direction in the drawings, respectively, unless otherwise specified. In addition, "outward direction of the cylinder (c)" refers to a direction toward the outside with the center axis of the cylinder (c) reciprocating in the vertical direction. In addition, "both sides direction" described in the present invention refers to a left direction and a right direction based on the cross-sectional view.

1 is a view of a sealing member for a hydraulic cylinder according to a first embodiment of the present invention as a whole, and a piston (p) and a cylinder (c) to show a sealing member located between the piston (p) and the cylinder (c) is cut and shown.

The piston (p) is configured to supply power through reciprocating motion in the vertical direction or to open and close the inside of the cylinder (c). To this end, the piston (p) is formed in a cylindrical shape and connected to a separate connecting rod formed in the upper or lower direction in a rod shape to receive power from a separate power supply unit and reciprocate in the vertical direction. In addition, a stepped portion (s) is formed in the upper direction of the piston (p). The step portion (s) provides a space for locating a sealing member to be described later. In detail, the step portion (s) is formed in a cylindrical shape and is provided so that the diameter is smaller than the inner diameter of the cylinder (c), and is connected to the upper end of the piston (p) to reciprocate in the vertical direction integrally. Accordingly, a spaced space is formed between the stepped portion (s) and the cylinder (c), and a sealing member to be described later is inserted into the spaced space to maintain airtightness between the piston (p) and the cylinder (c). . Since the piston (p) is a widely known configuration, a more detailed description will be omitted.

The cylinder (c) provides a space so that the piston (p) can easily reciprocate. In detail, the piston (p) is inserted into the cylinder (c) formed in a tubular shape and the upper and lower surfaces are sealed, and the piston (p) performs a reciprocating motion in the vertical direction inside the cylinder (c). In particular, a fluid is inserted into the inside of the hydraulic cylinder (c) as in the present invention, and the fluid moves the piston (p) in the vertical direction. Here, the cylinder (c) should be provided so that the upper and lower surfaces must be sealed and the piston (p) can reciprocate in the vertical direction. In detail, in the process where the fluid inside the cylinder (c) moves the piston (p) in the upward and downward directions, the inner peripheral surface of the cylinder (c) causes friction with the outer peripheral surface of the piston (p), thereby not causing damage such as cracks At the same time, the fluid inside the cylinder (c) should not be lost. However, in order to prevent friction between the cylinder (c) and the piston (p) from occurring, it is necessary to arrange a separation space between the cylinder (c) and the piston (p), which means that the fluid inside the cylinder (c) is It causes a problem of being lost to the outside through the separation space. 1 as an example, when the fluid located in the lower direction of the piston (p) flows in the upper direction of the piston (p) in the process of moving the piston (p) in the upper direction, the efficiency of the piston (p) is There is a problem of degradation. In addition, when the fluid inside the cylinder (c) is a flammable liquid such as oil, it may cause a fire. Accordingly, the present invention discloses a sealing member capable of maintaining airtightness by sealing the space spaced apart between the piston (p) and the cylinder (c).

The sealing member for a hydraulic cylinder according to the present invention is installed between the piston (p) and the cylinder (c) having the stepped portion (s) formed therein, and the first sealing part 100, the second sealing part 200 and the cover part (400).

2 is a cross-sectional view of a sealing member for a hydraulic cylinder according to a first embodiment of the present invention, and FIG. 3 is a first sealing part 100, a second sealing part 200 and a second sealing member according to the first embodiment of the present invention. 3 It is sectional drawing which shows arrangement|positioning of the sealing part 300.

The first sealing part 100 is provided for the purpose of maintaining airtightness. To this end, the first sealing portion 100 is located between the stepped portion (s) and the cylinder (c). In detail, the first sealing portion 100 is interposed between the stepped portion (s) and the cylinder (c), and each of the stepped portion (s) and the cylinder (c) through a pair of contact portions 102 to be described later. Maintain confidentiality by establishing interview contacts. In addition, the lower surface of the first sealing part 100 is provided to be in contact with the upper surface of the piston (p). Accordingly, the first sealing part 100 can maintain the airtight between the piston (p) and the cylinder (c) while positioned within the above-described separation space. In addition, the first sealing part 100 may be provided with a material such as MC nylon. In detail, the first sealing part 100 may be made of an engineering plastic material such as MC nylon having high mechanical strength, self-lubrication and heat resistance. This is to minimize the occurrence of friction in the process of the piston (p) reciprocating in the vertical direction inside the cylinder (c) and to prevent damage in advance. The material of the first sealing part 100 as described above may be equally applied to the second sealing part 200 to be described later. In addition, for more robust airtight maintenance, the first sealing part 100 includes a first opening 101 and a pair of contact parts 102 .

”단면 형상을 갖는다. 즉, “

” 단면 형상을 갖고 단턱부(s)의 외주면을 감싸도록 환 형상으로 형성되는 제1 실링부(100)는 후술할 제2 실링부(200)가 상측 방향에서 제1 개구부(101)로 삽입되고, 상측 방향에는 한 쌍의 접촉부(102)가 형성되어 기밀을 유지하게 된다. 제1 실링부(100)의 기밀 유지에 대한 보다 상세한 설명은 후술하도록 한다.In the first opening 101 , a second sealing part 200 to be described later is inserted and accommodated, thereby pressing the first sealing part 100 to maintain airtightness. In detail, the second protruding pressing part 203 provided in the second sealing part 200 is inserted into the first opening 101 , and the second sealing part 200 is lowered by the cover part 400 to be described later. As it is pressed in the direction, the second protruding pressing part 203 pushes the pair of contact parts 102 in both directions (meaning the left and right directions in FIGS. 2 and 3), and accordingly, the pair of contact parts ( 102) maintains airtightness by making surface contact with the outer peripheral surface of the stepped portion (s) and the inner peripheral surface of the cylinder (c), respectively. To this end, the first opening 101 is provided in the upper direction of the first sealing part 100, and is formed by being engraved in the lower direction. Accordingly, a pair of contact portions 102 are respectively formed in both directions of the first opening 101, and the first sealing portion 100 is

“It has a cross-sectional shape. In other words, "

The first sealing part 100 having a cross-sectional shape and formed in an annular shape to surround the outer circumferential surface of the stepped part (s) is inserted into the first opening 101 from the upper direction, and a second sealing part 200 to be described later is inserted into the first sealing part 100 and , a pair of contact portions 102 are formed in the upper direction to maintain airtightness. A more detailed description of the airtight maintenance of the first sealing part 100 will be described later.

