hydraulic device

Abstract

An aspect of the present application provides a hydraulic device including: a main shaft portion having a hollow inside; a cylinder assembly including a hollow cylinder portion and a piston rod reciprocally movable inside the cylinder portion, and inserted through an inlet of the main shaft portion; a flange portion surrounding the piston rod, disposed at an inlet side of the cylinder portion, and in contact with an inner peripheral surface of the main shaft portion; and a sealant disposed between the flange portion and a face of a bent portion facing the flange portion, the bent portion being bent around the flange portion at the inlet of the main shaft portion.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to a hydraulic device such as a gas spring or a gas cylinder. BACKGROUND

[0002] A gas cylinder or a gas spring is a device that can fix a cylinder or an applied force with a target length using hydraulic pressure. The inside of the gas cylinder or the gas spring is filled with high-pressure nitrogen gas (N2) in general, and the flow of the gas is controlled by opening or closing an orifice through a bleeder pin or a valve, so that the overall length can be adjusted.

[0003] At this time, the gas cylinder or the gas spring can exhibit its performance only if the pressure inside the cylinder is maintained, and thus the gas cylinder or the gas spring has a sealing system including a plurality of rings for preventing the gas from flowing to the outside.

[0004] The background art of the present application is disclosed in Korean Patent Laid-open Publication No. 10-2015-0110124 (published on October 2, 2015, Invention Title: Gas Cylinder).

[0005] The above background art is technical information that the inventor has grasped for deriving the present application or technical information that is learned in the process of deriving the present application, and does not necessarily mean a known art that is publicly known to the general public before the filing of the present application. SUMMARY

[0006] TECHNICAL PROBLEM

[0007] An object of embodiments of the present application is to provide a hydraulic device capable of preventing a fluid contained inside from flowing to the outside by arranging a sealant between a flange portion and an inner circumferential surface of a main shaft portion.

[0008] TECHNICAL SOLUTION

[0009] One aspect of the present application provides a hydraulic device including: a main shaft portion having a hollow inside; a cylinder assembly including a hollow cylinder portion and a piston rod reciprocally movable inside the cylinder portion and inserted through an inlet of the main shaft portion; a flange portion surrounding the piston rod, arranged at an inlet side of the cylinder portion, and in contact with an inner circumferential surface of the main shaft portion; and a sealant arranged between the flange portion and one surface of a bent portion facing the flange portion, the bent portion being bent around the flange portion at the inlet of the main shaft portion.

[0010] In addition, the sealant can be in a liquid phase first and then solidified.

[0011] Further, a step portion can be formed on the flange portion, having different diameters along a central axis of the piston rod length direction.

[0012] Further, the sealant can be disposed on an inner circumferential surface of the bent portion.

[0013] Further, the sealant can be disposed between an end portion of the bent portion facing the piston rod and an outer circumferential surface of the step portion formed on the flange portion.

[0014] Further, the sealant can be disposed between the other side opposite to the flange portion side where the step portion is formed and the inner circumferential surface of the bent portion.

[0015] Further, a first groove portion can be formed on one side of the flange portion, having a predetermined depth, in parallel with a central axis of the piston rod along an outer circumferential length, and further including a first ring portion disposed in the first groove portion in a ring shape.

[0016] Further, the first ring portion can be formed of a rubber material or a resin material.

[0017] Further, a second groove portion can be formed on the flange portion, having a predetermined depth, along an outer circumferential length of an outer circumferential surface facing an inner circumferential surface of the main shaft portion, and further including a second ring portion disposed in the second groove portion and in contact with the inner circumferential surface of the main shaft portion.

[0018] Further, the second ring portion can be formed of a rubber material or a resin material.

[0019] Further, an air seal member can be further included, surrounding the piston rod and disposed between the flange portion and the cylinder portion.

[0020] Further, an opening holder can be further included, surrounding the piston rod and disposed between the air seal member and the cylinder portion, for covering the cylinder portion.

[0021] Further, a support portion can be further included, surrounding the piston rod and coupled thereto, for supporting a load of the piston rod.

[0022] Further, the cylinder assembly can further include a pipe holder assembly including a valve disposed on the other side opposite to the main shaft portion side where the flange portion is disposed, coupled to one end portion of the cylinder portion, and including a valve for opening and closing a fluid flow path.

[0023] Further, a driving portion can be further included, coupled to the valve and provided on the main shaft portion, for opening and closing the fluid flow path by transmitting power to the valve.

[0024] According to another aspect of the present application, there is provided a hydraulic device including: a main shaft portion having a hollow interior; a cylinder assembly including a hollow cylinder portion and a piston rod reciprocally movable within the interior of the cylinder portion, and inserted through an inlet of the main shaft portion; a flange portion surrounding the piston rod, disposed on an inlet side of the cylinder portion, and in contact with an inner peripheral surface of the main shaft portion; and a first sealant disposed between the flange portion and a surface of a bent portion facing the flange portion, the bent portion being bent around the flange portion at the inlet of the main shaft portion, at least a portion of the inner peripheral surface of the main shaft portion being frictionally coated with a second sealant to form a sealant film.

[0025] According to still another aspect of the present application, there is provided a hydraulic device including: an outer cylinder; an inner cylinder sharing a central axis with the outer cylinder and disposed inside the outer cylinder; a piston rod assembly including a piston rod reciprocally movable within the interior of the inner cylinder; and a piston valve provided on the piston rod and providing a fluid flow path between the outer cylinder and the inner cylinder; a free piston for dividing a space between the outer cylinder and the inner cylinder and movable in contact with an inner peripheral surface of the outer cylinder and an outer peripheral surface of the inner cylinder, respectively; a flange portion surrounding the piston rod, disposed on an inlet side of the outer cylinder, and in contact with an inner peripheral surface of the outer cylinder; and a sealant disposed between the flange portion and a surface of a bent portion facing the flange portion, the bent portion being bent around the flange portion at the inlet of the outer cylinder.

[0026] Further, the sealant can be in a liquid phase before being solidified.

[0027] Further, a step portion can be formed on the flange portion, the step portion having different diameters along the central axis of the piston rod in the length direction.

[0028] According to still another aspect of the present application, there is provided a hydraulic device including: a main shaft portion having a hollow interior; a cylinder assembly including a hollow cylinder portion and a piston rod reciprocally movable within the interior of the cylinder portion, and inserted through an inlet of the main shaft portion; a flange portion surrounding the piston rod, disposed on an inlet side of the cylinder portion, and in contact with an inner peripheral surface of the main shaft portion; and a sealant disposed between the inner peripheral surface of the main shaft portion formed with a protrusion protruding toward the central axis of the main shaft portion in the length direction at the inlet of the main shaft portion and an outer peripheral surface of the flange portion.

[0029] Other aspects, features, advantages, and the like, of the foregoing will be apparent from the drawings, claims, and detailed description of the application.

[0030] Advantages

[0031] An embodiment of the present application has an effect of being able to prevent fluid in the interior from flowing out to the exterior through a gap formed between the flange portion and the main shaft portion, by arranging a sealant between the flange portion and the inner peripheral surface of the main shaft portion.

[0032] Of course, the scope of the present application is not limited to the above effects. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a front sectional view of a flange portion according to an embodiment of the present application.

[0034] Figure 2 is a front sectional view of a hydraulic device provided with a flange portion according to an embodiment of the present application.

[0035] Figure 3 is Figure 2 is an enlarged view of A portion of

[0036] Figure 4 is a view illustrating a configuration element of Figure 3

[0037] Figure 5 is a state view in which the position of a sealant in A portion of Figure 2

[0038] Figure 6 is a front sectional view of a flange portion according to another embodiment of the present application.

[0039] Figure 7 is a front sectional view of a hydraulic device provided with a flange portion according to another embodiment of the present application.

[0040] Figure 8 is Figure 7 is an enlarged view of B portion of

[0041] Figure 9a , Figure 9b and Figure 10 is a state view in which the position of a sealant in B portion of Figure 7

[0042] Figure 11 is a view illustrating a drive portion according to another embodiment in C portion of Figure 2

[0043] Figure 12 is a front sectional view of a hydraulic device according to another embodiment of the present application.

[0044] Figure 13 is Figure 12 is an enlarged view of D portion of

[0045] Figure 14 and Figure 15 ​​​​is a partial enlarged view of a hydraulic device according to a further embodiment of the present application.

[0046] Figure 16 is a front sectional view of a hydraulic device according to a further embodiment of the present application.

