KR101562605B1 - Small cylinder use oil pressure with vacuum - Google Patents

Abstract

Disclosed is a hydraulic and pneumatic small cylinder comprising: a cylinder part; a front end input/output port; a rear input/output port; a rod; and a circumference part. The front end input/output port includes: a front end entrance part formed in such a manner that an outer circumferential surface of a front end of the cylinder part is dented: and a front end connection opening connecting the front end entrance part with an interior of the cylinder part. The rear input/output port includes: a rear end entrance part formed in such a manner that an outer circumferential surface of a rear end of the cylinder part is dented; and a rear end connection part connecting the rear entrance part with the interior of the cylinder part. The rod is arranged on the interior of the cylinder part to be move frontward and backward with respect to the cylinder part. The circumference part is formed along an outer circumference of a rear end of the rod. The rear connection opening is one long hole or a plurality of holes formed in series. A rear end of the circumference part has a shape formed by cutting a corner to prevent generation of interference on a passage of a hydraulic and pneumatic pressure input and output through the rear end input/output port. When an internal diameter of the cylinder part is less than 50 pi, the cylinder part is made of aluminum, and when the internal diameter of the cylinder part is 50 pi or more, the cylinder part is made of stainless steel.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a small-

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a small cylinder for both hydraulic and pneumatic operations.

Generally, a pneumatic cylinder is a device for converting the energy of compressed air into a mechanical reciprocating linear motion, and is applied to sporting goods such as bicycles. In addition, the hydraulic cylinder is a device that implements linear motion of large output and thrust by using hydraulic pressure, and is applied to a machine tool and a civil engineering construction machine.

The difference between the application fields of the hydraulic cylinder and the pneumatic cylinder is that the rigidity against the high pressure can not be secured in applying the previously disclosed pneumatic cylinder to the hydraulic pressure. In other words, since the pneumatic cylinder is not rigid against the high pressure, it has to be applied only to the low pressure, so that there is a problem that the pneumatic cylinder and the hydraulic cylinder are not compatible with each other.

Korean Patent Publication No. 10-2004-0009116

SUMMARY OF THE INVENTION It is an object of the present invention to provide a small-sized cylinder for both hydraulic pressure and pneumatic pressure.

Another object of the present invention is to provide a compact cylinder having both the durability and the hydraulic pressure.

It is still another object of the present invention to provide a small-sized cylinder for pneumatic and hydraulic actuation, in which the input / output of the pneumatic pressure is actively controlled with respect to the movement of the rod in the longitudinal direction.

It is still another object of the present invention to provide a small-sized cylinder having both the circumferential portion and the cylinder portion reduced in frictional force when the rod is moved in the front-rear direction.

It is still another object of the present invention to provide a small-sized hydraulic cylinder cylinder capable of realizing a stable longitudinal movement of the rod.

It is still another object of the present invention to provide a small-sized cylinder which can reduce vibration acting on the rod in a direction perpendicular to the axial direction of the rod.

It is still another object of the present invention to provide a small-sized cylinder which can minimize the external force acting on the cylinder and the rod when the rod moves in the front-rear direction.

According to a first aspect of the present invention, there is provided a small-sized cylinder having both a cylinder and a cylinder. A front end inlet portion formed to be recessed from the outer circumferential surface of the front end portion of the cylinder portion so as to input and output hydraulic pressure, and a front end communication hole formed eccentrically to one side from the center of the front end inlet portion to communicate the inside of the cylinder portion with the front end inlet portion, port; A rear end inlet portion formed to be recessed from the outer circumferential surface of the rear end portion of the cylinder portion 1 and a rear end communication hole formed eccentrically to one side from the center of the rear end inlet portion so as to communicate the inside of the rear end inlet portion and the cylinder portion, A rear end input / output port including; A rod disposed inside the cylinder so as to be movable in the longitudinal direction with respect to the cylinder; And a peripheral portion formed along an outer periphery of a rear end portion of the rod, wherein the rear end communication portion is a long hole or a plurality of holes formed in a row, and a rear end portion of the peripheral portion has a pore- Wherein the cylinder portion is made of aluminum when the inner diameter of the cylinder portion is less than 50 Pa, and the cylinder portion may be made of stainless steel when the inner diameter of the cylinder portion is 50 Pa or more.

According to a first aspect of the present invention, there is provided a small-sized cylinder for pneumatic / hydraulic connection, wherein the circumference portion includes a magnet provided along the outer periphery thereof, and the cylinder portion has, on its outer circumferential surface, And a sensor provided at a portion corresponding to the position of the moved peripheral portion to generate a sensing signal by detecting that the peripheral portion is located at the foremost position.

According to a second aspect of the present invention, there is provided a small-sized cylinder for pneumatic / hydraulic connection, further comprising a guide portion provided along the outer periphery of the rod, wherein the guide portion may be provided further forward than the circumferential portion.

According to a third aspect of the present invention, there is provided a small-sized cylinder for pneumatic / hydraulic pressure combination, further comprising an elastic portion provided along the outer periphery of the rear end of the rod and extending rearward to abut the rear end surface of the cylinder portion, It may be a trumpet shape whose cross section becomes wider as it goes toward.

