KR20170017339A

KR20170017339A - Hydraulic cylinder using piston with shock absorbing member

Info

Publication number: KR20170017339A
Application number: KR1020150111104A
Authority: KR
Inventors: 서문원
Original assignee: 서문원
Priority date: 2015-08-06
Filing date: 2015-08-06
Publication date: 2017-02-15
Also published as: KR101788388B1

Abstract

The present invention relates to a hydraulic cylinder with a buffer member embedded in a piston, and an operating method thereof. More specifically, the hydraulic cylinder includes: a cylinder tube including an inlet taking or discharging working fluids, a closed surface on a side, an opened surface on the other side, and an inner chamber forming an inner space; a piston formed with the same diameter in a longitudinal direction, and embedded in the inner chamber of the tube to be operated depending on whether the working fluids flow in or out; and a buffer member embedded in an insertion groove formed on a side of the piston to absorb impact and vibration, caused on the piston by the working fluids, by being compressed in accordance with pressure of the working fluids.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic cylinder having a shock absorbing member mounted in a piston,

The present invention relates to a hydraulic cylinder in which a buffer member is mounted in a piston, and a method of operating the hydraulic cylinder.

The hydraulic cylinder is a device that performs mechanical work by linearly moving the piston or the plunger reciprocating by the hydraulic pressure. In addition, when pressure is applied to the cylinder through the solenoid valve due to the pressure from the hydraulic pump, it corresponds to a device that moves the body by the force.

Fig. 1A shows a side view of a conventional hydraulic cylinder 1, and Figs. 1B and 1C show photographs of a conventional hydraulic cylinder 1 of various sizes. 1D is a side view of a hydraulic pump 2 that provides power for introducing a working fluid into a conventional hydraulic cylinder 1, and FIG. 1E is a view showing a pressure of a working fluid flowing into a conventional hydraulic cylinder 1 Fig. 2 is a cross-sectional view of a solenoid valve 3 for controlling the solenoid valve 3;

Further, the hydraulic cylinder 1 is applied to a place where vertical and lateral movements are required, and is widely applied to a dental unit chair 6, operating table, MRI, and industrial equipment. 2 shows a perspective view of a dental unit chair 6 to which a conventional hydraulic cylinder 1 is applied.

FIG. 3 is a perspective view of a conventional hydraulic cylinder 1, FIG. 4 is a perspective view of a broken portion of a conventional hydraulic cylinder 1, and FIG. 5a is a sectional view of a conventional hydraulic cylinder 1 .

5A, a conventional hydraulic cylinder 1 includes a cylinder tube 10 having a first inlet 13-1 formed on one outer surface and a second inlet 13-2 formed on the other outer surface, A piston 20 which is mounted in the tube 10 and is moved by the introduced working fluid 7; a piston rod 30 which is coupled to the piston 20 and serves as a shaft for driving the piston 20; A cover 8 coupled to the inside of the other side of the cylinder tube 10 to guide the rod 30, a mounting portion (bushing 5) provided at one side of the cylinder tube 10 and at the exposed end of the piston rod 30 As shown in FIG.

5 (a), the piston 20 is mounted in the cylinder tube 10. The piston 10 is fixed to the piston rod 30 by a fastening member such as a bolt And the cover 8 is engaged in the cylinder tube 10 to guide the movement of the piston rod 30. [

5B is a cross-sectional view of a conventional hydraulic cylinder 1 in a state in which the working fluid 7 flows through the first inlet 13-1. 5C is a cross-sectional view of the conventional hydraulic cylinder 1 in a state in which the working fluid 7 flows through the second inlet 13-2. 5B, when the working fluid 7 is introduced through the first inlet 13-1, the piston 20, the piston rod 30, and the mounting portion of the piston rod 30, which are mounted on the piston rod 30, When the working fluid 7 is to be introduced through the second inlet 13-2 as shown in Fig. 5C, the piston 20, the piston rod 30 And the mounting portion 5 mounted on the piston rod 30 are moved integrally to the left.

In this conventional hydraulic cylinder 1, the piston 20 and the piston rod 30 are formed of separate members, and a member for fastening the piston 20 is separately required. A cover 8 for guiding the movement of the piston rod 30 is separately provided There is a problem that it must be mounted on the cylinder tube 10.