The pair of contact portions 102 are provided in the upper direction of the first sealing portion 100 to perform direct airtight maintenance of the piston (p) and the cylinder (c). In detail, the pair of contact portions 102 respectively contact the outer peripheral surface of the stepped portion (s) and the inner peripheral surface of the cylinder (c) to seal the space between the cylinder (c) and the stepped portion (s), thereby sealing the airtightness. keep To this end, the pair of contact portions 102 are positioned on both sides of the first opening 101 and are inclined at a predetermined angle to face the upper direction. Here, the predetermined angle may be provided at an angle such that the pair of contact portions 102 face upward at 70 to 80 degrees from the ground, but is not limited thereto and may be changed according to a designer's change. For example, when the separation space of the piston (p) and the cylinder (c) is large, a predetermined angle between the pair of contact portions 102 and the ground may be provided to be smaller than the aforementioned 70 to 80 degrees. In detail, when the diameter of the piston (p) and the stepped portion (s) is significantly smaller than the inner diameter of the cylinder (c), the pair of contact portions 102 are directed in the upper-left direction and the upper-right direction (upper-left direction and By being provided to face the upper right direction), it is possible to perform a larger surface contact with the cylinder (c) and the stepped portion (s), so that a firm airtight maintenance is possible.

”단면 형상을 갖는다. 상세하게, 제2 실링부(200)의 하측 방향에는 후술할 제2 돌출 가압부(203)가 형성됨으로써 “T”자 단면 형상을 갖고, 제1 개구부(101)는 제2 돌출 가압부(203)의 형상에 대응하도록 형성된다. 이를 통해, 제2 실링부(200)는 제1 실링부(100)를 향해 보다 많은 면접촉을 이룰 수 있어 작은 힘으로도 한 쌍의 접촉부(102)가 각각 실린더(c)의 내주면 방향 및 단턱부(s)의 외주면 방향으로 향할 수 있도록 할 수 있다. 상기와 같은 제2 실링부(200)의 단면은 “T”자 형상뿐만 아니라, “I”자 형상 등으로 다양하게 구비되어 보다 견고한 기밀 유지를 수행할 수 있다. 일례로, “I”자 단면 형상을 갖는 제2 실링부(200)의 경우 하측 방향을 향해 형성되는 제2 돌출 가압부(203)는 “ㅗ”단면 형상을 갖고, 제1 개구부(101)는 제2 돌출 가압부(203)의 형상에 대응되도록 개구되어 형성된다. 이를 통해, 제2 실링부(200)는 제1 실링부(100)에 삽입되어 배치된 상태에서 피스톤(p)의 왕복 운동 과정에서 이탈되는 것을 미연에 방지할 수 있다. 한편, 제2 실링부(200)의 상면은 후술할 커버부(400)의 하면과 접하고, 커버부(400)의 하측 방향으로의 가압에 따라 제2 실링부(200)는 제1 실링부(100)를 하측 방향으로 가압하며, 이 과정에서 한 쌍의 접촉부(102)는 보다 견고한 기밀을 유지한다.The second sealing part 200 presses the first sealing part 100 in the downward direction to maintain airtightness between the piston (p) and the cylinder (c). In detail, the second sealing portion 200 presses the first sealing portion 100 so that the pair of contact portions 102 have greater surface contact with the inner peripheral surface of the cylinder c and the outer peripheral surface of the stepped portion s, respectively. By doing so, confidentiality is maintained. To this end, the second sealing part 200 is located in the upper direction of the first sealing part 100, but is provided to be positioned between the first sealing part 100 and the cover part 400 to be described later. In addition, the second sealing part 200 is formed in a ring shape and positioned between the stepped part (s) and the cylinder (c), but disposed to be inserted into the above-described first opening 101 . As a more preferred embodiment, the second sealing part 200 is "

“It has a cross-sectional shape. In detail, a second protruding pressing part 203 to be described later is formed in the lower direction of the second sealing part 200 to have a "T" cross-sectional shape, and the first opening 101 has a second protruding pressing part 203 . ) is formed to correspond to the shape of Through this, the second sealing part 200 can make more surface contact toward the first sealing part 100, so that even with a small force, the pair of contact parts 102 can be in the inner circumferential direction and the end of the cylinder (c), respectively. It may be directed toward the outer peripheral surface of the chin portion (s). The cross section of the second sealing part 200 as described above may be variously provided not only in a “T” shape, but also in an “I” shape, so that more robust air tightness can be maintained. For example, in the case of the second sealing part 200 having an “I” cross-sectional shape, the second protruding pressing part 203 formed in the downward direction has a “ㅗ” cross-sectional shape, and the first opening 101 is It is formed to be opened to correspond to the shape of the second protruding pressing part 203 . Through this, it is possible to prevent in advance that the second sealing part 200 is separated from the reciprocating motion of the piston p in a state in which it is inserted into the first sealing part 100 . On the other hand, the upper surface of the second sealing part 200 is in contact with the lower surface of the cover part 400 to be described later, and according to the pressure in the downward direction of the cover part 400, the second sealing part 200 is the first sealing part ( 100) is pressed in the downward direction, and in this process, the pair of contact portions 102 maintains a tighter airtightness.

As an even more preferred embodiment, the second protruding pressing part 203 may be provided to have an inclined surface. In detail, the second protruding pressing part 203 is inclined so as to have a smaller width from the upper direction to the lower direction. In more detail, the second protruding pressing part 203 may be inclined so that the width of the upper end is greater than the width of the lower end. In addition, the sum of the width of the second protruding pressing portion 203 inserted into the first opening 101 in both directions (meaning the left and right directions in FIGS. 2 and 3 ) and the width of the pair of contact portions 102 is It may be provided to be greater than the distance between the inner peripheral surface of the cylinder (c) and the outer peripheral surface of the stepped portion (s). That is, when the second protruding pressing portion 203 is inserted into the first opening 101 , the sum of the widths of the pair of contact portions 102 and the second protruding pressing portion 203 is the distance between the cylinder and the stepped portion. As provided to be larger, the pair of contact portions 102 are pressed toward the inner circumferential direction of the cylinder (c) and the outer circumferential direction of the stepped portion (s), respectively. Through this, a more robust confidentiality effect can be derived.