According to a preferred embodiment of the present invention, when the rear-end communication port of the rear-end input / output port has a plurality of holes formed in one long hole or a series of rows and the input / output of the pneumatic pressure through the rear-end input / output port, can do. As a result, the pressure applied to the rear end input / output port can be reduced.

Further, according to the above-described object of the present invention, since the front end input / output port eccentrically formed from the center of the front end inlet portion and the rear end input / output port eccentrically formed from one side of the center of the rear end inlet portion are included, It is possible to prevent the interference with the input / output of the pneumatic pressure.

According to a preferred embodiment of the present invention, the front end and rear end of the peripheral portion are chamfered so that interference does not occur in the path of the pneumatic pressure input / output through the rear end input / output port. , The pressure reduction applied to the rear end input / output port can be maximized, and the rigidity required of the cylinder portion can be reduced in accordance with the pressure generated during the input / output of the pneumatic pressure.

According to the above-mentioned object of the present invention, when the inner diameter of the cylinder portion is less than 50 Pa, the cylinder portion is made of aluminum, and when the inner diameter of the cylinder portion is 50 Pa or more, the cylinder portion is made of stainless steel, The durability is ensured and the economical efficiency in terms of manufacturing cost can be improved.

In addition, according to the above-described object of the present invention, by the magnet provided on the outer periphery of the periphery and the sensor provided on the portion corresponding to the position of the periphery moved to the forefront with respect to the outer periphery of the cylinder, The hydraulic pressure input / output of the front end input / output ports and the rear end input / output ports is made to be performed, and it is possible to prevent the abrupt pressure change in the cylinder from occurring, , It is possible to prevent the breakage of the cylinder due to a sudden pressure change.

In addition, according to the present invention, the Teflon provided at a portion having a low coefficient of friction and in contact with the inner circumferential surface of the cylindrical portion of the circumferential portion can prevent damage to the circumferential portion, which may be generated by contact between the circumferential portion and the cylinder portion, And the frictional force generated between the circumferential portion and the inner circumferential surface of the cylinder portion can be reduced, so that the movement of the circumferential portion in the longitudinal direction can be facilitated.

Further, according to the above-mentioned object of the present invention, the guide portion provided along the outer periphery of the rod can guide the movement of the rod in the longitudinal direction, and can cause the rod to move in the direction perpendicular to the axial direction of the rod. The possible vibration can be reduced.

In addition, according to the above-mentioned object of the present invention, by the elastic portion provided along the outer periphery of the rear end of the rod and extending rearward so as to abut the rear end face of the cylinder portion, The external force in the axial direction of the rod that can act on the cylinder portion and the rod can be minimized and the durability and life of the cylinder portion and the rod can be improved.

FIG. 1A is a schematic cross-sectional view of a small-sized hydraulic cylinder cylinder according to an embodiment of the present invention in which the rear end communication hole is one long shaft.
And FIG. 1B is a schematic cross-sectional view of a combined miniature cylinder for pneumatic / hydraulic pressure according to an embodiment of the present invention, wherein the rear-end communication holes are a plurality of holes formed in a row.
FIG. 2A is a schematic plan view of the rear long-term communication hole viewed from above. FIG.
FIG. 2B is a schematic plan view of the rear-end communication port, which is a plurality of holes formed in a row, from above.
2C is a schematic plan view showing a state in which two holes are formed.
FIG. 3A is a schematic cross-sectional view showing an enlarged view of FIG. 1A.
FIG. 3B is a schematic cross-sectional view showing an enlarged view of FIG. 1B.
FIG. 4A is a schematic cross-sectional view in which a guide portion and an elastic portion are additionally shown in FIG. 1A.
Fig. 4B is a schematic sectional view in which a guide portion and an elastic portion are additionally shown in Fig. 1B.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

In the entire specification of the present invention, when a part is referred to as being "connected" to another part, it is not necessarily the case that it is "directly connected", but also "electrically connected" .

In the entire specification of the present invention, when a member is located on another member, this includes not only a case where a member is in contact with another member but also a case where another member exists between the two members.

Throughout the specification of the present invention, when a part is referred to as "including " an element, it is understood that it may include other elements as well, without excluding other elements unless specifically stated otherwise. The terms "about "," substantially ", etc. used to the extent that they are used throughout the present disclosure are used in their numerical values or in close proximity to their numerical values when the manufacturing and material tolerances inherent in the stated meanings are presented, Accurate or absolute numbers are used to prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure. The word " step (or step) "or" step "used in the specification of the present invention does not mean" step for.

For reference, the terms related to directions and positions (upper side, front side, front end, rear end, rear end, etc.) in the description of the embodiments of the present invention are set based on the arrangement state of each structure shown in the drawings. 1A and 2A, the 12 o'clock direction is generally on the upper side, the 9 o'clock direction is on the whole, the overall portion is directed to the 9 o'clock position is the front end portion, the 3 o'clock direction is the rear side, The portion facing the 3 o'clock direction as a whole may be a rear end portion or the like.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a small cylinder for both hydraulic and pneumatic operations.