In order to prevent the leakage of the working fluid 7, the gap between the piston 20 and the piston rod 30, between the piston 20 and the inner surface of the cylinder tube 10, between the cover 8 and the piston rod 30 And a sealing member 4 such as an O-ring is inserted between the cover 8 and the cylinder tube 10.

Since the working fluid 7 suddenly flows into the piston 20 at a predetermined pressure to apply an instantaneous pressure to the piston 20, an impact is applied to the piston 20, and the hydraulic cylinder 1 itself vibrates There is a problem that not only the noise can be generated but also noise is generated.

The conventional hydraulic cylinder 1 fixes the gap between the piston rod 30 and the cylinder tube 10 with the sealing member 4 in order to maintain the horizontality (straightness) between the piston rod 30 and the cylinder tube 10. The conventional hydraulic cylinder 1 Since the sealing member 4 of the piston rod 30 maintains the horizontalness only, it does not stick to the left and right (or up and down), so that it is poorly assembled and a clearance is generated.

In the conventional hydraulic cylinder 1, the air introduced between the piston 20 and the piston rod 30 is compressed by the movement of the piston 20 and escapes into the gap to generate noise and vibration .

Since the outer diameter of the piston sealing member 4 is larger than that of the piston 20, resistance of the outer diameter of the sealing member 4 is generated as the piston 20 moves up and down or left and right.

Korea Patent No. 1373716

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a piston and a piston rod, Such a packing is a resilient material such as a rubber material, which prevents the oil in the tube from escaping from the outside, has a space in the inner diameter of the cylinder tube, And a method of operating the hydraulic cylinder.

According to an embodiment of the present invention, a piston acting as a damper is mounted on a cushioning member having an elastic force, and when a working fluid flows into an inlet, a piston in a rod shape is moved in a transverse direction, A hydraulic cylinder is mounted in a piston in which a working fluid is introduced into the piston to compress the buffer member so that a force applied to the piston by the working fluid instantaneously can relieve an impact at the portion, and a method of operating the hydraulic cylinder is provided .

According to an embodiment of the present invention, the piston and the piston rod are integrated so that the straightness is prevented from being shifted, and a stable structure is obtained. Thus, And a method for operating the cylinder and the hydraulic cylinder.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. It can be understood.

An object of the present invention is to provide a hydraulic cylinder comprising: a cylinder tube including an inlet for introducing and discharging a working fluid, a closed surface provided on one side, an opening provided on the other side, and an inner chamber forming an inner space; A piston mounted on an inner chamber of the cylinder tube and operated according to the inflow and discharge of a working fluid flowing through the inlet; And a buffer member mounted on an insertion groove formed on a side surface of the piston, the buffer member being compressed according to a pressure of the introduced working fluid to absorb shock and vibration of the piston due to the working fluid. As a hydraulic cylinder in which a buffer member is mounted.

Further, the inner surface of the inner chamber has a guide surface that is shaped like an outer surface of the piston and guides the movement of the piston.

In addition, a mounting groove is formed in the guide surface, and at least one packing for preventing leakage of the working fluid due to the movement of the piston is provided in the mounting groove.

The cushioning member may have a spherical shape having a plurality of elastic forces.

The mounting groove may have a leak storage space in which the leaked working fluid is stored in accordance with the movement of the piston when the packing is inserted.

In addition, the end surface of the packing may have a concave shape from the outside to the inside, and the working fluid leaking according to the movement of the piston may be stored.

The packing closest to the most open side of the plurality of packs may have a leakage preventing protrusion protruded toward the piston so as to be inclined toward the opening side.

As another category, it is an object of the present invention to provide a method of operating a hydraulic cylinder, wherein the hydraulic cylinder includes an inlet port through which a working fluid is introduced and discharged, a closed surface provided on one side, A piston mounted on an inner chamber of the cylinder tube and configured to operate in accordance with the inflow and discharge of a working fluid flowing through the inlet, And a cushioning member which is mounted on an insertion groove formed on one side surface of the cylinder tube and which is compressed in accordance with the pressure of the introduced working fluid to absorb shock and vibration of the piston by the working fluid, Introducing a fluid; Absorbing the shock and vibration while the buffer member mounted in the piston is compressed as the working fluid is introduced; And moving the piston by the working fluid. The method of operating a hydraulic cylinder in which a buffer member is mounted in a piston can be achieved.