The cover part 400 is configured to press the second sealing part 200 so that the first sealing part 100 and the second sealing part 200 can firmly maintain airtightness. To this end, the cover portion 400 is formed in a disk shape and is located in the upper direction of the stepped portion (s). Here, the diameter of the cover 400 is provided to be the same as the inner diameter of the cylinder (c), it is possible to achieve a more robust airtight maintenance with respect to the piston (p) and the cylinder (c). In addition, the cover portion 400 is connected to the stepped portion (s) by a separate fastening means. Here, the lower surface of the cover part 400 is in contact with the upper surface of the second sealing part 200 , and at the same time, the cover part 400 presses the second sealing part 200 in a downward direction. In detail, when the cover part 400 is positioned in the upper direction of the stepped part s, the lower surface of the cover part 400 makes surface contact with the upper surface of the second sealing part 200 . Thereafter, the cover part 400 moves downward in the process of being connected to the stepped part s by the fastening means such as a screw, and in this process, the cover part 400 moves the second sealing part 200 to the lower side. pressure in the direction The second sealing part 200 is pressurized in the downward direction by the pressure of the cover part 400 and is changed in shape so as to spread in both directions (meaning the left direction and the right direction in FIG. 3), so that the inner peripheral surface of the cylinder (c) and The outer circumferential surface of the step portion (s) and the surface contact each are made to maintain confidentiality. In addition, the second protruding pressing part 203 located in the lower direction of the second sealing part 200 is inserted into the first opening 101 in the vertical direction by pressing the cover part 400 in the downward direction. A shape deformation occurs in which the length of is decreased and the length in both directions increases. Such a second protruding pressing portion 203 spreads the pair of contact portions 102 located in both directions toward the cylinder direction and the stepped direction, respectively. Accordingly, the pair of contact portions 102 are in greater surface contact with the inner peripheral surface of the cylinder (c) and the outer peripheral surface of the stepped portion (s) to maintain airtightness.

The configuration of the first sealing part 100, the second sealing part 200, the first opening 101, the pair of contact parts 102, the second protruding pressing part 203 and the cover part 400 as described above. Through this, it is possible to more firmly maintain the airtightness, thereby preventing various accidents due to the loss of fluid inside the cylinder (c) in advance. In detail, in the pair of contact portions 102 provided in the first sealing portion 100 , the cover portion 400 coupled to the stepped portion s presses the second sealing portion 200 in the downward direction, and the second sealing portion 200 is 2 The second protruding pressing part 203 provided in the lower direction of the sealing part 200 is inserted into the first opening 101 in the direction of the inner circumferential surface of the cylinder c and the outer circumferential direction of the stepped portion s (Fig. As the shape changes so as to increase the volume in the left direction and the right direction of 3), it is pressed in both directions from the second protruding pressing part 203 so that the inner circumferential surface of the cylinder c and the outer circumferential surface of the piston p each open to face each other. At the same time, the second sealing part 200 positioned between the cover part 400 and the first sealing part 100 and pressed in the downward direction from the cover part 400 moves in both directions (left and right directions in FIG. 3 ). By increasing the volume of the contact portion 102 , it has the same surface contact as the pair of contact portions 102 . Therefore, it is possible to derive a multiple airtight effect between the cylinder (c) and the stepped portion (s). In addition, the contact portion 102, the second sealing portion 200, and the second protruding pressing portion 203 of the first sealing portion 100 according to the present invention has a length in the vertical direction as the pressure inside the cylinder (c) increases. Since it causes a volume change that decreases and the length in the left and right directions increases, the airtightness can be maintained firmly even in a high-pressure environment. Therefore, it can be easily adopted for the hydraulic cylinder (c) that requires a larger hydraulic pressure in order to produce a high output.

4 is a cross-sectional view illustrating a first O-ring part r1 and a second O-ring part r2 according to a first embodiment of the present invention, and FIG. 5 is a first O-ring part r1 according to a first embodiment of the present invention. ) and the second O-ring part (r2) is a cross-sectional view showing that the airtightness is maintained by being located in the first space part 110 and the second space part 120 .

The first O-ring part r1 and the second O-ring part r2 serve to maintain airtightness between the cylinder c and the piston p. In detail, the first O-ring part r1 and the second O-ring part r2 are formed in an annular shape and have a circular cross-section. In addition, the first O-ring part (r1) and the second O-ring part (r2) are respectively between the first sealing part 100 and the cylinder (c) and between the first sealing part 100 and the stepped part (s). Confidentiality is maintained by each location. As a more preferred embodiment, the first sealing part 100 further includes a first space part 110 and a second space part 120 . In addition, the first O-ring part r1 and the second O-ring part r2 may be made of an elastic material. In detail, the first O-ring part r1 and the second O-ring part r2 may be made of a material having a restoring force, such as rubber. This is to prevent the first O-ring part r1 and the second O-ring part r2 from being excessively crushed and damaged in the airtight maintenance process of the first O-ring part r1 and the second O-ring part r2, which will be described later.

”단면 형상을 갖는 제1 실링부(100)의 좌측 방향에 형성되고, 제2 공간부(120)는 제1 실링부(100)의 우측 방향에 형성된다. 보다 상세하게, 제1 공간부(110)는 제1 개구부(101)를 기준으로 실린더(c)의 내주면 방향에 형성되고, 제2 공간부(120)는 제1 개구부(101)를 기준으로 단턱부(s)의 외주면 방향에 형성된다. 즉, 도 5를 참조하면 제1 공간부(110) 및 제2 공간부(120)는 제1 개구부(101)를 기준으로 양측 방향에 형성되되 대칭이도록 형성된다. 이와 같이 제1 실링부(100) 및 실린더(c)의 내주면의 사이에 형성되는 제1 공간부(110)에는 제1 오링부(r1)가 삽입되고, 제1 실링부(100) 및 단턱부(s)의 외주면의 사이에 형성되는 제2 공간부(120)에는 제2 오링부(r2)가 삽입됨으로써, 제1 오링부(r1) 및 제2 오링부(r2)는 제1 공간부(110) 및 제2 공간부(120)의 외부로 이탈하지 않고 기밀을 유지할 수 있다. 특히, 피스톤(p)의 상하 방향으로의 왕복 운동 시, 제1 오링부(r1) 및 제2 오링부(r2)가 실린더(c) 및 단턱부(s)와의 마찰 등에 의해 이탈되는 것을 방지할 수 있다.The first space part 110 and the second space part 120 provide a space for the first O-ring part r1 and the second O-ring part r2 to be disposed. In detail, the first O-ring part r1 and the second O-ring part r2 are respectively inserted into the first space part 110 and the second space part 120 in the downward direction of the cover part 400 . Airtightness is maintained by changing the shape in response to the shape change of the first sealing part 100 by pressing. To this end, the first space part 110 and the second space part 120 are provided in the outer direction and the inner direction of the first sealing part 100 . In detail, the first space portion 110 is “