Hereinafter, a small-sized cylinder (also referred to as a "small-sized cylinder of the present hydraulic / pneumatic actuation") according to an embodiment of the present invention will be described.

In the small cylinder of the present hydraulic / pneumatic / hydraulic combination, the pneumatic / hydraulic pressure means hydraulic or pneumatic. In the small hydraulic cylinder / hydraulic cylinder, movement of the rod 21 is transmitted to the front end input / output port 111 and the rear end input / 112). ≪ / RTI >

FIG. 1A is a schematic cross-sectional view of a combined miniature cylinder of the present invention having a rear end communication hole as one long hole, and FIG. 1B is a schematic sectional view of a miniature combined cylinder of the present invention as a plurality of holes each having a rear end communication hole formed in a row.

1A and 1B, the small cylinder of the second embodiment includes a cylinder portion 1, a front end input / output port 111 formed at a front end portion of the cylinder portion 1 for inputting and outputting a pneumatic pressure, A rod 21 disposed in the cylinder 1 so as to be movable in the forward and backward directions with respect to the cylinder 1 and a rod 21 disposed in the cylinder 1 in the rear end of the rod 21, And a peripheral portion 22 formed along the outer periphery.

According to this configuration, when the pneumatic pressure is input into the cylinder portion 1 through the front end input / output port 111 and the pneumatic pressure is output through the rear end input / output port 112, the rod 21 is directed toward the rear end portion of the cylinder portion 1 (Backward). When the pneumatic pressure is input into the cylinder 1 through the rear input / output port 112 and the pneumatic pressure is output through the front end input / output port 111, the rod 21 moves (advances) toward the front end of the cylinder 1, . Through this process, the rod 21 can reciprocate in the front-rear direction within the cylinder part 1. [

The rear end input / output port 112 has a rear end inlet portion 1121 and a rear end inlet portion 1121 which are formed so as to be recessed from the outer peripheral surface of the rear end portion of the cylinder portion 1 so as to input and output the pneumatic pressure, (Not shown). This will be described in detail with reference to Figs. 2A and 2B.

The rear end communication hole 1122 is formed eccentrically to one side from the center of the rear end inlet portion 1121 as shown in Figs. 1A and 1B. In particular, the rear end communication port 1122 may be formed eccentrically rearward from the center of the rear end inlet portion 1121. Through this, the rear end communication port 1122 can be formed as far as possible from the movement path in the back and forth direction of the peripheral portion 22. Accordingly, it is possible to minimize the occurrence of interference with the input / output of the hydraulic pressure.

When the rear end communication port 1122 is formed with respect to the center of the rear end inlet port 1121, the input / output port 1122 is connected to the rear end port 1121 through the rear end communication port 1122 by the peripheral portion 22, The input / output of the pneumatic / hydraulic pressure may be interfered.

However, the rear-end communication hole 1122 is formed eccentrically to one side from the center of the rear-end inlet portion 1121, so that the rear-end communication hole 1122 can be maximally separated from the movement path of the peripheral portion 22, , It is possible to prevent interference with the input / output of the pneumatic pressure by the peripheral portion (22).

In addition, in the present small-sized hydraulic cylinder / combined type cylinder, referring to Figs. 1A and 2A, the rear end communication hole 1122 is a long hole. 2A. 2A is a schematic plan view of the rear-end communication port 1122, which is one long-port, as viewed from above, in order to explain a case where the rear-end communication port 1122 is one long port. In FIG. 2A, the 9 o'clock and 3 o'clock directions are the forward and backward directions, and the 12 o'clock and 6 o'clock directions are the circumferential directions of the cylinder 1 which is perpendicular to the forward and backward directions.

As shown in FIGS. 1A and 2A, the long hole means a long hole formed along the circumferential direction of the cylinder 1. The rear end communication port 1122 is formed as a long hole, so that the pneumatic pressure can be input / output at a high speed in a short time at the input / output of the pneumatic pressure through the rear end input / output port 112.

Thus, the moving speed of the rod 21 in the longitudinal direction can be improved. Also, since the input / output of the pneumatic pressure through the rear end input / output port 112 can be performed quickly in a short time, the pressure applied to the rear end input / output port 112 can be reduced. 1) can be reduced.

Alternatively, in the present miniature hydraulic cylinder / combined type cylinder, the rear end communication hole 1122 is a plurality of holes 1122 formed in a row in reference to FIG. This will be described in detail with reference to FIG. 2B. 2B is a schematic plan view of the rear-end communication port 1122, which is a plurality of holes formed in a row, from above, in order to explain the case where the rear-end communication port 1122 is a plurality of holes formed in a row. 2B, the direction of 9 o'clock and 3 o'clock is the front and rear direction, and the direction of 12 o'clock and 6 o'clock is the circumferential direction of the cylinder portion 1 which is perpendicular to the forward and backward direction.

The reason why the plurality of holes 1122 are formed in a line is that as shown in FIG. 1B, FIG. 2B and FIG. 2C, two to three holes 1122 are formed in a row along the circumferential direction of the cylinder portion 1 it means.