In addition, in the step of moving the piston, leakage of the working fluid due to the movement of the piston is prevented by the packing provided in the insertion groove formed in the guide surface of the inner chamber.

According to an embodiment of the present invention, the piston and the piston rod are integrally formed in a cylindrical shape unlike the prior art, and a plurality of packings are assembled in the cylinder tube. The packing is made of elastic material such as rubber material, It is possible to prevent the oil from escaping from the outside and to have a space in the inner diameter of the cylinder tube to save the oil leakage and to prevent oil leakage secondarily.

According to an embodiment of the present invention, a piston acting as a damper is mounted on a cushioning member having an elastic force, and when a working fluid flows into an inlet, a piston in a rod shape is moved in a transverse direction, So that the force applied to the piston by the working fluid instantaneously can relieve the impact at this portion.

According to an embodiment of the present invention, there is an advantage that the piston and the piston rod are integrated to prevent the deviation of the straightness from being deviated, so that the structure is stable and there is no noise or fluctuation caused by shifting (incomplete coupling).

It should be understood, however, that the effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those skilled in the art to which the present invention belongs It will be possible.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, It should not be construed as limited.
1A is a side view of a conventional hydraulic cylinder,
Figs. 1B and 1C show a conventional hydraulic cylinder photograph of various sizes,
1D is a side view of a hydraulic pump that provides power for introducing working fluid into a conventional hydraulic cylinder;
FIG. 1E is a cross-sectional view of a solenoid valve for regulating the pressure of a working fluid flowing into a conventional hydraulic cylinder,
2 is a perspective view of a dental unit chair to which a conventional hydraulic cylinder is applied,
3 is a broken perspective view of a conventional hydraulic cylinder,
4 is a perspective view of a broken portion of a conventional hydraulic cylinder,
5A is a cross-sectional view of a conventional hydraulic cylinder,
FIG. 5B is a cross-sectional view of a conventional hydraulic cylinder in a state in which a working fluid flows through a first inlet,
5C is a cross-sectional view of a conventional hydraulic cylinder in a state in which a working fluid flows through a second inlet,
6 is a sectional view of a hydraulic cylinder in which a buffer member is mounted in a piston according to an embodiment of the present invention,
FIG. 7 is a cross-sectional view of a hydraulic cylinder in which a buffer member is mounted in a piston in a state in which a cushioning member is compressed with a working fluid flowing through an inlet according to an embodiment of the present invention;
FIG. 8 is a cross-sectional view of a hydraulic cylinder in which a buffer member is mounted in a piston in a state in which a piston is moved as an operating fluid flows through an inlet according to an embodiment of the present invention;
Fig. 9 is an enlarged view of a portion A in Fig. 8,
10A is a cross-sectional view of a packing according to an embodiment of the present invention,
FIG. 10B is a sectional view of a packing having an oil leakage protrusion according to an embodiment of the present invention, FIG.
11 is a sectional view of a hydraulic cylinder in which a buffer member is mounted in a piston in a state in which a piston is moved as a working fluid is discharged through an inlet according to an embodiment of the present invention,
Fig. 12 shows an enlarged view of a portion B in Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, and advantages of the present invention will become more readily apparent from the following description of preferred embodiments with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art.

In this specification, when an element is referred to as being on another element, it may be directly formed on another element, or a third element may be interposed therebetween. Also in the figures, the thickness of the components is exaggerated for an effective description of the technical content.

Embodiments described herein will be described with reference to cross-sectional views and / or plan views that are ideal illustrations of the present invention. In the drawings, the thicknesses of the films and regions are exaggerated for an effective description of the technical content. Thus, the shape of the illustrations may be modified by manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention are not limited to the specific forms shown, but also include changes in the shapes that are produced according to the manufacturing process. For example, the etched area shown at right angles may be rounded or may have a shape with a certain curvature. Thus, the regions illustrated in the figures have attributes, and the shapes of the regions illustrated in the figures are intended to illustrate specific forms of regions of the elements and are not intended to limit the scope of the invention. Although the terms first, second, etc. have been used in various embodiments of the present disclosure to describe various components, these components should not be limited by these terms. These terms have only been used to distinguish one component from another. The embodiments described and exemplified herein also include their complementary embodiments.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms "comprises" and / or "comprising" used in the specification do not exclude the presence or addition of one or more other elements.