“It is formed on the left side of the first sealing part 100 having a cross-sectional shape, and the second space part 120 is formed on the right side of the first sealing part 100 . In more detail, the first space portion 110 is formed in the inner circumferential direction of the cylinder c with respect to the first opening 101 , and the second space portion 120 has a step with respect to the first opening 101 . It is formed in the direction of the outer peripheral surface of the chin portion (s). That is, referring to FIG. 5 , the first space portion 110 and the second space portion 120 are formed in both directions with respect to the first opening 101 , but are formed to be symmetrical. As described above, the first O-ring part r1 is inserted into the first space 110 formed between the first sealing part 100 and the inner circumferential surface of the cylinder c, and the first sealing part 100 and the stepped part The second O-ring part r2 is inserted into the second space 120 formed between the outer peripheral surfaces of (s), so that the first O-ring part r1 and the second O-ring part r2 are separated from the first space part ( 110) and the second space 120 can be kept airtight without leaving the outside. In particular, when the piston (p) reciprocates in the vertical direction, the first O-ring part (r1) and the second O-ring part (r2) can be prevented from being separated by friction with the cylinder (c) and the stepped part (s). can

Hereinafter, an airtight maintenance process of the first O-ring part r1 and the second O-ring part r2 will be described. In a state in which the first O-ring part r1 and the second O-ring part r2 are inserted and disposed in the first space part 110 and the second space part 120, respectively, the cover part 400 has a stepped part (s). is screwed with, the second sealing part 200 is pressed in the downward direction by the cover part 400, and the second protruding pressing part 203 located in the downward direction of the second sealing part 200 is a cylinder (c) ) of the inner circumferential direction and the outer circumferential direction of the stepped portion (s), spread a pair of contact portions 102 in both directions (meaning the left and right directions in FIG. 5) to spread the inner circumferential surface and stepped portion of the cylinder (c) ( s) to make an interview contact with the outer periphery. Here, in the first O-ring part r1 and the second O-ring part r2 located in the lower direction of the pair of contact parts 102 , the length of the first sealing part 100 in the vertical direction decreases, and in both directions. As the length increases, the shape changes to be distorted. In detail, a pair of contact portions 102 positioned in the upper direction of the first O-ring part r1 and the second O-ring part r2 move in the direction of the inner circumferential surface of the cylinder c and the outer circumferential surface of the stepped portion s, respectively. In the process, the first O-ring portion r1 and the second O-ring portion r2 located in the lower direction are pressed in the direction of the inner circumferential surface of the cylinder c and the outer circumferential direction of the stepped portion s, respectively. Accordingly, the first O-ring part (r1) and the second O-ring part (r2) are in surface contact with the inner peripheral surface of the cylinder (c) and the outer peripheral surface of the stepped part (s) to maintain airtightness, which is the cylinder (c) And it derives the effect that can significantly increase the airtight maintenance effect between the piston (p).

Additionally, the pair of contact portions 102 through the first O-ring portion r1 and the second O-ring portion r2 may be prevented from being excessively bent or damaged in the airtight maintenance process. In detail, the pair of contact portions 102 positioned in the upper direction of the first O-ring portion r1 and the second O-ring portion r2 are in surface contact with the inner circumferential surface of the cylinder c and the outer circumferential surface of the stepped portion s, respectively. In the process, the high-pressure fluid and the reciprocating piston (p) are excessively moved in the direction of the inner circumferential surface of the cylinder (c) and the outer circumferential direction of the stepped portion (s) to change the shape. Here, the first O-ring part r1 and the second O-ring part r2 positioned in the lower direction of the pair of contact parts 102 serve to support the pair of contact parts 102 in an upward direction. Through the first O-ring portion r1 and the second O-ring portion r2 having a restoring force, the pair of contact portions 102 are excessively bent toward the inner circumferential direction of the cylinder c and the outer circumferential direction of the stepped portion s it can be prevented Therefore, it is possible to realize the increase in durability of the pair of contact portions 102 through the first O-ring portion r1 and the second O-ring portion r2, which is the breakage and replacement timing of the sealing member for the hydraulic cylinder according to the present invention. has the effect of preventing and delaying

6 is a cross-sectional view illustrating the arrangement of the first sealing part 100 , the second sealing part 200 , the third sealing part 300 , and the cover part 400 according to the second embodiment of the present invention. Compared with the first embodiment, the second embodiment of the present invention further includes a first protruding pressing part 103 , a third sealing part 300 and a third O-ring part r3 . A more detailed description of the third O-ring part r3 will be described later with reference to FIG. 7 .

The first protruding pressing portion 103 presses the third sealing portion 300 to be described later to maintain airtightness between the cylinder (c) and the stepped portion (s). To this end, the first protruding pressing part 103 is formed along the first sealing part 100 formed in an annular shape and is provided in the lower direction of the first sealing part 100 . In detail, the first protruding pressing part 103 is formed to have a “T”-shaped cross-sectional shape, and is located in the upper direction of the third sealing part 300 . In addition, the first protruding pressing part 103 makes surface contact with the upper surface of the third sealing part 300 . In detail, in a state where the first protruding pressing part 103 and the third sealing part 300 are in contact, the third sealing part 300 is pressed in the downward direction according to the downward pressing of the cover part 400 to be described above. do. Accordingly, the third sealing part 300 is pressed in the downward direction to have a volume change in which the length in the vertical direction decreases and the length in the left and right directions increases. For this reason, both sides of the third sealing part 300 facing the inner circumferential surface of the cylinder c and the outer circumferential surface of the stepped portion s (meaning the surfaces facing each of the left and right directions in FIG. 7) are the cylinder (c) The inner circumferential surface and the outer circumferential surface of the stepped portion (s) form a surface contact, respectively. Therefore, it is possible to more firmly perform airtight maintenance between the cylinder (c) and the piston (p). As a more preferred embodiment, the first protruding pressing part 103 may be inserted into the second opening 301 formed by opening the upper surface of the third sealing part 300 to be described later. In detail, a second opening 301 corresponding to the size and shape of the first protruding pressing part 103 is provided on the upper surface of the third sealing part 300 , and the third sealing part 300 is provided with the second opening ( 301) and maintains airtightness by more easily changing the shape of the third sealing part 300 as the third sealing part 300 is pressed in both directions when the cover part 400 is pressed in the downward direction. can make it A more detailed description thereof will be provided later in the description of the third sealing part 300 .