[0047] Figure 17 is Figure 16 is an enlarged view of E portion of DETAILED DESCRIPTION

[0048] The present application can be modified in various ways and has various embodiments, and specific embodiments are exemplified in the accompanying drawings and described in detail in the detailed description section. The effects, features, and implementation methods of the present application will become more apparent by taking a reference of the accompanying drawings and embodiments described in detail below. However, the present application can be implemented in various forms and is not limited to the embodiments described below.

[0049] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings. In describing the embodiments, the same or similar components will be designated by the same reference numerals, and repetitive description concerning them will be omitted.

[0050] In the following embodiments, the terms "first", "second", and the like are used to distinguish one component from other components, and are not intended to limit the meaning.

[0051] In the following embodiments, the singular expression includes the plural expression unless it is explicitly given other definition in the context.

[0052] In the following embodiments, the terms "include" or "have" or the like mean that the features or components described in the specification are present, and are not intended to preclude the possibility of adding at least one other feature or component.

[0053] In the following embodiments, when a part such as a film, a region, or a component is on top of or under another part, it includes the case where it is directly on top of the other part, and also includes the case where other films, regions, or components are provided therebetween.

[0054] For convenience of explanation, the size of the components in the drawings can be enlarged or reduced. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present application is not necessarily limited to what is shown in the drawings.

[0055] When a certain embodiment can be implemented independently, a specific process sequence can also be performed in an order different from that described. For example, two processes described in succession can also be performed substantially at the same time, or in the reverse order of the described sequence.

[0056] In the following embodiments, when a film, a region, a component, or the like is described as being connected, a case in which the film, the region, and the component are directly connected is included, and a case in which other films, regions, and components are provided between the film, the region, and the component and are indirectly connected is also included. For example, in the present specification, when a film, a region, a component, or the like is described as being electrically connected, a case in which the film, the region, and the component are directly electrically connected is included, and a case in which other films, regions, and components are provided therebetween and are indirectly electrically connected is also included.

[0057] First, a hydraulic device according to an embodiment of the present application will be described. Figure 1 is a front sectional view of a flange portion according to an embodiment of the present application. Figure 2 is a front sectional view of a hydraulic device provided with a flange portion according to an embodiment of the present application. Figure 3 is Figure 2 is an enlarged view of a portion A of Figure 5 is a state view in which a sealant position is changed in a portion A of Figure 2 Figure 6 is a front sectional view of a flange portion according to another embodiment of the present application. Figure 7 is a front sectional view of a hydraulic device provided with a flange portion according to another embodiment of the present application. Figure 8 is Figure 7 is an enlarged view of a portion B of Figure 9a , Figure 9b and Figure 10 is a state view in which a sealant position is changed in a portion B of Figure 7 Figure 11 is a view of a driving portion according to another embodiment in a portion C of Figure 2

[0058] The flange portion (1300) of the embodiment of the present application has two embodiments according to the presence or absence of a second groove portion (1350) described later, and in Figure 1 to Figure 5 , Figure 11 , a hydraulic device (1000) having a flange portion (1300) according to the first embodiment is described, and in Figure 6 to Figure 10 , a hydraulic device (1000) having a flange portion (1300) according to the second embodiment is described.

[0059] <Hydraulic Device Having Flange Portion According to First Embodiment>

[0060] Referring to Figure 1 to Figure 5 , the hydraulic device (1000) can include a main shaft portion (1100), a cylinder assembly (1200), a flange portion (1300), a sealant (1400), a first ring portion (1510), an air seal (1600), an opening holder (1700), a support portion (1800), and a driving portion (1900). ​​​

[0061] Reference Figure 2 to Figure 5 According to an embodiment of the present invention, the spindle portion (1100) is used to form the shape of the hydraulic device (1000), with the central axis in the length direction as a reference, and both sides (with) Figure 2 An opening is formed on the upper and lower sides (based on the reference) for insertion of the cylinder assembly (1200) described later.

[0062] Reference Figure 2 It can be achieved by using one side of the main shaft portion (1100) according to an embodiment of the present invention (with) Figure 2 The cylinder block assembly (1200) is inserted into the lower side (based on the reference side). The main shaft portion (1100) for inserting the cylinder block assembly (1200) is located on one side (with...). Figure 2 The opposite side (based on the lower side) Figure 2 On the upper side (based on the reference), a tube support assembly (1250) and a drive unit (1900), which will be described later, may be arranged.

[0063] Reference Figure 2 According to an embodiment of the present invention, a sealant (1400, 1401) may be arranged in a predetermined area on the inner peripheral surface of the spindle portion (1100).

[0064] Specifically, a pre-defined area can be coated with sealant (1400, 1401) on the inner circumferential surface of the main shaft portion (1100) facing the cylinder block assembly (1200). When the tube support assembly (1250) is inserted into the main shaft portion (1100), the sealant (1400) is rubbed and coated, thereby forming a sealant film (1400L).

[0065] In this invention, the sealant (1400, 1401, 1402) can be an anaerobic resin, which is initially in a liquid phase, a semi-liquid phase, and a solid phase, and solidifies, i.e., cures, if air is blocked. The sealant (1400, 1401, 1402) may include, for example, polyester resins such as methacrylate ester or fluoropolymers such as polytetrafluoroethylene (PTFE), but the invention is not limited thereto.

[0066] The sealant (1400) used to form the sealant film (1400L) can be applied at a position at a preset distance from the inlet of the main shaft (1100), specifically at a distance of 5 to 10 mm.

[0067] The sealant (1400) for forming the sealant film (1400L) can be applied in an amount of about 1 cc to 3 cc, but is not limited thereto, and various modifications can be made in consideration of the length of the spindle portion (1100) and other design conditions.

[0068] The sealant film (1400L) can be obtained after a curing process under anaerobic conditions. The curing process can be performed for about 24 hours at room temperature, but the present application is not limited thereto. The sealant (1400) for forming the sealant film (1400L) will be described in detail later.

[0069] Referring to Figure 2 to Figure 5 , the inner side of the entrance of the spindle portion (1100) according to an embodiment of the present application can be provided with a flange portion (1300) to be described later, and a bent portion (1110) can be formed around the flange portion (1300) and bent at the entrance of the spindle portion (1100).

[0070] In the present specification, the 'bent portion (1110)' as a section provided in advance at the entrance side of the spindle portion (1100) can include a region around the lower end of the flange portion (1300) (with reference to the center) and having an inner peripheral surface formed in a curved shape, and a portion in contact with the outer peripheral surface of the flange portion (1300) and formed in a cylindrical shape. Figure 2

[0071] Referring to Figure 2 to Figure 5 , the inner side of the spindle portion (1100) is inserted with the cylinder assembly (1200) to be described later, the gas seal (1600), the opening holder (1700), and the flange portion (1300), and the bent portion (1110) formed at the entrance side of the spindle portion (1100) can be curled around the flange portion (1300).

[0072] The bent portion (1110) is formed in the spindle portion (1100) and surrounds the flange portion (1300), so that the inner peripheral surface of the spindle portion (1100) is in close contact with the flange portion (1300), thereby having an effect of preventing the flange portion (1300) from being separated from the inner side of the spindle portion (1100).

[0073] Referring to Figure 2 , the cylinder assembly (1200) according to an embodiment of the present application shares a lengthwise central axis with the spindle portion (1100) and is inserted into the inside of the spindle portion (1100), and can include a cylinder portion (1210), a piston rod (1230), and a tube holder assembly (1250).

[0074] Referring to Figure 2 , the cylinder portion (1210) according to an embodiment of the present application is formed in a tubular shape with a hollow interior, and the interior can provide a space for filling a fluid formed of a compressed gas such as nitrogen.​

[0075] The piston rod (1230) according to an embodiment of the present application is moved in the cylinder portion (1210) by hydraulic pressure, and can be moved in the up-down direction with respect to the reference direction. Figure 2 The piston rod (1230) can be arranged along the central axis of the length direction of the cylinder portion (1210), and can include a piston head (1231) and a rod body (1235).

[0076] The piston rod (1230) can be arranged along the central axis of the length direction of the cylinder portion (1210), and can include a piston head (1231) and a rod body (1235).