In describing the specific embodiments below, various specific details have been set forth in order to explain the invention in greater detail and to assist in understanding it. However, it will be appreciated by those skilled in the art that the present invention may be understood by those skilled in the art without departing from such specific details. In some instances, it should be noted that portions of the invention that are not commonly known in the description of the invention and are not significantly related to the invention do not describe confusing reasons to explain the present invention.

Hereinafter, the structure and function of the hydraulic cylinder 100 in which the buffer member 40 is mounted in the piston 20 according to an embodiment of the present invention will be described. 6 is a sectional view of a hydraulic cylinder 100 in which a buffer member 40 is mounted in a piston 20 according to an embodiment of the present invention.

6, a hydraulic cylinder 100 in which a cushioning member 40 is mounted in a piston 20 according to an embodiment of the present invention generally includes a cylinder tube 10 and a rod- 20), it can be seen that it is composed of two members.

6, a cylinder tube 10 of a hydraulic cylinder 100 having a cushioning member 40 mounted in a piston 20 according to an embodiment of the present invention includes a closed side 11, and the other surface is formed as a tube-like shape with an open opening surface 12.

The inner surface of one side of the cylinder tube 10 includes an inner chamber 14 having an inlet 13 through which the working fluid 7 is introduced or discharged and which forms an inner space. The DU bushing 5 is connected to the closed surface 11 of the cylinder tube 10.

The piston 20 of the hydraulic cylinder 100 in which the shock absorbing member 40 is mounted in the piston 20 according to the embodiment of the present invention has the piston 20 and the piston rod 30 Respectively. That is, the piston 20 has a rod shape having the same diameter along the longitudinal direction. The piston 20 is mounted on the inner chamber 14 of the cylinder tube 10 to receive the working fluid 7 flowing through the inlet 13, And linear motion is performed according to discharge.

6, the other end of the piston 20 is exposed to the opening 12 of the cylinder tube 10, and the DU bushing 5 is integrally connected to the exposed end of the piston 20, .

An insertion groove 21 is formed in one side surface of the piston 20 of the hydraulic cylinder 100 in which the buffer member 40 is mounted in the piston 20 according to the embodiment of the present invention, A plurality of cushioning members (not shown) which are mounted in the insertion groove 21 and are compressed according to the pressure of the working fluid 7 to absorb shock and vibration of the piston 20 by the working fluid 7 40). An engaging member 22 composed of a snap ring, a washer or the like is provided at the entrance side of the insertion groove 21 so as not to be detached from the insertion groove 21 by a plurality of the cushioning members 40 mounted in the insertion groove 21 .

As shown in FIG. 6, the cushioning member 40 can be formed of a spherical rubber ball having an elastic force and a restoring force.

The cushioning member 40 mounted on the insertion groove 21 formed on one side of the piston 20 acts as a damper for the working fluid 7 instantaneously introduced through the inlet 13. That is, when the working fluid 7 flows through the inlet 13, the piston 20 moves in the horizontal direction. At this time, the working fluid 7 flows into the insertion groove 21 formed in the piston 20 The cushioning member 40 is compressed so that the force applied to the piston 20 by the working fluid 7 instantaneously is converted into the compressive force of the cushioning member 40 so as to alleviate the impact.

The inner surface of the inner chamber 14 of the cylinder tube 10 of the hydraulic cylinder 100 in which the cushioning member 40 is mounted in the piston 20 according to the embodiment of the present invention is provided with an outer surface of the piston 20, And a guide surface 15 for guiding the movement of the piston 20 to be fitted.

6, a plurality of mounting grooves 16 are formed in each of the mounting grooves 16 and a plurality of mounting grooves 16 are formed in the mounting grooves 16, It can be seen that the packing 50 for preventing leakage is provided.