The third sealing portion 300 maintains airtightness between the cylinder (c) and the stepped portion (s). In detail, the third sealing part 300 maintains airtightness by making surface contact with the inner peripheral surface of the cylinder (c) and the outer peripheral surface of the stepped part (s), respectively. To this end, the third sealing part 300 is located in the lower direction of the first sealing part 100 . In detail, the third sealing part 300 is disposed between the first sealing part 100 and the piston (p). That is, the lower surface of the third sealing part 300 is in contact with the upper surface of the piston (p), and the upper surface is in contact with the above-described first protruding pressing part 103 . Accordingly, the third sealing part 300 may be firmly disposed without being separated between the first sealing part 100 and the piston (p).

The third sealing part 300 further includes a second opening 301 . The second opening 301 is configured to allow the third sealing part 300 to easily maintain airtightness even with a smaller force. To this end, the second opening 301 is provided to be opened downward from the upper surface of the third sealing part 300 . In addition, the second opening 301 is formed to correspond to the size and shape of the first protruding pressing part 103 described above. Accordingly, after the first protruding pressing part 103 is inserted into the second opening 301 , the third sealing part 300 is moved in both directions ( FIG. 7 ) in response to the downward pressure of the cover part 400 . in the left direction and right direction) to change the shape to increase the volume to maintain airtightness. In addition, the third sealing part 300 is made of a material such as MC nylon, similar to the above-described first sealing part 100 and the second sealing part 200, which occurs during the reciprocating motion of the piston (p). It minimizes friction and may not be thermally deformed or damaged by heat generated by friction. As a more preferred embodiment, the width of the portion excluding the second opening 301 from the upper surface of the second opening 301 (meaning the length in the left and right direction in FIG. 6 ) and the width of the first protruding pressing part 103 is The sum may be provided to be greater than the distance between the cylinder (c) and the stepped portion (s). This is on both sides of the third sealing part 300 when the first protruding pressing part 103 is inserted into the second opening 301 on the same principle as the above-described second protruding pressing part 203 and the pair of contact parts 102 . This is to facilitate shape change in the direction of the inner peripheral surface of the cylinder (c) and the outer peripheral surface of the stepped portion (s), respectively. Through this, the third sealing part 300 can easily perform airtight maintenance only by inserting the second protruding pressing part 203 into the second opening 301 without a separate external force.

Hereinafter, the airtight maintenance process of the third sealing part 300 will be described in more detail. The third sealing part 300 located between the piston p and the first sealing part 100 in a state in which the first protruding pressing part 103 is inserted into the second opening 301 is the cover part 400 . The shape is changed by pressing in the downward direction. In detail, the length of the first protruding pressing part 103 is decreased by pressing in the downward direction of the cover part 400 in the state inserted into the second opening 301, and the length in both directions (in FIG. 6 ) is reduced. means a volume change with increasing length in the left and right directions of In response to the volume change of the first protruding pressing part 103, the third sealing part 300 in contact with the first protruding pressing part 103 is directed toward the inner peripheral surface of the cylinder (c) and the outer peripheral surface of the stepped part (s). The length of the furnace increases to make surface contact. Therefore, the third sealing part 300 can firmly maintain the airtightness between the cylinder (c) and the piston (p).

Since it is possible to maintain the airtight between the cylinder (c) and the piston (p) through the third sealing unit 300 in addition to the first sealing part 100 and the third sealing part 300 as described above, a multiple airtight maintenance effect is derived. can do. In addition, since the first sealing part 100, the second sealing part 200 and the third sealing part 300 are not built into the cylinder (c) and are disposed between the piston (p) and the cylinder (c), It is possible to achieve continuous airtight maintenance in response to the reciprocating motion of the piston (p).

7 is a cross-sectional view showing the third O-ring part r3 according to the second embodiment of the present invention.

The third O-ring part r3 has the same purpose as the above-described first O-ring part r1 . In detail, the third O-ring portion (r3) maintains airtightness between the cylinder (c) and the stepped portion (s). To this end, the third O-ring portion r3 is formed in an annular shape and has a circular cross-sectional shape. In addition, the third O-ring part r3 is located in the third space 130 formed between the first sealing part 100 and the third sealing part 300 . In detail, the third space 130 is formed between the first protruding pressing portion 103 and the third sealing portion 300 in the direction of the inner circumferential surface of the cylinder (c). That is, by inserting the third O-ring part r3 into the third space 130 , the third O-ring part r3 comes into contact with the inner circumferential surface of the cylinder c, and at the same time, the first protruding pressing part 103 and the third It is disposed between the sealing parts 300 . Accordingly, the third O-ring part r3 is pressed in the vertical direction by the first protruding pressing part 103 and the third sealing part 300 when the cover part 400 is pressed in the downward direction, and is pressed in both directions (FIG. 7). By changing the shape to face the left direction and the right direction), it is possible to maintain airtightness by making surface contact with the inner circumferential surface of the cylinder (c).

As another embodiment of the present invention, the third space portion 130 may be provided as a pair and formed to be symmetrical with respect to the first protruding pressing portion 103 . In detail, compared with the second embodiment of the present invention in which the third space 130 is formed in the inner circumferential direction of the cylinder c, the third space 130 according to another embodiment of the present invention is a cylinder (c) may be provided in the direction of the inner circumferential surface and the outer circumferential direction of the stepped portion (s), respectively. In addition, the third O-ring portion r3 may be disposed to be inserted into the pair of third space portions 130 , respectively. This has an additional effect of reducing the friction between the cylinder (c) and the piston (p) together with the airtight maintenance through the third O-ring portion (r3).