Accordingly, at the time of input / output of the pneumatic pressure through the rear end input / output port 112 and at the time of input / output of the pneumatic pressure through the rear end input / output port 112, the pneumatic pressure can be input / output at a high speed in a short time. Thus, the moving speed of the rod 21 in the longitudinal direction can be improved. Also, since the input / output of the pneumatic pressure through the rear end input / output port 112 can be performed quickly in a short time, the pressure applied to the rear end input / output port 112 can be reduced. 1) can be reduced.

The front end input / output port 111 has a front end inlet portion 1111 and a front end inlet portion 1111 which are formed so as to be recessed from the outer peripheral surface of the front end portion of the cylinder portion 1 so as to input and output the pneumatic pressure, (Not shown).

Like the rear-end communication port 1122, the front-end communication port 1112 is a single long hole or a plurality of holes formed in a row. The front end communication port 1112 may be formed eccentrically to one side from the center of the front end inlet 1111. The effect of the front-end communication port 1112 can be the same as the effect of the configuration of the rear-end communication port 1122 described above, and thus a detailed description thereof will be omitted.

1A and 1B, the rear end of the circumferential portion 22 is chamfered so as to prevent interference with the path of the pneumatic pressure input / output through the rear end input / output port 112. [

This will be described in detail with reference to Figs. 3A and 3B. FIG. 3A is a schematic cross-sectional view showing an enlarged view of FIG. 1A, and FIG. 3B is a schematic sectional view showing an enlarged view of FIG. 1B.

The chamfered shape may mean a shape in which a part of the rear end of the peripheral portion 22 is cut obliquely as shown in Figs. 3A and 3B.

3A and 3B, the portion of the rear end of the circumferential portion 22 on the path of the pneumatic pressure input / output from the input / output port 112 may be chamfered. In particular, the circumferential portion 22 may be chamfered, A portion of the rear end of the communication hole 1122 located in front of the communication hole 1122 can be cut.

As described above, when the rear end of the peripheral portion 22 is not chamfered, interference occurs in the path of the pneumatic pressure input and output to the rear end input / output port 112, and the force of the pneumatic pressure and the rear end input / Strong pressure may be generated in the portion where the pressure is applied.

However, according to the present miniature hydraulic cylinder, it is possible to prevent the occurrence of interference in the path of the pneumatic pressure input or output to the rear end input / output port 112 when the rear end of the peripheral portion 22 is chamfered. This reduces the pressure applied to the rear end input / output port 112 when inputting and outputting the pneumatic pressure through the rear end input / output port 112, thereby minimizing the damage to the cylinder 1 and ensuring usability of the cylinder 1 And the rigidity required of the cylinder portion 1 can be reduced in accordance with the pressure generated at the time of input / output of the hydraulic pressure.

Further, as shown in Figs. 1A and 1B, the front end portion of the peripheral portion 22 may be a chamfered shape. Accordingly, interference can be prevented from occurring in the path of the pneumatic pressure input / output through the rear end input / output port 112 by the front end portion of the circumferential portion 22.

As an example, the peripheral portion 22 may be moved to the rearmost end so that the front end of the peripheral portion 22 may be located in the vicinity of the rear end input / output port 112. Even if this happens, according to the present small-sized hydraulic cylinder, the front end portion of the circumferential portion 22 is chamfered, and interference with the input / output of the hydraulic pressure due to the front end portion of the circumferential portion 22 may not occur.

That is, the small-sized cylinder of the present hydraulic / pneumatic-pressure-type miniaturized cylinder has the chamfered shape of the front end portion and the rear end portion of the circumferential portion 22, thereby maximizing the effect of preventing interference with the input / output of the hydraulic pressure by the circumferential portion 22.

As the pressure applied to the rear end input / output port 112 increases during the input / output of the pneumatic / hydraulic input / output, the pressure in the cylinder 1 is increased, The material constituting the cylinder part 1 can be expensive. However, with this pneumatic and hydraulic combined-use small cylinder, the pressure applied to the rear end input / output port 112 can be reduced, and can be realized with a minimum cost.

When the inner diameter of the cylinder part 1 is less than 50 psi, the cylinder part 1 is made of aluminum. When the inner diameter of the cylinder part 1 is 50 Pa or more, the cylinder part 1 is made of stainless steel.

The limitation of the material with respect to the numerical value of the inner diameter of the cylinder part 1 is based on the pressure in the cylinder part 1. Specifically, the cylinder portion 1 should be made of a material capable of securing the rigidity against the pressure acting on the inside thereof. However, when the material forming the cylinder part 1 is aluminum, if the inner diameter of the cylinder part 1 is 50 psi or more, the cylinder part 1 can be damaged without wasting the pressure acting inside the cylinder part 1.