[0077] Referring to Figure 2 , the rod body (1235) is formed to extend in the up-down direction with respect to the reference direction, and shares the central axis with the main shaft portion (1100) and the cylinder portion (1210). Figure 2 Referring to

[0078] , the piston head (1231) is coupled to one end (the upper end with respect to the reference direction) of the rod body (1235), can be closely attached to the inner circumferential surface of the cylinder portion (1210), and can divide the internal space of the cylinder portion (1210). Figure 2 Figure 2 Referring to , the piston head (1231) is coupled to one end (the upper end with respect to the reference direction) of the rod body (1235), can be closely attached to the inner circumferential surface of the cylinder portion (1210), and can divide the internal space of the cylinder portion (1210).

[0079] Figure 2 Referring to , the piston rod (1230) according to an embodiment of the present application can include the rod body (1235) and the flange portion (1300) described below. The flange portion (1300) can be arranged on the outer side of the rod body (1235), and can be coupled to the main shaft portion (1100).

[0080] Figure 2 The pipe support assembly (1250) according to an embodiment of the present application is arranged on the other side (the upper side with respect to the reference direction) opposite to the side (the lower side with respect to the reference direction) on which the flange portion (1300) is arranged, and can be coupled to one end (the upper end with respect to the reference direction) of the cylinder portion (1210). Figure 2 Figure 2 Referring to , the pipe support assembly (1250) according to an embodiment of the present application can include a pipe support body (1251), an O-ring (1253), and a valve (1255). The pipe support body (1251) can cover one end (the upper side with respect to the reference direction) of the cylinder portion (1210), and can seal the fluid inside the cylinder portion (1210).

[0081] Figure 2 The pipe support body (1251) and the O-ring (1253) are formed to protrude more in the diameter direction than the cylinder portion (1210). Figure 2 The pipe support body (1251) and the O-ring (1253) are formed to protrude more in the diameter direction than the cylinder portion (1210).

[0082] Referring to

[0083] , the pipe support assembly (1250) according to an embodiment of the present application can include the pipe support body (1251), the O-ring (1253), and the valve (1255). The pipe support body (1251) can cover one end (the upper side with respect to the reference direction) of the cylinder portion (1210), and can seal the fluid inside the cylinder portion (1210). Figure 2 ​​A gap is formed between the outer circumferential surface of the cylinder portion (1210) and the inner circumferential surface of the main shaft portion (1100), through which fluid can flow, and the piston rod (1230) reciprocates inside the cylinder portion (1210) to thereby adjust the stroke of the hydraulic device (1000).

[0084] A fluid flow path is formed in the pipe holder body (1251) according to an embodiment of the present application, and a valve (1255) for opening and closing the fluid flow path can be provided. The valve (1255) receives power transmitted from a driving portion (1900) to be described later, and is movable on the pipe holder body (1251).

[0085] Thus, if the user applies pressure to the driving portion (1900), the driving portion (1900) will press the valve (1255), and as the position of the valve (1255) changes, it has the effect of being able to open and close the flow passage, i.e., the orifice (1252), formed in the pipe holder body (1251).

[0086] Referring to Figure 2 The pipe holder assembly (1250), specifically the pipe holder body (1251), according to an embodiment of the present application, can have a width that is the same as the width (diameter) of the inner circumferential surface of the main shaft portion (1100). Thus, the pipe holder body (1251) will be in contact with the inner circumferential surface of the main shaft portion (1100).

[0087] Further, the cylinder portion (1210) formed to have a width that is smaller than the width of the pipe holder assembly (1250), specifically the pipe holder body (1251), can be inserted in a state of being spaced apart from the inner circumferential surface of the main shaft portion (1100), and the spacing between the cylinder portion (1210) and the inner circumferential surface of the main shaft portion (1100) can provide a passage through which fluid such as gas can flow when the hydraulic device (1000) operates, as will be described later.

[0088] Further, since the pipe holder assembly (1250) is in contact with the inner circumferential surface of the main shaft portion (1100), when the cylinder assembly (1200) is inserted into the inside of the main shaft portion (1100), the sealant (1400) applied by friction to the inner circumferential surface of the main shaft portion (1100) can be pushed.

[0089] That is, the sealant (1400) is applied by friction to the inner circumferential surface of the main shaft portion (1100) by the cylinder assembly (1200), specifically the pipe holder assembly (1250), and has the effect of forming a cylindrical sealant film (1400L).

[0090] Other components constituting the pipe holder assembly (1250) are well-known technologies, and thus detailed descriptions thereof are omitted.

[0091] Referring to Figure 1 to Figure 5According to the first embodiment of the present invention, the flange portion (1300) surrounding the piston rod (1230) is specifically a rod body (1235), which can be arranged on the inlet side of the cylinder portion (1210) and in contact with the inner circumferential surface of the main shaft portion (1100).

[0092] An airtight seal (1600) and an opening support (1700), described later, may be arranged between the flange (1300) and the cylinder (1210). The flange (1300) may be directly or indirectly connected to the inlet of the cylinder (1210).

[0093] Reference Figure 1 , Figure 2 One side of the flange (1300) Figure 1 The lower side (based on the reference) can be formed with a stepped portion (1310) so that the diameter is set differently along the length direction axis. Therefore, when the main shaft portion (1100) surrounds one side of the flange portion (1300) (with Figure 1 When the lower end of the main shaft (1100) is curled (based on the lower side), the main shaft (1100) is (with the lower side as the reference). Figure 2 (Based on) can be arranged to face the step difference section (1310).

[0094] Referring to the flange portion (1300) of the second embodiment described later, Figure 10 A sealant (1400, 1401) is applied in a ring along the circumference between the step section (1310) and one end of the main shaft section (1100) facing it, thereby preventing fluid from flowing out between the main shaft section (1100) and the flange section (1300).

[0095] Figure 10 The illustration shows a case where a sealant (1400, 1401) is applied between the end of the step portion (1310) formed on the flange portion (1300) according to the second embodiment and the end of the main shaft portion (1100). However, it is not limited to this and can be implemented in various variations, such as applying a sealant (1400, 1401) between the end of the step portion (1310) formed on the flange portion (1300) according to the first embodiment and the end of the main shaft portion (1100).

[0096] Reference Figure 1 to Figure 5 According to the first embodiment of the present invention, one side of the flange portion (1300) is (with) Figure 1 A first groove (1330) can be formed on the top of the piston rod (1230) as a reference. The first groove (1330) is parallel to the central axis of the piston rod (1230) along the outer perimeter with the piston rod (1230) as the center and has a preset depth.

[0097] Specifically, the first groove (1330) is formed on the side of the flange (1300) facing the inlet side of the cylinder body (1210). Figure 2The first groove portion (1330) is formed in the flange portion (1300) in a ring shape with the center of the flange portion (1300) into which the piston rod (1230) is inserted as a reference.

[0098] The first groove portion (1330) is formed in the flange portion (1300) in a ring shape with the center of the flange portion (1300) into which the piston rod (1230) is inserted as a reference. Figure 1 The first groove portion (1330) is formed in the flange portion (1300) in a ring shape with the center of the flange portion (1300) into which the piston rod (1230) is inserted as a reference.

[0099] Therefore, the first ring portion (1510) can protrude from the one face of the flange portion (1300) in which the first groove portion (1330) is formed in the state in which the first ring portion (1510) is seated in the first groove portion (1330).

[0100] The first ring portion (1510) is formed in a ring shape and can be formed of the same material as the O-ring (1253) and can be formed of an elastically deformable rubber material, a resin material, an acrylonitrile-butadiene rubber (NBR) material, a metal material, or the like. The first ring portion (1510) has an effect of preventing fluid from flowing out from between the flange portion (1300) and the gas seal (1600).

[0101] Referring to Figure 2 to Figure 5 , the sealant (1400, 1401) according to an embodiment of the present application can be disposed between the flange portion (1300) and the one face of the main shaft portion (1100), specifically, the bent portion (1110) facing the flange portion (1300).

[0102] The sealant (1400, 1401) according to an embodiment of the present application is first in a liquid phase and then solidifies, and can prevent fluid from flowing out to the outside by blocking a fluid flow path between the main shaft portion (1100) and the flange portion (1300).

[0103] Referring to Figure 3 , the sealant (1400, 1401) according to an embodiment of the present application can be disposed on the inner circumferential face of the main shaft portion (1100), specifically, the bent portion (1110).

[0104] Referring to Figure 3 , the sealant (1400, 1401) can be disposed on the outside of the flange portion (1300) after the cylinder assembly (1200), the open holder (1700), the gas seal (1600), and the flange portion (1300) are inserted into the main shaft portion (1100). At this time, the sealant (1400, 1401) can be in contact with the inner circumferential face of the main shaft portion (1100), specifically, the bent portion (1110) and the flange portion (1300) at the same time.