The mounting groove 16 is configured to form a leak storage space 17 in which the operating fluid 7 leaked in accordance with the movement of the piston 20 is stored in a state in which the packing 50 is inserted .

In addition, the end surface of the packing 50 according to an embodiment of the present invention may be configured to be recessed from the outside to the inside so that the leaked working fluid 7 can be stored according to the movement of the piston 20 have.

The packing 50 adjacent to the most open side 12 of the plurality of packings 50 may be configured to have a leakage preventing protrusion 52 protruding toward the piston 20 so as to be inclined toward the opening side 12 .

Therefore, the piston 20 according to the embodiment of the present invention is different from the conventional piston 20 in that the piston 20 and the piston 20 are made of different parts with different diameters. 30 are integrally formed with the same diameter and three packings 50 are inserted into the mounting groove 16 in the cylinder tube 10. The packing 50 is made of a material having elasticity such as rubber lipid A leak oil storage space 17 is formed in the mounting groove 16 of the cylinder tube 10 to prevent the working fluid 7 in the cylinder tube 10 from escaping to the outside and the concave portion 51 is formed in the packing 50, So that leakage of oil can be prevented in a secondary manner.

Hereinafter, a method of operating the hydraulic cylinder 100 in which the buffer member 40 is mounted in the piston 20 according to an embodiment of the present invention will be described. The operation method of the hydraulic cylinder 100 according to the embodiment of the present invention is such that the working fluid 7 is first introduced through the inlet 13 of the cylinder tube 10, The shock absorbing member 40 mounted in the piston 20 is compressed and absorbs shock and vibration. Then, the piston 20 is moved by the working fluid 7.

7 is a schematic view showing a state in which the hydraulic fluid 7 having the cushioning member 40 mounted in the piston 20 in a state where the cushioning member 40 is compressed by the flow of the working fluid 7 through the inlet 13 according to the embodiment of the present invention, Sectional view of the cylinder 100. As shown in Fig. 8 shows that the cushioning member 40 is mounted in the piston 20 in a state in which the piston 20 is moved as the working fluid 7 flows through the inlet 13 according to the embodiment of the present invention. In the hydraulic cylinder 100 shown in Fig. FIG. 9 shows an enlarged view of a portion A in FIG.

7, when the working fluid 7 is instantaneously introduced through the inlet 13, the working fluid 7 flows into the insertion groove 21 of the piston 20, The shock absorbing member 40 absorbs the shock applied to the piston 20 by the working fluid 7 as the shock absorbing member 40 is compressed.

9, the piston 20 is moved by the packing 50 provided in each of the insertion grooves 21 formed in the guide surface 15 of the inner chamber 14, Thereby preventing leakage of the working fluid 7 due to the movement of the working fluid 7. [

In other words, as described above, according to the embodiment of the present invention, since the piston 20 and the piston rod 30 are integrated with each other to prevent the straightness from being shifted, It is possible to eliminate the noise and vibration.

9, the packing 50 is made of a resilient material such as rubber to prevent the working fluid 7 in the cylinder tube 10 from being exposed to the outside, It is found that the oil leakage storage space 17 is provided in the mounting groove 16 of the main body 16 to prevent leakage of oil.

In addition, as described above, the packing 50 according to an embodiment of the present invention is configured in the shape of a cross section. That is, by providing the concave portion 51, the leaked working fluid 7 can be stored in accordance with the movement of the piston 20. [ 10A illustrates a cross-sectional view of a packing 50 in accordance with one embodiment of the present invention.

As described above, the packing 50 adjacent to the most open side 12 of the plurality of packings 50 has a leakage preventing protrusion 52 protruding toward the piston 20 so as to be inclined toward the opening side 12 Respectively. Fig. 10B shows a cross-sectional view of a packing 50 having an oil leakage protrusion 52 according to an embodiment of the present invention.

Therefore, by providing the leak preventing protrusion 52 in the packing 50 close to the opening 12 according to the embodiment of the present invention, the tightness between the piston 20 and the cylinder tube 10 can be increased, Thereby preventing leakage in the cylinder tube 10.