Therefore, when the inner diameter of the cylinder part 1 is 50 Pa or more, it is preferable that the material of the cylinder part 1 is made of stainless steel having stiffness stronger than aluminum. When the inner diameter of the cylinder 1 is less than 50 Pa, the price of stainless steel is higher than that of aluminum. When the inner diameter of the cylinder 1 is less than 50 Pa, the aluminum, which can secure durability against the pressure acting inside the cylinder 1, (1) can be made. Accordingly, the small-sized hydraulic cylinder and the small-sized cylinder can be produced economically while securing the durability enabling both the hydraulic pressure and the pneumatic pressure to be used together.

That is, the small cylinder of the present hydraulic / pneumatic-pressure combined type is configured such that the communication hole 1122 of the rear-end input / output port 112 is formed as a single long hole or a plurality of holes formed in a row and the rear end portion of the peripheral portion 22 is chamfered , It is possible to reduce the pressure applied to the cylinder portion 1 and to apply the hydraulic pressure to the high pressure as compared with the pneumatic and pneumatic pressures.

In addition, this small-sized hydraulic cylinder can be produced economically while securing the durability enabling both the hydraulic pressure and the pneumatic pressure to be used through the limitation of the material with respect to the numerical value of the inner diameter.

For reference, the inner diameter of the cylinder portion 1 may mean the inner diameter of the portion C where the inner diameter of the cylinder portion 1 is the largest.

For example, when the inner diameter of the cylinder portion 1 is less than 50 Pa, the cylinder portion 1 may have an inner diameter of 20 pi, 25 pi, 32 pi, 40 pi, 50 pi or the like.

1A and 1B, the peripheral portion 22 may include a magnet 222 provided along the outer periphery thereof.

The cylindrical portion 1 is provided at a portion corresponding to the position of the peripheral portion 22 moved to the foremost position by the movement of the rod 21 relative to the outer peripheral surface thereof so that the peripheral portion 22 is located at the forefront And a sensor (not shown) that senses and generates a sensing signal.

The fact that the sensor is provided at the portion corresponding to the position of the peripheral portion 22 moved to the forefront by the movement of the rod 21 relative to the outer peripheral surface of the cylinder portion 1 means that the rod The sensor may be provided at a portion surrounding the position point of the circumferential portion 22 moved to the forefront by the movement of the sensor 21.

When the sensor senses movement to the forefront of the circumference 22 and generates a sensing signal, each of the front end input / output port 111 and the rear end input / output port 112 performs input / output of the pneumatic pressure corresponding to the sensing signal generated by the sensor .

More specifically, when the sensor generates a sense signal, it means that the perimeter 22 is positioned at the foremost position, which means that the forward movement of the rod 21 is completed. After the rod 21 is moved forward, the rod 21 must be moved backward. The front end input / output port 111 can input the pneumatic pressure, and the rear end input / output port 112 outputs the pneumatic pressure can do.

That is, when the sensor generates the sensing signal, the front end input / output port 111 can input the pneumatic pressure and the rear end input / output port 112 can output the pneumatic pressure. Accordingly, the pneumatic / hydraulic input / output of the front end input / output port 111 and the rear end input / output port 112 can be actively performed depending on the position of the rod 21, and the state in which the peripheral portion 22 is not moved to the forefront, In other words, it is possible to prevent the problem of input / output of the pneumatic pressure through the front end input / output port 111 and the rear end input / output port 112 in a state in which the forward movement of the rod 21 is not completed.

However, according to this small-sized hydraulic cylinder, after the frontward movement of the peripheral portion 22 is completed, the front end input / output port 111 receives the pneumatic pressure input and the pneumatic pressure output of the rear end input / output port 112, 1, it is possible to prevent the cylinder 1 from being damaged due to a sudden pressure change.

1A and 1B, a Teflon 223 may be provided on an outer circumferential surface of the circumferential portion 22. Specifically, as shown in Figs. 1A and 1B, the Teflon 223 may be provided at a portion of the circumferential portion 22 in contact with the inner circumferential surface of the cylinder portion 1. As a result, damage to the portion that is in contact with the peripheral portion 22 and the inner peripheral surface of the cylinder portion 1 can be prevented.

Further, since the Teflon 223 has a low coefficient of friction, the movement of the circumferential portion 22 can be facilitated when the rod 21 is moved in the longitudinal direction.

Specifically, if the Teflon 223 is not provided, the outer circumferential portion 22 and the inner circumferential surface of the cylinder portion 1 are in contact with each other when the rod 21 abuts against the inner circumferential surface of the cylinder portion 1 when the rod 21 moves. The frictional force may be large. According to this small-sized hydraulic cylinder, however, a Teflon 223 having a low coefficient of friction is provided at a portion of the circumferential portion 22 that abuts against the cylinder portion 1, and the circumferential portion 22 and the cylinder portion 1 The frictional force that can be generated in contact can be reduced and the movement of the peripheral portion 22 can be facilitated.

1A and 1B, an O-ring ring 221 may be disposed on the outer peripheral surface of the peripheral portion 22. [

Hereinafter, the guide portion 3 and the elastic portion 4 will be described in detail with reference to Figs. 4A and 4B. Fig. 4A is a schematic sectional view in which the guide portion 3 and the elastic portion 4 are additionally shown in Fig. 1A, and Fig. 4B is a schematic sectional view in which the guide portion 3 and the elastic portion 4 are additionally shown in Fig. to be.