[0105] Referring to Figure 2The sealant (1400, 1401) is disposed on the inner circumferential surface of the bent portion (1110) and simultaneously contacts the flange portion (1300), thereby having an effect of blocking the fluid from flowing out through the space formed between the flange portion (1300) and the main shaft portion (1100).

[0106] Referring to Figure 3 FIG. 6 illustrates a state in which the bent portion (1110) of the main shaft portion (1100) is not bent, and the sealant (1400, 1401) is disposed on the inner circumferential surface of the bent portion (1110) to contact the flange portion (1300). Referring to Figure 2 The main shaft portion (1100) is bent around the flange portion (1300) by the inner circumferential surface of the bent portion (1110), and the sealant (1400, 1401) can be disposed between the inner circumferential surface of the bent portion (1110) and the flange portion (1300). As the sealant (1400, 1401) is cured, it has an effect of preventing the fluid from flowing out from between the flange portion (1300) and the main shaft portion (1100).

[0107] Referring to Figure 2 The main shaft portion (1100) is bent around the flange portion (1300) by the inner circumferential surface of the bent portion (1110), and the sealant (1400, 1401) can be disposed between the inner circumferential surface of the bent portion (1110) and the flange portion (1300). As the sealant (1400, 1401) is cured, it has an effect of preventing the fluid from flowing out from between the flange portion (1300) and the main shaft portion (1100).

[0108] Referring to Figure 4 The sealant (1400, 1401) can be disposed between the flange portion (1300) and the main shaft portion (1100) and spaced apart from the gas seal (1600). When the gas is injected in the hydraulic device, high-pressure gas is injected between the piston rod and the flange portion. The gas seal can be pressed based on the injected high-pressure gas.

[0109] At this time, the gas seal formed of rubber can be deformed due to the high-pressure gas injection gas nozzle and the high-pressure gas, and if the sealant is disposed in contact with the gas seal, the gas seal is deformed while pressing the sealant in contact with the gas seal, thereby causing the sealant to be deviated or deformed.

[0110] When the sealant is deviated or deformed, the sealing force of the sealant is lowered, thereby causing the quality of the hydraulic device to be lowered. Thus, the sealant (1400, 1401) according to an embodiment of the present application can be disposed to be spaced apart from the gas seal (1600).

[0111] At this time, the sealant (1400, 1401) is disposed between the inner circumferential surface of the bent portion (1110) and the flange portion (1300), and the sealant is applied between the outer-facing flange portion (1300) and the inner circumferential surface of the bent portion (1110) before the bent portion (1110) is bent. After the sealant is cured, the disposition of the sealant (1400, 1401) can be completed simply by bending the bent portion (1110), and thus the disposition process of the sealant (1400, 1401) can be simplified compared to a case in which the sealant (1400, 1401) is disposed on the inner side of the flange portion (1300). In addition, the sealant (1400, 1401) can be automatically applied along the circumferential portion between the flange portion (1300) and the bent portion (1110) by rotation by rotating the hydraulic device around the piston rod (1230, 1235) while discharging the sealant from the fixed sealant discharge device, and thus the application process of the sealant (1400, 1401) itself can be simplified and the accuracy of the application process can be improved.

[0112] Referring to Figure 4 The upper side of the first ring portion (1510) can be disposed with a metal member (1511). The metal member (1511) can be disposed to cover the first groove portion (1330) in which the first ring portion (1510) is accommodated. The metal member (1511) covers the first groove portion (1330), and thus the first ring portion (1510) can be fixed to the inside of the first groove portion (1330). In addition, the first ring portion (1510) can be disposed to be spaced apart from the gas seal (1600) by the metal member (1511).

[0113] The gas seal (1600) can be formed of a rubber material. For example, the gas seal (1600) can include nitrile-butadiene rubber (NBR). In addition to the gas seal (1600), the first ring portion (1510) can also be formed of a rubber material, for example, can include nitrile-butadiene rubber.

[0114] That is, when the gas seal (1600) and the first ring portion (1510) are disposed in contact with each other, the gas seal (1600) formed of a rubber material having fluidity can not completely cover the first groove portion (1330), and at least a portion of the first ring portion (1510) can be separated to the outside of the first groove portion (1330) through a portion in which the first ring portion (1510) and the gas seal (1600) are in contact with each other, and thus the sealing force of the first ring portion (1510) can be reduced.

[0115] Thus, by arranging the metal member (1511) having rigidity according to an embodiment of the present application to cover the first groove portion (1330), the sealing force of the first ring portion (1510) can be maintained at a certain level. The metal member (1511) can be formed of a cold rolled steel sheet. By the cold rolled steel sheet, the rigidity of the metal member is secured and the position of the first ring portion (1510) is fixed, thereby functioning to seal the leaked gas.

[0116] Referring to Figure 4 , the first groove portion (1330) and the first ring portion (1510) can be arranged at the right end of the metal member (1511). That is, the gas flowing along the movement path (P) can be leaked from between the flange portion (1300) and the metal member (1511), and in this case, the leaked gas passes through the flow space (L) between the metal member (1511) and the flange portion (1300) and meets the first ring portion (1510) in a state of hydraulic descent, thereby improving the sealing force based on the first ring portion (1510). This is the same as the principle of maximizing the vertical flow space of the leaked gas by arranging the sealant (1400, 1401) at the lower end of the flange portion (1300).

[0117] The sealant (1400, 1401) can be arranged at the rounded portion (R) of the flange portion (1330). The corner portion of the flange portion (1330) is formed in a rounded shape (R), thereby easily applying the sealant (1400, 1401) in a liquid phase to the space between the corner portion of the flange portion (1330) and the inner circumferential surface of the bending portion (1110), and even after solidification, the sealant (1400, 1401) is solidified in a shape having a certain depth from the rounded portion of the flange portion (1330) to the portion where the flange portion (1330) and the inner circumferential surface of the bending portion (1110) are in contact, thereby improving the sealing force of the sealant (1400, 1401).

[0118] Referring to Figure 5 , the sealant (1400, 1401) according to an embodiment of the present application can be arranged between the other side (the upper side with Figure 5 as a reference) opposite to the side (the lower side with Figure 5 as a reference) of the flange portion (1300) where the stepped portion (1310) is formed and the inner circumferential surface of the bending portion (1110). The sealant (1400, 1401) is arranged between the upper side (with Figure 5 as a reference) of the flange portion (1300) and the inner circumferential surface of the main shaft portion (1100), specifically the bending portion (1110), thereby the sealant (1400, 1401) can be simultaneously contacted with the gas seal member (1600), the flange portion (1300), and the main shaft portion (1100).

[0119] With the curing of the sealant (1400, 1401), the gap formed between the flange portion (1300), the main shaft portion (1100), and the gas seal (1600) will be filled, having the effect of blocking the outflow of fluid from the gap.

[0120] Referring to Figure 2 to Figure 5 , the gas seal (1600) according to an embodiment of the present application surrounds the piston rod (1230), specifically the rod body (1235), and is arranged between the flange portion (1300) and the cylinder portion (1210). The gas seal (1600) functions to block the inflow and outflow of fluid such as gas between the inside and the outside of the main shaft portion (1100).

[0121] The central portion of the gas seal (1600) is formed with a hole (not shown) through which the piston rod (1230), specifically the rod body (1235), passes, having the effect of reciprocating through the hole. Although not shown in the drawings, the lower surface of the gas seal (1600) facing the flange portion (1300) is coated with a sealant. Figure 2

[0122] Referring to Figure 2 to Figure 5 , the opening holder (1700) according to an embodiment of the present application surrounds the piston rod (1230), specifically the rod body (1235), and is arranged between the gas seal (1600) and the cylinder portion (1210), and covers the opening area of the cylinder portion (1210).

[0123] The opening holder (1700) according to an embodiment of the present application is formed with a hole (not shown) in the center and allows the piston rod (1230) to pass therethrough, having the effect of reciprocating through the hole. The opening holder (1700) can fix the position of the cylinder portion (1210) inside the main shaft portion (1100) and provide a reciprocating path for the piston rod (1230). The aforementioned sealant film (1400L) can be formed to the boundary where the opening holder (1700) contacts the cylinder portion (1210).