That is, the piston 20 according to the embodiment of the present invention can prevent the vibration and the noise by increasing the linearity of the piston 20 and the piston rod 30, and the instantaneous inflow of the working fluid 7 The shock absorbing member 40 mounted in the piston 20 absorbs the impact of the piston 20 according to the displacement of the piston 20, The leakage of the working fluid 7 in the cylinder tube 10 is prevented primarily by the oil separator 50 and the leakage space 51 formed in the recess 51 formed in the packing 50 and the mounting groove 16, Leakage preventing protrusion 52 formed on the packing 50 closest to the opening surface 12 is used to prevent leakage of the working fluid 7 due to the leakage of the lubricant 17 from the cylinder tube 10, .

11 is a schematic view showing a state in which the piston 20 is moved as the working fluid 7 is discharged through the inlet 13 according to the embodiment of the present invention. Sectional view of the cylinder 100. As shown in Fig. FIG. 12 shows an enlarged view of a portion B in FIG.

11 and 12, when the working fluid 7 is discharged through the inlet 13 of the cylinder tube 10, the piston 20 is linearly moved in one direction.

It should be noted that the above-described apparatus and method are not limited to the configurations and methods of the embodiments described above, but the embodiments may be modified so that all or some of the embodiments are selectively combined .

1: Conventional Hydraulic Cylinder
2: Hydraulic pump
3: Solenoid valve
4: sealing member
5: Bushing
6: Dental unit chair
7: Working fluid
8: cover
10: Cylinder tube
11: Closed face
12: For the opening
13: inlet
13-1: First inlet
13-2: second inlet
14: Inner room
15: Guide face
16: Mounting groove
17: Oil storage space
20: Piston
21: Insert groove
22:
30: Piston rod
40: buffer member
50: Packing
51:
52:
100: Hydraulic cylinder in which a buffer member is mounted in the piston

Claims

In the hydraulic cylinder,
A cylinder tube including an inlet port through which the working fluid flows, an outlet through which the working fluid flows, a closing surface provided on one side surface, an opening surface provided on the other side surface, and an inner chamber forming an inner space;
A piston mounted on an inner chamber of the cylinder tube and operated according to the inflow and discharge of a working fluid flowing through the inlet; And
And a buffer member mounted on an insertion groove formed on a side surface of the piston and adapted to be compressed according to a pressure of the introduced working fluid to absorb shock and vibration of the piston due to the working fluid. Hydraulic cylinder with buffer member mounted.

The method according to claim 1,
And the inner surface of the inner chamber has a guide surface that is shaped to fit with the outer surface of the piston and guides the movement of the piston.

3. The method of claim 2,
A mounting groove is formed in the guide surface,
Wherein at least one packing for preventing the leakage of the working fluid due to the movement of the piston is provided in the mounting groove.

The method according to claim 1,
Wherein the cushioning member is formed in a spherical shape having a plurality of elastic forces.

The method of claim 3,
The mounting groove
And a leakage storage space in which the leaked working fluid is stored in accordance with the movement of the piston in a state where the packing is inserted.

The method of claim 3,
The cross section of the packing
And a hydraulic fluid leaking out of the piston due to the movement of the piston is stored in the piston.

The method according to claim 6,
Wherein a packing close to an outermost surface of a plurality of the packings has an oil leakage protruding portion protruding toward the piston so as to be inclined toward the opening side.

In a method of operating a hydraulic cylinder,
The hydraulic cylinder includes a cylinder tube including an inlet port through which a working fluid is introduced and discharged, a closed surface provided on one side surface, an opening surface provided on the other side surface and an inner chamber forming an inner space, A piston mounted on an inner chamber of the cylinder tube and operated in accordance with the inflow and outflow of a working fluid flowing through the inflow port and a piston inserted into an insertion groove formed on a side surface of the piston, And a shock absorbing member which is compressed in accordance with the operation fluid and absorbs impact and vibration of the piston by the working fluid,
Flowing a working fluid through an inlet of the cylinder tube;
Absorbing the shock and vibration while the buffer member mounted in the piston is compressed as the working fluid is introduced; And
And moving the piston by the working fluid. The method of operating a hydraulic cylinder in a piston,

9. The method of claim 8,
In the step of moving the piston,
Wherein a buffer provided in an insertion groove formed in a guide surface of the inner chamber prevents leakage of the working fluid due to movement of the piston.