Referring to FIGS. 4A and 4B, the small-sized hydraulic cylinders may include a guide portion 3 provided along the outer periphery of the rod 21. As shown in FIG. As shown in Figs. 4A and 4B, the guide portion 3 may be provided further forward than the circumferential portion 22. 4A and 4B, the guide portion 3 may be disposed so as to abut the inner periphery of the cylinder portion 1.

Accordingly, the guide portion 3 can guide the movement of the rod 21 when the rod 21 moves in the front-rear direction. In addition, it is possible to reduce vibrations that may occur in the rod 21 in a direction perpendicular to the axial direction of the rod 21.

Illustratively, vibration may occur in the rod 21 due to the flow of the pore pressure during the input / output of the pore pressure. With respect to such vibration, the guide portion 3 can reduce the vibration of the rod 21. [ Further, the guide portion 3 may be an elastic body. Thus, even if vibration occurs in a direction perpendicular to the axial direction of the rod 21, a buffering action against the rod 21 can be achieved.

The small-sized hydraulic cylinder also includes an elastic portion 4 provided along the outer periphery of the rear end of the rod 21 and extending rearward so as to abut the rear end surface of the cylinder portion 1.

The elastic portion 4 can cause a buffering action on the rod 21 in the axial direction of the rod 21 when the rod 21 is moved in the longitudinal direction. It is possible to minimize the external force in the axial direction of the rod 21 which can act on the cylinder part 1 and the rod 21 when the rod 21 moves in the forward and backward direction, It is possible to improve the durability and the life of the battery.

Further, the elastic portion 4 may have a trumpet shape whose cross section widens toward the rear. As a result, the elastic part 4 can be prevented from being separated from the elastic part 4, and the elastic part 4 can be stably driven. If the elastic part 4 is a straight shape rather than a trumpet shape, the elastic part 4 will be arranged in a straight line from the rod 21 toward the rear. In this case, the elastic part 4 is elastically driven If it is repeated, the rear end of the elastic portion 4 can be released from its original position. When the release of the elastic part 4 occurs, the separated elastic part 4 can interfere with the movement of the rod 21. [

However, in the small-sized hydraulic cylinders according to the second embodiment, the resilient portion 4 has a trumpet shape, and the rear end thereof can stably support the movement of the rod 21. As a result, the elastic part 4 can be prevented from being separated from the elastic part 4, and the elastic part 4 can be stably driven.

4A and 4B, the cylinder part 1 may include a front end block 11 and a rear end block 12. [ As shown in Figs. 4A and 4B, the front end block 11 and the rear end block 12 can be screwed together. 4A and 4B, the sealing ring 5 may be disposed so as to prevent the pneumatic pressure from flowing out through the threaded portions of the front end block 11 and the rear end block 12.

The effects of the above-described small-sized cylinder for both hydraulic and pneumatic pressures are summarized as follows.

First, when the rear cylinder inlet / outlet port 112 is opened and closed, a rear end communication port 1122 of the rear end input / output port 112 is provided with a plurality of holes formed in one long hole or a row, The pressure applied to the input / output port 112 can be reduced.

According to the present hydraulic cylinder 2, the rear end of the peripheral portion 22 is chamfered (chamfered) so that interference does not occur in the path of the pneumatic pressure input / output through the rear end input / output port 112, The pressure applied to the rear end input / output port 112 can be reduced, and the rigidity required of the cylinder portion 1 can be reduced according to the pressure generated when the pneumatic pressure is input / output.

According to the present hydraulic cylinder / hydraulic cylinder, when the inner diameter of the cylinder portion 1 is less than 50 psi, the cylinder portion 1 is made of aluminum, and when the inner diameter of the cylinder portion 1 is 50 psi or more, The cylinder part 1 is made of stainless steel. Accordingly, the small-sized hydraulic cylinder and the small-sized cylinder can be economically produced while ensuring durability despite the combination of hydraulic pressure and pneumatic pressure.

According to the present miniature cylinder, the magnet 222 provided along the outer periphery of the peripheral portion 22 and the portion corresponding to the position of the peripheral portion 22 moved to the forefront with respect to the outer peripheral surface of the cylinder portion 1 Output of the front end input / output port 111 and the rear end input / output port 112 can be sensed by sensors for sensing the magnet 222, And the like. Accordingly, it is possible to prevent the sudden pressure change in the cylinder 1 from being generated, thereby preventing the breakage of the cylinder 1 due to the abrupt pressure change.

The small cylinder of the present hydraulic / pneumatic-hydraulic combination has a low coefficient of friction and includes a Teflon 223 provided at a portion of the circumferential portion 22 which abuts against the inner circumferential surface of the cylinder portion 1, The circumferential portion 22 and the cylinder portion 1 which may be caused by the contact between the circumferential portion 22 and the cylinder portion 1 and the circumferential portion 22 which may occur when the circumferential portion 22 and the cylinder portion 1 contact each other, It is possible to prevent the portion 22 from being damaged.