[0124] Although not shown in the drawings, the lower surface of the opening holder (1700) facing the cylinder portion (1210) can be coated with a sealant, thus having the effect of preventing the outflow of fluid such as gas from the opening holder (1700) and the inner circumferential surface of the cylinder portion (1210). Figure 2

[0125] Referring to Figure 2 to Figure 5 , the support portion (1800) according to an embodiment of the present application surrounds and is combined with the piston rod (1230), and functions to support the piston rod (1230) in the length direction thereof (the Figure 2 ​​The axle load (in the vertical direction of the reference) may include a cleaning part (1810) and a fixing part (1830).

[0126] The fixing member (1830) according to an embodiment of the present invention may be formed of a spring ring. (See also...) Figure 2 According to an embodiment of the present invention, the support portion (1800) can surround the rod body (1235) and be combined with the piston head (1231). According to an embodiment of the present invention, the cleaning portion (1810) surrounds the piston rod (1230), specifically the rod body (1235), and is combined with the piston head (1231), and has the effect of supporting the central axis load of the piston rod (1230).

[0127] According to an embodiment of the present invention, the fixing member (1830) is engaged with the cleaning part (1810) and snapped into a groove (not indicated in the drawings) formed along the circumference of the piston rod (1230), thereby stably fixing the cleaning part (1810). (See reference numerals) Figure 2 According to an embodiment of the present invention, the drive unit (1900) contacts the pipe support assembly (1250), specifically the valve (1255), and may be disposed on the main shaft (1100). The drive unit (1900) can open and close the fluid flow path by transmitting power to the valve (1255).

[0128] Reference Figure 2 If the user applies pressure by pressing the drive unit (1900), the drive unit (1900) will transmit power to the valve (1255). As the valve (1255) is pressed and moved, the fluid flow path, i.e., the orifice (1252), formed in the pipe support body (1251) can be opened and closed, thereby allowing fluid to move. (See reference...) Figure 2 The fluid moves through the orifice (1252) between multiple chambers formed inside the cylinder (1210), while the piston rod (1230) reciprocates inside the cylinder (1210), thereby adjusting the stroke of the hydraulic device (1000).

[0129] Reference Figure 11 As Figure 2 An enlarged view of part C shows that, according to another embodiment of the present invention, the drive unit (1900) can move in the vertical direction. Unlike the drive unit (1900) of one embodiment that transmits power to the valve (1255), it can be formed by a release arm.

[0130] Reference Figure 11 According to another embodiment of the present invention, the drive part (1900) contacts the valve (1255) and protrudes outward from the main shaft part (1100).

[0131] If the driving portion (1900) is subjected to an external force by a user or the like, the driving portion (1900) presses the valve (1255) to move the valve (1255). If the valve (1255) moves, the fluid flow path, i.e., the orifice (1252), can be opened and closed in the tube holder assembly (1250), specifically, the tube holder body (1251).

[0132] With the movement of the valve (1255), the piston rod (1230) can have a non-movable fixed mode and a movable moving mode in which the piston rod (1230) can reciprocate with respect to the cylinder portion (1210). If the driving portion (1900) does not press the valve (1255) to close the orifice (1252) of the tube holder assembly (1250), specifically, the tube holder body (1251), the fluid cannot flow, and thus the position of the piston rod (1230) can be fixed inside the cylinder portion (1210).

[0133] Hereinafter, a hydraulic device (1000) having a flange portion (1300) according to a second embodiment will be described in Figure 6 to Figure 10

[0134] <Hydraulic device having flange portion according to second embodiment>

[0135] Referring to Figure 6 to Figure 10 , the hydraulic device (1000) according to an embodiment of the present application can include a main shaft portion (1100), a cylinder assembly (1200), a tube holder assembly (1250), a flange portion (1300), a sealant (1400), a first ring portion (1510), a second ring portion (1550), an air seal (1600), an opening holder (1700), a support portion (1800), and a driving portion (1900).

[0136] The flange portion (1300) according to the second embodiment of the present application is formed with a second groove portion (1350) in addition to the first groove portion (1330) formed on the flange portion (1300) according to the first embodiment, and has a predetermined depth along the outer peripheral surface length facing the inner peripheral surface of the main shaft portion (1100). Specifically, the second groove portion (1350) can be formed along the outer peripheral surface length of the flange portion (1300), and is formed with a predetermined depth in the direction of the center axis of the flange portion (1300) from the outer peripheral surface of the flange portion (1300).

[0137] ​The second groove portion (1350) formed on the outer circumferential surface of the flange portion (1300) can be formed with a second ring portion (1550) having a diameter that can be relatively larger than the depth of the second groove portion (1350). Thus, the second ring portion (1550), in a state of being seated in the second groove portion (1350), can protrude toward the inner circumferential surface of the main shaft portion (1100), specifically the bent portion (1110), on the outer circumferential surface of the flange portion (1300) in which the second groove portion (1350) is formed.

[0138] The second ring portion (1550) is formed in a ring shape, can be formed of the same material as the O-ring (1253), and can be formed of an elastically deformable rubber material, a resin material, an acrylonitrile-butadiene rubber (NBR) material, or the like. The second ring portion (1550) has an effect of preventing fluid from flowing out from between the flange portion (1300) and the gas seal (1600).

[0139] Referring to Figure 7 to Figure 9a and Figure 9b , the diameter of the second ring portion (1550) can be relatively larger than that of the first ring portion (1510), but is not limited thereto and can be variously modified, such as being formed with the same diameter or a relatively smaller diameter. Figure 7 to Figure 10 Referring to

[0140] The sealant (1400, 1401) can be disposed between the flange portion (1300) and the one face of the main shaft portion (1100), specifically the bent portion (1110), which faces the flange portion (1300). Figure 7 Figure 8 to Figure 9a and Figure 9b The sealant (1400, 1401) can be disposed in contact with the second ring portion (1550). Specifically, the sealant (1400, 1401) can be disposed in contact with the second ring portion (1550), the inner circumferential surface of the main shaft portion (1100), specifically the bent portion (1110), and the flange portion (1300) at the same time.

[0141] Referring to Figure 7 to Figure 9a and Figure 9b Since the sealant (1400, 1401) is in contact with the second ring portion (1550), the flange portion (1300), and the inner circumferential surface of the main shaft portion (1100), specifically the bent portion (1110), at the same time, it has an effect of blocking fluid such as gas from flowing out to the outside through a gap formed between the flange portion (1300) and the inner circumferential surface of the bent portion (1110). ​

[0142] With reference to Figure 8 , the sealant (1400, 1401) can be arranged in contact with the lower side (with reference to the Figure 8 , or, as Figure 9a and Figure 9b , in contact with the upper side (with reference to the Figure 8 , of the second ring portion (1550), and can be implemented in various variations, for example, capable of blocking the outflow of a fluid such as gas from the gap formed between the flange portion (1300) and the main shaft portion (1100).

[0143] With reference to Figure 7 to Figure 9a and Figure 9b , the inner peripheral surface of the bent portion (1110) and the flange portion (1300) can be arranged in a ring shape in contact with the second ring portion (1550) with reference to the lengthwise central axis of the main shaft portion (1100), and thus can effectively prevent the outflow of a fluid such as gas from between the flange portion (1300) and the main shaft portion (1100).

[0144] With reference to Figure 9a and Figure 9b , Figure 9a In contrast to the case where the sealant (1400, 1401) is arranged on the lower side of the second ring portion (1550), Figure 8 the difference is that the sealant (1400, 1401) is arranged on the upper side of the second ring portion (1550), Figure 9b and Figure 9a the difference is that the second groove portion (1350) is arranged at a position farther from the stepped portion (1310), and the sealant (1400, 1401) is arranged in a ring shape in contact with the flange portion (1300), the gas seal member (1600), the inner peripheral surface of the main shaft, and the second ring portion (1550).

[0145] With reference to Figure 10 , the sealant (1400, 1401) can be applied in a ring shape along the circumference between the stepped portion (1310) and the end portion of the main shaft portion (1100) facing it, and thus has an effect of preventing the outflow of a fluid from between the main shaft portion (1100) and the flange portion (1300).

[0146] With reference to Figure 7 to Figure 10For the hydraulic device (1000), a second groove portion (1350) is formed on the flange portion (1300) according to the second embodiment of the present application, the second groove portion (1350) is arranged with a second ring portion (1550) and is in contact with the inner circumferential surface of the main shaft portion (1100), and other than this, the structure, working principle and effects are the same as the main shaft portion (1100), the cylinder assembly (1200), the sealant (1400), the first ring portion (1510), the gas seal (1600), the opening support (1700), the support portion (1800) and the driving portion (1900) of the hydraulic device (1000) having the flange portion (1300) according to the first embodiment of the present application, and thus the repeated description is omitted.