Through the configuration of the third O-ring part r3 and the third sealing part 300 as described above and the airtight maintaining action, the first sealing part 100 , the second sealing part 200 , and the first O-ring part r1 are described above. ) and the second O-ring portion (r2) in addition to airtight maintenance can be performed separately, it is possible to prevent the loss of fluid inside the cylinder (c) moving at a greater speed and pressure. In addition, in the process of reciprocating the piston (p) in the vertical direction, the piston (p) and the cylinder (c) are rubbed against each other to prevent frictional heat from being generated, and even if frictional heat is generated, the third sealing part 300 is described above. Since the first sealing part 100 and the second sealing part 200 are made of the same material, it is possible to prevent deterioration and damage.

8 is a view showing the third sealing part 300 and the fourth O-ring part r4 according to the third embodiment of the present invention. Compared with the first embodiment of the present invention, the third embodiment of the present invention has a first protrusion pressing part 103 , a third O-ring part r3 , a third sealing part 300 , and a fourth O-ring part r4 . further includes In detail, the third embodiment of the present invention further includes a fourth O-ring portion r4 as compared with the second embodiment of the present invention.

The fourth O-ring part r4 prevents the fluid from moving from the piston p to the cover part 400 to maintain airtightness. To this end, the fourth O-ring part (r4) is provided with a rubber material having the same elasticity as the first O-ring part (r1), the second O-ring part (r2), and the third O-ring part (r3) to have a restoring force, It is formed in an annular shape with a circular cross section. In addition, the fourth O-ring part r4 is positioned between the third sealing part 300 and the piston p. In detail, a fourth space 310 providing a space in which the fourth O-ring part r4 is disposed is formed in the third sealing part 300 , and the fourth O-ring part r4 is formed in the fourth space 310 . ) by being inserted into the inner peripheral surface of the cylinder (c), the third sealing portion 300 and the upper surface of the piston (p) and in contact with each other. Through this, the fourth O-ring part (r4) is compressed in the vertical direction by the third sealing part 300 and the piston (p) when the cover part 400 is pressed in the downward direction and is extended in both directions. Confidentiality can be maintained by making an interview with the inner circumferential surface.

Through the above-described series of configurations and processes, air tightness can be firmly performed between the cylinder (c) and the piston (p), thereby preventing accidents such as damage to the piston (p) due to fluid loss inside the cylinder (c). can be prevented in advance. In addition, the present invention minimizes friction between the piston (p) and the cylinder (c) by disposing the cylinder (c) and the piston (p) spaced apart by a predetermined interval so as not to contact each other and then disposing the sealing member according to the present invention can do. In addition, according to the present invention, the first sealing part 100 , the second sealing part 200 , the third sealing part 300 , the first O-ring part r1 , the second O-ring part r2 , and the third O-ring part (r3) and the fourth O-ring part (r4) are not built into the inner circumferential surface of the cylinder (c), and only by screwing between the cover part 400 and the stepped part (s) are integral with the piston (p) and reciprocate. Therefore, when replacement of any one configuration is required, only the screw fastening between the cover part 400 and the stepped part (s) is released to release the cover part 400 and then change the configuration that requires replacement, so that easy and quick sealing It is possible to replace the member. That is, it is possible to significantly shorten the stopping time for the hydraulic cylinder (c), thereby increasing the efficiency.

9 is a view showing the overall coupling method of the sealing member for a hydraulic cylinder according to the present invention.

The coupling method of the sealing member for a hydraulic cylinder according to the present invention includes a first arrangement step (s400), a second arrangement step (s500) and a pressure sealing step (s600).

The first arrangement step (s400) is a step of positioning the first sealing part 100 between the cylinder (c) and the piston (p). In detail, in the first arrangement step (s400), by interposing the first sealing part 100 to be located between the inner wall of the cylinder (c) and the outer peripheral surface of the stepped part (s), the cylinder (c) and the piston (p) The separation space that may be formed between them is sealed. To this end, the first sealing part 100 is configured such that the lower surface of the piston (p) is in contact with the upper surface of the piston (p), the above-described pair of contact parts 102 are formed in the upper direction of the first sealing part 100, respectively, the cylinder (c) is provided so as to be in contact with the inner wall and the outer peripheral surface of the stepped portion (s). By providing the first arrangement step (s400), it is possible to primarily maintain the airtightness between the piston (p) and the cylinder (c), thereby effectively preventing the fluid located in the lower direction of the piston (p) from being lost .

The second arrangement step (s500) is a step of positioning the second sealing part 200 between the cylinder (c) and the piston (p). In detail, in the second arrangement step (s500), the second sealing part 200 is positioned in the upper direction of the first sealing part 100 and is inserted to engage with the first sealing part 100 . In more detail, the first opening 101 is formed in the upper direction of the first sealing part 100 , and the second protruding pressing part 203 protruding toward the lower direction of the second sealing part 200 is the second As it is inserted into the first opening 101 , the second sealing part 200 is positioned above the first sealing part 100 . Here, as described above, the width of the pair of contact portions 102 (meaning the length in the left-right direction in FIG. 3) and the width in the left-right direction of the second protruding pressing portion 203 (in the left-right direction in FIG. 3) The sum of the lengths) is provided to be greater than the distance between the cylinder (c) and the stepped portion (s). Accordingly, in the state in which the second protruding pressing part 203 is inserted into the first opening 101 , the pair of contact parts 102 are respectively connected to the inner wall direction of the cylinder c (meaning the left direction in FIG. 3 ) and the end By pressing in the chin part (s) direction (meaning the right direction in FIG. 3), the pair of contact parts 102 more firmly maintain the airtightness between the cylinder (c) and the stepped part (s).