The small cylinder of the present hydraulic / pneumatic-hydraulic combination also includes the guide portion 3 provided along the outer periphery of the rod 21 so that it can guide the movement of the rod 21 when the rod 21 moves in the longitudinal direction , Vibrations that may occur in the rod (21) in a direction perpendicular to the axial direction of the rod (21) can be reduced.

The small-sized hydraulic cylinder also includes an elastic portion 4 provided along the outer periphery of the rear end of the rod 21 and extending rearward so as to abut the rear end surface of the cylinder portion 1. The external force in the axial direction of the rod 21 which can act on the cylinder portion 1 and the rod 21 when the rod 21 is moved in the longitudinal direction is minimized and the cylinder portion 1 and the rod 21, The durability and life of the battery can be improved.

On the other hand, a coating layer containing a silicon component may be formed on the outer circumferential surface of the cylinder part 1 in order to solve the problem of surface contamination, which is a cause of shortening of life time and shortening of the sensor. More specifically, a sensor may be provided on the outer circumferential surface of the cylinder portion 1, and a coating layer may be formed on the sensor. The coating layer prevents the adhesion of microorganisms and floating matters, thereby preventing the outdoors and extending the service life of the sensor semi-permanently.

A brief description of the method for preparing the coating solution is as follows. First, dimethyldichlorosilane solution is dissolved in ethyl acetate at a volume ratio of 2-5% to prepare a coating solution. At this time, if the content of the dimethyldichlorosilane solution is less than 2%, the coating effect can not be sufficiently obtained, and if it exceeds 5%, the coating layer becomes too thick and the efficiency drops. In view of the coating time and the coating thickness, it is preferable that the viscosity of the solution is in the range of 0.8-2 cp (centipoise). This is because if the viscosity is too low, the coating time must be long. If the viscosity is too high, the coating may become thick and dry, and non-uniform coating may cause the sensor to come out.

Further, in the present miniature cylinder for pneumatic and hydraulic pressures, the coating layer can be coated to a thickness of 1 탆 or less by the coating solution prepared as described above. At this time, if the thickness of the coating layer exceeds 1 탆, the sensitivity of the sensor may be lowered. Therefore, in the present invention, the thickness of the coating layer is limited to 1 탆 or less. As a coating method having the above-described thickness, a spray method in which the surface of the sensor is sprayed about 2-3 times may be used.

In addition, in the small-sized cylinder of the present pneumatic / hydraulic combination, a wear-resistant coating layer may be formed on the outer circumferential surface of the rod 21.

The abrasion resistant coating layer is formed by spraying a powder composed of 96 to 98% by weight of chromium oxide (Cr 2 O 3) and 2 to 4% by weight of titanium dioxide (TiO 2) in the rod 21 and having a thickness of 50 to 600 μm And the hardness is plasma-coated to maintain 900 to 1000 HV.

The abrasion resistant coating layer is formed by spraying a powder composed of 96 to 98% by weight of chromium oxide (Cr2O3) and 2 to 4% by weight of titanium dioxide (TiO2).

The reason why the ceramic coating is applied to the outer surface of the rod 21 is to prevent abrasion and corrosion. Compared to chrome plating or nickel chrome plating, the ceramic coating is excellent in corrosion resistance, scratch resistance, abrasion resistance, impact resistance and durability.

Chromium oxide (Cr2O3) acts as a passivity layer that blocks oxygen entering the inside of the metal, thereby preventing rusting.

Titanium dioxide (TiO2) is a white pigment because it is very stable physicochemically and has high hiding power. And is also widely used for ceramics having high refractive index because of high refractive index. And has characteristics of photocatalytic property and superhydrophilic property. Titanium dioxide (TiO2) acts as an air purification function, an antibacterial function, a harmful substance decomposition function, a pollution prevention function, and a discoloration prevention function. The titanium dioxide (TiO2) ensures that the wear-resistant coating layer is coated on the outer circumferential surface of the rod 21, and the foreign matter adhering to the wear-resistant coating layer is decomposed and removed to prevent the wear-resistant coating layer from being damaged.

When chromium oxide (Cr 2 O 3) and titanium dioxide (TiO 2) are mixed and used, the mixing ratio thereof is such that 2 to 4% by weight of titanium dioxide (TiO 2) is mixed with 96 to 98% by weight of chromium oxide (Cr 2 O 3) desirable.

When the mixing ratio of chromium oxide (Cr 2 O 3) is less than 96 to 98%, the coating of chromium oxide (Cr 2 O 3) is often broken in an environment of high temperature and the like, The sudden drop was.

When the mixing ratio of titanium dioxide (TiO2) is less than 2 to 4% by weight, the effect of titanium dioxide (TiO2) is insignificant so that the purpose of mixing it with chromium oxide (Cr2O3) is discolored. That is, titanium dioxide (TiO2) decomposes foreign substances attached to the outer circumferential surface of the rod 21 to prevent corrosion or damage to the outer circumferential surface of the rod 21. The mixing ratio is less than 2 to 4 wt% There is a problem that it takes much time to decompose the attached foreign matter.