[0147] Next, the hydraulic device (1000) according to another embodiment of the present application is described. Figure 12 is a front sectional view of a hydraulic device according to another embodiment of the present application. Figure 13 is Figure 12 is an enlarged view of portion D of

[0148] Referring to Figure 12 and Figure 13 , the hydraulic device (1000) according to another embodiment of the present application can include a housing (10), a guide (20), a bushing (30), a sleeve (40), a main shaft portion (1100), a cylinder assembly (1200), a flange portion (1300), a sealant (1400, 1401, 1402), a first ring portion (1510), a second ring portion, a gas seal (1600), an opening support (1700) and a support portion (1800).

[0149] Referring to Figure 12 , the cylinder assembly (1200), specifically the other end portion (lower end portion with reference to Figure 12 ) opposite to the one end portion (upper end portion with reference to Figure 12 ) of the piston rod (1230) inserted into the inside of the main shaft portion (1100), can be combined with and fixed in position to the housing (10).

[0150] Referring to Figure 12 , the inside of the housing (10) is formed in a hollow shape, and can be used to fix the position of the lower end portion of the piston rod (1230) of the cylinder assembly (1200) and is combined therewith. Referring to Figure 12 , the sleeve (40) can be combined on the outer circumferential surface of the main shaft portion (1100) according to an embodiment of the present application. The sleeve (40) is formed in a hollow tube shape, and can be formed in a shape corresponding to the shape of the outer circumferential surface of the main shaft portion (1100).

[0151] The sleeve (40) according to an embodiment of the present application can increase the stroke of the hydraulic device (1000), and has an effect of increasing the rigidity of the spindle portion (1100) by stably moving the spindle portion (1100) together with the sleeve (40).

[0152] Referring to Figure 12 , the bushing (30) according to an embodiment of the present application is in contact with the sleeve (40), and in particular, the inner circumferential surface of the bushing (30) is in contact with the outer circumferential surface of the sleeve (40). The bushing (30) provides a movement path to the sleeve (40), and thus has an effect of stably supporting the sleeve (40) and the spindle portion (1100) combined with the sleeve (40).

[0153] Referring to Figure 12 , the guide (20) according to an embodiment of the present application is combined with the inner circumferential surface of the housing (10) and is used to fix the position, and the inner circumferential surface of the guide (20) can be combined with the outer circumferential surface of the bushing (30) through other fastening members (not marked with reference numerals). The guide (20) according to an embodiment of the present application can stably fix the position of the bushing (30), and can provide a path for the sleeve (40), the spindle portion (1100), and the cylinder portion (1210) to stably move along the center axis on the inside of the bushing (30).

[0154] The guide (20) according to an embodiment of the present application is formed of a plastic material, but is not limited thereto, and can be implemented in various materials within the technical idea of stably fixing the position of the bushing (30).

[0155] Referring to Figure 12 and Figure 13 , the hydraulic device (1000) according to another embodiment of the present application, in which the pipe holder assembly (1250) and in particular the valve (1255) can protrude to the outside of the spindle portion (1100), is different from the hydraulic device (1000) according to an embodiment of the present application in that the driving portion (1900) for transmitting power to the valve (1255) is not provided.

[0156] In other words, the user can press the valve (1255) by directly applying pressure to the valve (1255), and as pressure is applied to the valve (1255), has an effect of opening and closing the orifice (1252) formed in the pipe holder body (1251).

[0157] Referring to Figure 13 , the pipe holder body (1251) according to an embodiment of the present application can be coated with a sealant (1400, 1402) between the inner circumferential surface of the spindle portion (1100). The sealant (1400, 1402) can be arranged in a ring shape along the inner circumferential surface of the spindle portion (1100) in contact with the upper end portion (of the pipe holder body (1251). Figure 13 )

[0158] Therefore, it has an effect of being able to block the outflow of fluid such as gas from between the pipe holder body (1251) and the inner circumferential surface of the main shaft portion (1100).

[0159] The hydraulic device (1000) according to another embodiment of the present application has the same structure, working principle and effects as the hydraulic device (1000) according to the first embodiment, except that the driving portion (1900) for transmitting power to the valve (1255) is not necessarily provided in the pipe holder assembly (1250). Figure 7 The main shaft portion (1100), the cylinder assembly (1200), the flange portion (1300), the sealant (1400, 1401 and 1402), the first ring portion (1510), Figure 7 The second ring portion (1550), the gas seal (1600), the opening holder (1700), The support portion (1800) and the driving portion in the hydraulic device (1000) according to the second embodiment have the same structure, working principle and effects as the support portion (1800) and the driving portion in the hydraulic device (1000) according to the first embodiment, and thus repeated description thereof is omitted.

[0160] Figure 12 In addition, the flange portion (1300) according to the first embodiment is illustrated in the hydraulic device (1000) according to the second embodiment, but is not limited thereto, and can be implemented in various modifications, for example, the flange portion (1300) according to the second embodiment can be used, which can arrange the second ring portion (1550) by forming the second groove portion (1350).

[0161] Hereinafter, a hydraulic device according to still another embodiment of the present application will be described. Figure 14 And Figure 15 are enlarged views of parts of the hydraulic device according to still another embodiment of the present application. Referring to Figure 14 And Figure 15 The hydraulic device can include a main shaft portion (1100), a cylinder assembly (1200), a flange portion (1300), a sealant (1400), a first ring portion (1510), a second ring portion (1550), a gas seal (1600), an opening holder (1700), a support portion (1800) and a driving portion.

[0162] Figure 14 And Figure 15 As enlarged views of a region portion for providing the flange portion (1300) in the hydraulic device (1000), specifically, Figure 14 Corresponding Figure 2 to the A region for providing the flange portion (1300) according to the first embodiment in Figure 15 Corresponding Figure 7 to the B region for providing the flange portion (1300) according to the second embodiment in

[0163] In addition, Figure 12 to a lower end region of the main shaft portion (1100) for providing the flange portion (1300). Referring toFigure 14 The main shaft portion (1100) is formed to be hollow inside, and a protrusion (1130) is formed at the entrance of the main shaft portion (1100) to protrude toward the central axis of the length direction of the main shaft portion (1100).

[0164] Specifically, the main shaft portion (1100) is inserted with a cylinder assembly (1200), an opening holder (1700), an air seal (1600), and a flange portion (1300) combined with a first ring portion (1510), and a protrusion (1130) is formed to protrude toward the central axis of the length direction of the main shaft portion (1100) on the inner circumferential surface of the main shaft portion (1100) on the outer side, specifically the lower side (with reference to Figure 14 the flange portion (1300) and the inner circumferential surface of the main shaft portion (1100) for forming the protrusion (1130).

[0165] Referring to Figure 14 , a sealant (1400, 1401) can be arranged between the inner circumferential surface of the main shaft portion (1100) for forming the protrusion (1130) and the flange portion (1300). Referring to Figure 14 , the protrusion (1130) according to an embodiment of the present application is arranged on the movement path of the flange portion (1300), thereby preventing the flange portion (1300) inserted inside the main shaft portion (1100) from being detached.

[0166] Further, by arranging a sealant (1400, 1401) between the inner circumferential surface of the lower area (with reference to Figure 14 the main shaft portion (1100) for forming the protrusion (1130) and the flange portion (1300), there is an effect of blocking fluid from flowing outward.

[0167] Referring to Figure 14 , a cleaning member (W) can be arranged between the protrusion (1130) formed on the main shaft portion (1100) and the flange portion (1300). At this time, the sealant (1400, 1401) can be arranged to contact the inner circumferential surface of the main shaft portion (1100), the flange portion (1300), and the cleaning member (W) at the same time.

[0168] Referring to Figure 14 and Figure 15 , the protrusion (1130) protruding from the inner circumferential surface of the main shaft portion (1100) is formed by pushing a predetermined area of the outer circumferential surface of the main shaft portion (1100) extending in the upward and downward direction (with reference to Figure 14 ) toward the central axis direction, thereby being formed to protrude toward the piston rod (1230) on the inner circumferential surface.

[0169] However, it is not limited thereto, and the protrusion (1130) can be implemented in various modifications, for example, along the upward and downward direction (with reference to Figure 14The inner circumferential surface of the main shaft portion (1100) formed by the extension of the flange portion (1300) is integrally combined to protrude toward the piston rod (1230).