The pressure sealing step ( s600 ) is a step of pressing the cover part in an upper direction and a lower direction of the second sealing part 200 . In detail, in the pressure sealing step (s600), the first sealing part 100 and the second sealing part 200 are pressed in the downward direction so that a pair of contact parts 102 are respectively formed on the inner wall and the stepped part ( s) to achieve more face-to-face contact, so that tighter confidentiality can be carried out. To this end, in the pressure sealing step (s600), the cover part is positioned in the upper direction of the second sealing part 200 . In detail, the cover part is disposed in the upper direction of the second sealing part 200 so that the lower surface is in contact with the upper surface of the second sealing part 200 . In addition, the cover part is fastened to the stepped part s through a fastening means provided separately such as a screw in a state located in the upper direction of the second sealing part 200 . Here, the cover part presses the second sealing part 200 in the downward direction during the screw fastening process of the step part (s) and the cover part. Accordingly, the second protruding pressing part 203 provided in the lower direction of the second sealing part 200 moves the pair of contact parts 102 in both directions (in FIG. 3 ) while being inserted into the first opening 101 . (meaning left and right direction). Therefore, the pair of contact portions 102 can more firmly maintain the airtight between the cylinder (c) and the piston (p). By providing the pressure sealing step (s600), the downward direction of the piston (p) from the space between the cylinder (c) and the piston (p) performed in the aforementioned first arrangement step (s400) and the second arrangement step (s500) It is possible to more effectively block the loss of fluids such as oil located in the In addition, even if cracks occur in the inner wall of the cylinder (c) due to the reciprocating motion of the piston (p) in the vertical direction compared to the case where the pressure sealing step (s600) is not provided, it is possible to continuously maintain airtightness, It can be applied to equipment used in high-vibration environments, so it has great versatility.

The first embodiment of the present invention further includes a second intervening step (s300) in addition to the first arrangement step (s400), the second arrangement step (s500), and the pressure sealing step (s600) described above. The second intervening step (s300) is provided for airtight maintenance between the more rigid cylinder (c) and the piston (p). To this end, the second intervening step s300 precedes the first disposing step s400 , and the first O-ring part r1 is disposed. In detail, in the second intervening step s300 , the first O-ring part r1 is positioned between the inner wall of the cylinder c and the first sealing part 100 . In more detail, as described above, the first sealing part 100 is provided with a first space part 110 , and the first O-ring part r1 is the first sealing part 100 including the cylinder c and the piston ( It is inserted into the first space portion 110 before being inserted between the p). Accordingly, the first sealing part 100 provided by inserting the first O-ring part r1 into the first space part 110 is disposed between the cylinder c and the stepped part s to maintain tighter airtightness. perform the function In the same manner as described above, the second O-ring part r2 is also inserted into the second space 120 provided in the opposite direction of the first space 110 with respect to the first sealing part 100, and the second O-ring In a state in which the portion r2 is inserted into the second space portion 120 , the first sealing portion 100 is positioned between the cylinder c and the stepped portion s. Accordingly, it is possible to more effectively maintain the airtightness between the first sealing portion 100 and the stepped portion (s).

The second embodiment of the present invention further includes a third arrangement step (s100). The third arrangement step (s100) is a step of positioning the third sealing part 300 between the cylinder (c) and the piston (p), and is performed before the first arrangement step (s400). In detail, the third sealing part 300 is inserted so as to be positioned between the inner wall of the cylinder (c) and the outer peripheral surface of the stepped portion (s). Here, the above-described second opening 301 is provided on the upper surface of the third sealing part 300 and corresponds to the size and shape of the first protruding pressing part 103 provided in the lower direction of the first sealing part 100 . Thus, an intaglio is formed in the downward direction. In addition, the sum of the width of the first protruding pressing part 103 (meaning the length in the left and right direction in FIG. 6 ) and the width of the third sealing part 300 (meaning the length in the left and right direction in FIG. 6 ) is a cylinder (c) and is provided to be greater than the distance between the stepped portion (s). That is, as the first protruding pressing part 103 is inserted into the second opening 301 , the third sealing part 300 moves in the direction of the inner wall of the cylinder c (meaning the left direction in FIG. 6 ) and the stepped part ( s) direction (meaning the right direction in FIG. 6) and the shape is deformed. Accordingly, it is possible to more firmly maintain the airtight between the cylinder (c) and the piston (p).

The second embodiment of the present invention further includes a first intervening step (s200). The first intervening step (s200) is provided to further prevent the separation between the cylinder (c) and the piston (p) that may occur during the engagement process of the first sealing part 100 and the third sealing part 300 . . To this end, the first intervening step s200 is provided between the third arranging step s100 and the first arranging step s400. In more detail, when the above-described second intervening step s300 is provided, the first intervening step s200 is provided between the third arranging step s100 and the second intervening step s300, and the second intervening step When (s300) is not performed, the first intervening step (s200) is provided between the third arrangement step (s100) and the first arrangement step (s400). In addition, in the first intervening step s200 , the third O-ring part r3 is positioned between the first sealing part 100 and the third sealing part 300 . In detail, as described above in FIG. 7 , a third space 130 is further provided between the first sealing part 100 and the third sealing part 300 , and the third O-ring part r3 is 3 is located in the space 130 . That is, the third O-ring part r3 is disposed in the third space 130 located in the upper direction of the third sealing part 300 , and as the above-described first arranging step s400 proceeds, the third sealing part proceeds. It is located between the part 300 and the first sealing part 100 . In addition, the third O-ring part (r3) is interposed between the first sealing part 100 and the third sealing part 300 through the pressure sealing step (s600) in which the pressure in the downward direction of the cover part is performed. Pressurized to make surface contact with the inner wall of the cylinder (c). Accordingly, it is possible to prevent the separation between the cylinder (c) and the piston (p) and to maintain a tighter seal.

As a more preferred embodiment, the third embodiment of the present invention may further include a third intervening step compared to the second embodiment. The third intervening step is provided to position the fourth sealing part between the cylinder c and the third sealing part 300 . To this end, the third intervening step precedes the third disposing step s100. In detail, in the third intervening step, the fourth O-ring portion r4 is positioned between the cylinder c and the stepped portion s, but when the third disposing step (s100) is performed after the third intervening step is performed It is arranged to be pressed by the third sealing part 300 . In more detail, the fourth space 310 is formed in the lower direction of the third sealing part 300 according to the third embodiment of the present invention, and the fourth sealing part is provided to be located in the fourth space 310 . . Accordingly, through the third intervening step, the fourth sealing portion provided between the cylinder (c) and the stepped portion (s) is the inner wall of the cylinder (c) in the third arrangement step (s100), the upper surface of the piston (p) and It is pressed by the third sealing part 300 to make surface contact with the inner wall of the cylinder (c). Therefore, it is possible to effectively maintain the airtightness between the cylinder (c) and the piston (p).

Through the configuration and process as described above, it is possible to seal the space that can be spaced apart between the piston (p) and the cylinder (c) to prevent the loss of fluid in advance. In addition, in response to the abrasion of the cylinder (c) and the piston (p) according to the reciprocating motion of the piston (p) in the vertical direction, the first sealing part 100, the second sealing part 200, the third sealing part ( 300), the first O-ring part (r1), the second O-ring part (r2), the third O-ring part (r3), and the fourth O-ring part (r4) to maintain airtightness between the cylinder (c) and the piston (p) Therefore, it is possible to prevent the loss of fluid inside the cylinder (c) that may occur when the piston (p) and the cylinder (c) are worn, and additionally, the hydraulic cylinder (c) from time to time for maintenance of the piston (p) and the cylinder (c). ), it is possible to reduce the inconvenience of stopping, so that the convenience can be remarkably increased.

The above-described preferred embodiments of the present invention are disclosed for the purpose of illustration, and those skilled in the art with ordinary knowledge for the present invention will be able to make various modifications, changes and additions within the spirit and scope of the present invention. should be considered to be within the scope of the above claims.

Those of ordinary skill in the art to which the present invention pertains, within the scope of not departing from the technical spirit of the present invention, various substitutions, modifications and changes are possible, so the present invention is described in the above-described embodiments and the accompanying drawings. not limited by

p: piston s: step
c: cylinder 100: first sealing part
101: first opening 102: contact portion
103: first protruding pressing part 110: first space part
120: second space 130: third space
200: second sealing part 203: second protruding pressing part
300: third sealing part 301: second opening
310: fourth space r1: first O-ring part
r2: second o-ring part r3: third o-ring part
r4: fourth O-ring part

Claims (13)

A sealing member for a hydraulic cylinder, comprising:
a first sealing part 100 provided between the cylinder and the piston positioned inside the cylinder to maintain airtightness; and
A second sealing part 200 that is located in the upper direction of the first sealing part 100 and maintains airtightness by pressing the first sealing part 100 in the downward direction; Hydraulic cylinder comprising a; sealing member for use.
The method of claim 1,
The first sealing part 100 is opened in an upward direction to form a first opening 101,
In the upper direction of the first sealing part 100, it is inclined at a predetermined angle and further comprises a pair of contact parts 102 that are in contact with the outer peripheral surface of the stepped part (s) and the inner peripheral surface of the cylinder (c), respectively. A sealing member for a hydraulic cylinder.
The method of claim 1,
A first O-ring part r1 positioned between the inner circumferential surface of the cylinder c and the first sealing part 100 and a first O-ring part r1 positioned between the first sealing part 100 and the stepped part s 2 It further comprises an O-ring part (r2),
The first O-ring part (r1) and the second O-ring part (r2) are inserted and disposed in the direction of the inner circumferential surface of the cylinder (c) and the outer circumferential direction of the stepped part (s) of the first sealing part 100 . A sealing member for a hydraulic cylinder, characterized in that each of the space portion 110 and the second space portion 120 is provided.
4. The method according to claim 2 or 3,
In the lower direction of the second sealing part 200,
A second protrusion that is inserted into the first opening 101 and spreads apart the pair of contact parts 102 in the cylinder direction and the stepped direction in response to the downward pressure of the second sealing part 200 , respectively. A sealing member for a hydraulic cylinder, characterized in that the pressing part (203) is provided.
5. The method of claim 4,
The second protruding pressing part 203 is a sealing member for a hydraulic cylinder, characterized in that it is inclined so that the width of the upper end is greater than the width of the lower end.
6. The method of claim 5,
The width of the pair of contact portions 102 and the width of the second protruding pressing portion 203 disposed when inserted into the first opening 101 than the distance between the cylinder (c) and the stepped portion (s) The sealing member for a hydraulic cylinder, characterized in that the second protruding pressing part (203) is formed so that the sum is large.
The method of claim 1,
A sealing member for a hydraulic cylinder, characterized in that it further comprises a third sealing part (300) positioned in the lower direction of the first sealing part (100) and maintaining airtightness.
8. The method of claim 7,
In the lower direction of the first sealing part 100 , the third sealing part 300 is pressed in the downward direction through surface contact with the upper surface of the third sealing part 300 to maintain airtightness. A portion 103 is further provided,
A sealing member for a hydraulic cylinder, characterized in that a second opening (301) is formed on the upper surface of the third sealing part (300) so that the first protruding pressing part (103) is inserted.
9. The method of claim 8,
A third O-ring part r3 provided between the first protruding pressing part 103 and the third sealing part 300 and maintaining airtightness in response to the downward pressure of the first sealing part 100 . further comprising,
The third O-ring portion (r3) is a sealing member for a hydraulic cylinder, characterized in that it is located in the third space portion (130) formed between the first protruding pressing portion (103) and the cylinder (c).
9. The method of claim 8,
Positioned between the third sealing part 300 and the piston (p), hydraulic pressure characterized in that it further comprises a fourth O-ring part (r4) for maintaining airtightness between the piston (p) and the cylinder (c) Sealing member for cylinder.
A method of coupling a sealing member for a hydraulic cylinder, comprising:
A first arrangement step (s400) of interposing a first sealing part 100 between the cylinder and the piston positioned inside the cylinder;
The second sealing part 200 is positioned in the upper direction of the first sealing part 100 , and the second protruding pressing part 203 is formed in the first opening 101 provided on the upper surface of the first sealing part 100 . ) a second arrangement step of inserting to be in contact (s500); and
By placing the cover part 400 on the upper surface of the second sealing part 200 and pressing in the downward direction, the pair of contact parts 102 positioned in the upper direction of the first sealing part 100 are respectively formed by a cylinder and A method of coupling a sealing member for a hydraulic cylinder, characterized in that it comprises a; pressure sealing step (s600) spread apart in the piston direction.
12. The method of claim 11,
Combination of a sealing member for a hydraulic cylinder, characterized in that it further comprises a third arrangement step (s100) of positioning the third sealing part 300 between the cylinder and the piston before the first arrangement step (s400) Way.
12. The method of claim 11,
It is provided between the third arrangement step (s100) and the first arrangement step (s400), and the third O-ring portion r3 is positioned between the third sealing portion 300 and the first sealing portion 100 . a first intervening step (s200); and
Provided between the first intervening step (s200) and the first disposing step (s400), the first in the first space portion 110 provided between the contact portion 102 and the first sealing portion (100) A second intervening step (s300) of locating the O-ring part (r1); characterized in that it further comprises, the coupling method of the sealing member for a hydraulic cylinder.

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