[0170] Figure 15 The flange portion (1300) according to the second embodiment is arranged inside the main shaft portion (1100) in the hydraulic device (1000) according to the third embodiment. Figure 14 The flange portion (1300) according to the first embodiment is arranged and a protruding portion (1130) protruding toward the center axis of the length direction of the main shaft portion (1100) is formed at the entrance of the main shaft portion (1100) in the hydraulic device (2000) according to the fourth embodiment. Therefore, the repeated description of the structure of the protruding portion (1130) can be omitted.

[0171] Figure 14 The flange portion (1300) according to the first embodiment is arranged and a protruding portion (1130) protruding toward the center axis of the length direction of the main shaft portion (1100) is formed at the entrance of the main shaft portion (1100) in the hydraulic device (2000) according to the fourth embodiment. Therefore, the repeated description of the structure of the protruding portion (1130) can be omitted. Figure 15 The bending portion (1110) shown in Figure 2 、 Figure 7 and Figure 12 is not formed. Instead, a protruding portion (1130) is protrudingly formed on the main shaft portion (1100) and, except that the sealant (1400, 1401) is arranged between the inner circumferential surface of the main shaft portion (1100) in which the protruding portion (1130) is formed and the outer circumferential surface of the flange portion (1300), the other structures, working principles and effects of the hydraulic device (1000) shown in Figure 1 to Figure 13 are the same. Therefore, the detailed description thereof is omitted.

[0172] Next, the hydraulic device (2000) according to still another embodiment of the present application will be described. Figure 16 is a front cross-sectional view of the hydraulic device according to still another embodiment of the present application. Figure 17 is an enlarged view of the E portion of Figure 16 .

[0173] Referring to Figure 16 and Figure 17 , the hydraulic device (2000) according to still another embodiment of the present application is a hydraulic device (2000) using a gas spring method, unlike the cylinder-type hydraulic device (1000) illustrated in Figure 2 、 Figure 7 and Figure 12 .

[0174] Referring to Figure 16 and Figure 17 , the hydraulic device (2000) according to still another embodiment of the present application can include an outer cylinder (2100), an inner cylinder (2200), a piston assembly (2300), a free piston (2400), a flange portion (2500), sealants (2600, 2601 and 2602), a gas seal (2700), an opening holder (2800) and a cover portion (2900). Referring to Figure 16The outer cylinder (2100) is formed as a hollow tube, which provides space for accommodating internal mechanical components, compressed gases such as nitrogen, and liquids such as oil.

[0175] Reference Figure 16 One end of the outer cylinder block (2100) (with Figure 16 The upper end of the inner cylinder (2200) can be inserted with a cover (2900), specifically an outer cover (2930), which will be described later, and thus cover the outer cylinder (2100). The inner cylinder (2200) shares a central axis with the outer cylinder (2100) and can be arranged inside the outer cylinder (2100).

[0176] Reference Figure 16 One end of the internal cylinder (2200) (with Figure 16 The upper end of the inner cylinder (2200) can be inserted into the covered portion (2900), specifically the inner cover (2910), and thereby cover the inner cylinder (2200). A portion of the inner cover (2910) can be inserted into one end of the inner cylinder (2200). Figure 16 The inner side of the upper end (based on the reference).

[0177] Reference Figure 16 and Figure 17 The inner cover (2910) may include an O-ring (2911) for frictional engagement and sealing with the inner cylinder (2200). Thus, one end of the inner cylinder (2200) may be... Figure 16 The upper end of the inner cylinder (2200) is sealed to prevent the fluid contained in the inner cylinder from leaking to the outside.

[0178] Reference Figure 17 In addition to the O-ring (2911), sealant (2600, 2602) can also be applied between the inner circumferential surface of the inner cylinder (2200) and the outer circumferential surface of the inner cover (2910).

[0179] The sealant (2600, 2602) is placed between the inner cover (2910) and the inner circumferential surface of the inner cylinder (2200), initially as a liquid phase and then solidified, thereby having the effect of further preventing the fluid contained in the inner cylinder (2200) from flowing out to the outside, based on the O-ring (2911).

[0180] Reference Figure 16 The piston rod (2310) assembly is used to insert into the interior of the internal cylinder (2200) and may include the piston rod (2310) and the piston valve (2330).

[0181] Reference Figure 16 The other end (to) opposite one end of the inner cylinder (2200) used for inserting the inner cover (2910) Figure 16The lower end of the reference (i.e., the lower end of the lower end of the reference) is open, and the piston rod (2310) can be inserted into the open interior cylinder (2200) and reciprocally move on the inside of the interior cylinder (2200). Referring to Figure 16 The piston rod (2310) can include a rod body (2311), a piston head (2313), and an O-ring (2315).

[0182] The rod body (2311) is formed to extend along the central axis of the outer cylinder (2100) and the interior cylinder (2200) and is inserted into the interior cylinder (2200), and the piston head (2313) can be connected to the rod body (2311) and in contact with the inner circumferential surface of the interior cylinder (2200).

[0183] The piston head (2313) can be connected to the O-ring (2315), and thus can block the flow of fluid formed in the space between the piston head (2313) and the inner circumferential surface of the interior cylinder (2200). Referring to Figure 16 The piston valve (2330) is combined with the piston rod (2310), specifically the piston head (2313), and serves to open and close the fluid flow path between the outer cylinder (2100) and the interior cylinder (2200), and can be connected to the driving portion (2350) described below.

[0184] The driving portion (2350) is disposed at the center of the piston rod (2310) and is connected to the piston valve (2330), and when pressure is applied to the driving portion (2350) from the outside by a user or the like, the piston valve (2330) moves to make it possible for fluid to flow in and out through the fluid flow path.

[0185] The piston rod (2310) can have a fixed mode in which it does not move and a moving mode in which it moves, according to the opening or closing of the piston valve (2330). In the moving mode, the piston rod (2310) can reciprocally move with respect to the interior cylinder (2200).

[0186] Referring to Figure 16 The free piston (2400) is disposed in the space between the outer cylinder (2100) and the interior cylinder (2200) and can divide the space between the outer cylinder (2100) and the interior cylinder (2200) and move to be close to the inner circumferential surface of the outer cylinder (2100) and the outer circumferential surface of the interior cylinder (2200), respectively.

[0187] The free piston (2400) can include an O-ring (not marked with a reference numeral) in contact with the outer cylinder (2100) and an O-ring (not marked with a reference numeral) in contact with the interior cylinder (2200).

[0188] The O-ring can block the flow of fluid through the gap between the free piston (2400) and the outer cylinder (2100), and the gap between the free piston (2400) and the inner cylinder (2200). According to the pressure acting on the free piston (2400), the volumes of the spaces divided between the outer cylinder (2100) and the inner cylinder (2200) can be changed, and the stroke of the hydraulic device (2000) can be adjusted.

[0189] Referring to Figure 16 In the hydraulic device (2000) according to the still another embodiment of the present application, the flange portion (2500) surrounds the piston rod (2310) and is disposed at the inlet side of the outer cylinder (2100) so as to be in contact with the inner circumferential surface of the outer cylinder (2100).

[0190] One end portion (the lower end portion with respect to the Figure 16 The outer cylinder (2100) can be formed with a bent portion (2110) surrounding the flange portion (2500) and bent at the one end portion (the lower end portion with respect to the

[0191] That is, the sealant (2600, 2601) can be disposed between the flange portion (2500) and the one face of the bent portion (2110) facing the flange portion (2500).

[0192] The flange portion (2500) in the hydraulic device (2000) according to the still another embodiment of the present application has the same structure, working principle and effects as the flange portion (1300) according to the first and second embodiments in the hydraulic device (1000) according to the gas cylinder method, except that it is applied to the hydraulic device (2000) according to the gas spring method. The sealant (2600, 2601) between the flange portion (2500) and the outer cylinder (2100) can be disposed in the same manner as the sealant (1400, 1401) in the hydraulic device (1000) according to the embodiment of the present application.

[0193] Further, the gas seal (2700) and the opening holder (2800) in the hydraulic device (2000) according to the still another embodiment of the present application are the same as the gas seal (1600) and the opening holder (1700) in the hydraulic device (1000) according to the embodiment of the present application, and thus the detailed description thereof is omitted.

[0194] Further, although not shown in the drawings, the main shaft portion (2100) in the hydraulic device (2000) according to the still another embodiment of the present application is not formed with the bent portion (2110), but instead, for example, Figure 14 and Figure 15A protrusion is formed protruding toward a center axis of the length direction of the spindle portion (2100) at the entrance of the spindle portion (2100) provided with the flange portion (2500), and a sealant (2600, 2601) can be arranged between the inner peripheral surface of the spindle portion (2100) on which the protrusion is formed and the outer peripheral surface of the flange portion (2500), and detailed description related thereto is as described above, and thus detailed description thereof is omitted.

[0195] The specific embodiments described in the present application are provided as an example, and do not limit the scope of the present application in any way. For the sake of simplicity of the description, the description of existing electronic components, control systems, software, and other functional aspects of the system can be omitted. In addition, the line connections or connecting members between the constituent elements illustrated in the drawings are used to exemplarily represent functional connections and / or physical or circuit connections, and various functional connections, physical connections, or circuit connections that can be replaced or added can be represented in the actual device. In addition, if not specifically mentioned as "essential", "important", or the like, it can not be an essential constituent element for implementing the present application.

[0196] Therefore, the idea of the present application is not limited to the foregoing embodiments, and all the scope of the claims described below and equivalent or equivalent modifications thereof are within the scope of the idea of the present application.

[0197] Industrial applicability

[0198] The present application relates to a hydraulic device, and embodiments of the present application can be applied to an industrially usable table, a workbench, a dining table, or a height-adjustable desk, a chair, or the like.

Claims

1. A hydraulic device, comprising: The main shaft section is hollow inside; A cylinder assembly, comprising a hollow cylinder portion and a piston rod reciprocating inside the cylinder portion, and inserted through an inlet in the main shaft portion; A flange portion, which surrounds the piston rod, is arranged on the inlet side of the cylinder portion and contacts the inner circumferential surface of the main shaft portion; A sealant is disposed between the flange portion and a bent portion facing the flange portion, the bent portion being bent around the flange portion at the entrance of the main shaft portion. The sealant is initially a liquid phase, a semi-liquid phase, or a solid phase, and then cured. A first groove is formed on one side of the flange portion, which is parallel to the central axis of the piston rod along its outer perimeter and has a predetermined depth, centered on the piston rod. The sealant further includes a first ring portion, which is formed in a ring shape and disposed in the first groove portion. The first ring portion is formed of a rubber material or a resin material. A metal part covers the first groove, thereby fixing the first ring inside the first groove. as well as An airtight seal is provided, wherein the first ring portion is separated from the airtight seal by the metal component, the airtight seal is formed of rubber material, and the first groove portion and the first ring portion are arranged at one end of the metal component near the piston rod.

2. The hydraulic device as described in claim 1, characterized in that: The flange has a stepped section with different diameters along its central axis along the length of the piston rod.

3. The hydraulic device as described in claim 2, characterized in that: The sealant is applied to the inner circumferential surface of the bend.

4. The hydraulic device as described in claim 2, characterized in that: The sealant is disposed between the end of the bend facing the piston rod and the outer peripheral surface of the step portion formed in the flange.

5. The hydraulic device as described in claim 2, characterized in that: The sealant is disposed between the side opposite to the flange portion on which the step portion is formed and the inner circumferential surface of the bend portion.

6. The hydraulic device as described in claim 1, characterized in that: The flange portion has a second groove portion formed thereon, which has a predetermined depth along the circumference of the outer peripheral surface facing the inner peripheral surface of the main shaft portion; it further includes a second ring portion, which is arranged in the second groove portion and contacts the inner peripheral surface of the main shaft portion.

7. The hydraulic device as described in claim 6, characterized in that: The second ring is formed of rubber or resin material.

8. The hydraulic device as described in claim 1, characterized in that: The gas seal surrounds the piston rod and is arranged between the flange portion and the cylinder body portion.

9. The hydraulic device as described in claim 8, characterized in that: It further includes an opening support surrounding the piston rod and disposed between the gas seal and the cylinder portion for covering the cylinder portion.

10. The hydraulic device as described in claim 9, characterized in that: It further includes a support portion surrounding and connected to the piston rod for supporting the load of the piston rod.

11. The hydraulic device as claimed in claim 1, characterized in that: The cylinder assembly further includes a pipe support assembly disposed on the opposite side of the main shaft portion on which the flange portion is disposed, coupled to one end of the cylinder portion, and including a valve for opening and closing the fluid flow path.

12. The hydraulic device as described in claim 11, characterized in that: It further includes a drive unit, which is connected to the valve and disposed on the main shaft, and opens and closes the flow path of fluid by transmitting power to the valve.

13. A hydraulic device, comprising: The main shaft section is hollow inside; A cylinder assembly, comprising a hollow cylinder portion and a piston rod reciprocating within the cylinder portion, and inserted through an inlet in the main shaft portion; A flange portion, which surrounds the piston rod, is arranged on the inlet side of the cylinder portion and contacts the inner circumferential surface of the main shaft portion; A first sealant is disposed between the flange portion and a bent portion facing the flange portion, the bent portion being bent around the flange portion at the entrance of the spindle portion. At least a portion of the inner surface of the main shaft is rubbed with a second sealant to form a sealant film. The sealant is initially a liquid phase, a semi-liquid phase, or a solid phase, and then cured. A first groove is formed on one side of the flange, which is parallel to the central axis of the piston rod along its outer perimeter and has a predetermined depth, centered on the piston rod. The groove further includes a first ring, which is formed in a ring shape and arranged in the first groove. The first ring is formed of rubber material or resin material. A metal part covers the first groove, thereby fixing the first ring inside the first groove. as well as An airtight seal is provided, wherein the first ring portion is separated from the airtight seal by the metal component, the airtight seal is formed of rubber material, and the first groove portion and the first ring portion are arranged at one end of the metal component near the piston rod.

14. A hydraulic device, comprising: External cylinder block; An inner cylinder that shares a central axis with the outer cylinder and is located inside the outer cylinder; A piston rod assembly includes a piston rod reciprocating within the inner cylinder; and a piston valve disposed on the piston rod and providing a fluid flow path between the outer cylinder and the inner cylinder. A free piston is used to divide the space between the outer cylinder and the inner cylinder, and can move in contact with the inner circumferential surface of the outer cylinder and the outer circumferential surface of the inner cylinder, respectively. A flange portion, which surrounds the piston rod, is arranged on the inlet side of the outer cylinder and contacts the inner circumferential surface of the outer cylinder; A sealant is disposed between the flange portion and a bent portion facing the flange portion, the bent portion being bent around the flange portion at the inlet of the outer cylinder body. The sealant is initially a liquid phase, a semi-liquid phase, or a solid phase, and then cured. A first groove is formed on one side of the flange portion, which is parallel to the central axis of the piston rod along its outer perimeter and has a predetermined depth, centered on the piston rod. The sealant further includes a first ring portion, which is formed in a ring shape and disposed in the first groove portion. The first ring portion is formed of a rubber material or a resin material. A metal part covers the first groove, thereby fixing the first ring inside the first groove. as well as An airtight seal is provided, wherein the first ring portion is separated from the airtight seal by the metal component, the airtight seal is formed of rubber material, and the first groove portion and the first ring portion are arranged at one end of the metal component near the piston rod.

15. The hydraulic device as described in claim 14, characterized in that: The sealant is initially a liquid phase, and then it solidifies.

16. The hydraulic device as described in claim 15, characterized in that: The flange has a stepped section with different diameters along its central axis along the length of the piston rod.

17. A hydraulic device, comprising: The main shaft section is hollow inside; A cylinder assembly, comprising a hollow cylinder portion and a piston rod reciprocating inside the cylinder portion, and inserted through an inlet in the main shaft portion; A flange portion, which surrounds the piston rod, is arranged on the inlet side of the cylinder portion and contacts the inner circumferential surface of the main shaft portion; A sealant is disposed between the inner circumferential surface of the spindle portion with the protrusion and the outer circumferential surface of the flange portion. The protrusion is formed at the entrance of the spindle portion protruding towards the central axis of the spindle portion along its length. The sealant is initially a liquid phase, a semi-liquid phase, or a solid phase, and then cured. A first groove is formed on one side of the flange portion, which is parallel to the central axis of the piston rod along its outer circumference and has a predetermined depth, centered on the piston rod. The flange portion further includes a first ring portion, which is formed in a ring shape and disposed in the first groove portion. The first ring portion is formed of rubber material or resin material. A metal part covers the first groove, thereby fixing the first ring inside the first groove. as well as An airtight seal is provided, wherein the first ring portion is separated from the airtight seal by the metal component, the airtight seal is formed of rubber material, and the first groove portion and the first ring portion are arranged at one end of the metal component near the piston rod.

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