The coating layer made of these materials is plasma-coated to have a thickness of 50 to 600 mu m around the outer circumferential surface of the rod 21, a hardness of 900 to 1000 HV, and a surface roughness of 0.1 to 0.3 mu m.

The anti-wear coating layer is sprayed by spraying the powder powder and gas at 1400 DEG C at a Mach 2 speed around the circumference of the rod 21 to 50 to 600 mu m.

If the thickness of the wear-resistant coating layer is less than 50 탆, the above-mentioned effect of the ceramic coating layer can not be guaranteed. If the thickness of the wear-resistant coating layer exceeds 600 탆, the above- There is a problem that working time and material cost are wasted.

The temperature of the outer circumferential surface of the rod 21 is raised while the wear prevention coating layer is coated on the outer circumferential surface of the rod 21 so that the outer circumferential surface of the rod 21 is cooled by the cooling device Lt; RTI ID = 0.0 > 200 C < / RTI >

A sealing material made of anhydrous chromic acid (CrO3) made of a metal-based glass quartz system may further be applied to the periphery of the abrasion-resistant coating layer. Anhydrous chromic acid is applied as an inorganic sealing material around a coating layer made of chromium nickel powder.

Anhydrous chromic acid (CrO3) is used in places that require high abrasion resistance, lubricity, heat resistance, corrosion resistance and releasability, is not discolored in the atmosphere, has high durability, and has good abrasion resistance and corrosion resistance. The coating thickness of the sealing material is preferably about 0.3 to 0.5 mu m. If the coating thickness of the sealing material is less than 0.3 占 퐉, the sealing material easily peels off even in a slight scratch groove, so that the above-mentioned effect can not be obtained. If the coating thickness of the sealing material is made thick enough to exceed 0.5 탆, pin holes, cracks, and the like will increase on the plated surface. Therefore, the coating thickness of the sealing material is preferably about 0.3 to 0.5 mu m.

Therefore, since the coating layer having excellent abrasion resistance and oxidation resistance is formed around the outer circumferential surface of the rod 21, the outer circumferential surface of the rod 21 is prevented from being worn or oxidized, thereby extending the service life of the product.

On the other hand, RD (Polymerized trimethyl dihydroquinoline) is added to the O-ring 221 made of rubber to increase oxidation resistance. This RD increases ozone resistance and oxidation resistance and prevents corrosion and oxidation of the O-ring 221.

The present invention preferably includes 0.4 to 1.2 parts by weight of RD in the synthetic resin material. This is because if the addition amount of RD is less than the above-mentioned range, it is difficult to obtain oxidation resistance, and if it exceeds the above-mentioned range, the density and firmness of the tissue are affected.

Since RD is further added to the O-ring 221 made of rubber, the oxidation resistance of the present invention is greatly improved, and thus the service life of the product can be maximized.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

1: cylinder part 11: shear block
111: front end input / output port 1111: front end inlet portion
1112: sheathed communication hole 112: rear end input / output port
1121: rear end inlet portion 1122: rear end communication port
12: rear end block 21: rod
22: circumference 221: O-ring
222: Magnet 223: Teflon
3: guide part 4: elastic part
5: Sealing ring

Claims (5)

As a small-sized hydraulic cylinder,
A cylinder portion 1;
A front end inlet portion 1111 formed to be recessed from the outer circumferential surface of the front end portion of the cylinder portion 1 so as to input and output the pneumatic pressure and a front end inlet portion 1111 formed eccentrically to one side from the center of the front end inlet portion 1111, A front end input / output port 111 including a front end communication port 1112 for communicating the inside of the cylinder portion 1;
A rear end inlet portion 1121 formed to be recessed from the outer circumferential surface of the rear end portion of the cylinder portion 1 and a rear end inlet portion 1121 formed eccentrically to one side from the center of the rear end inlet portion 1121, A rear end input / output port 112 including a rear end communication port 1122 for communicating the inside of the cylinder part 1;
A rod (21) arranged inside the cylinder part (1) so as to be movable in the longitudinal direction with respect to the cylinder part (1); And
And a circumferential portion (22) formed along an outer periphery of a rear end portion of the rod (21)
The front end communication port 1112 and the rear end communication port 1122 may be one long hole or a plurality of holes formed in a row,
The front end portion and the rear end portion of the circumferential portion 22 are chamfered so that interference does not occur in the path of the pneumatic pressure input / output through the rear end input / output port 112,
When the inner diameter of the cylinder part 1 is less than 50 Pa, the cylinder part 1 is made of aluminum. When the inner diameter of the cylinder part 1 is 50 Pa or more, the cylinder part 1 is made of stainless steel;
A coating liquid prepared by dissolving a dimethyldichlorosilane solution in an ethyl acetate solution at a volume ratio of 2-5% is coated on the outer circumferential surface of the cylinder part 1, and the coating solution has a viscosity of 0.8-2 cp (centipoise ≪ / RTI >
A wear-resistant coating layer is formed on the outer circumferential surface of the rod 21. The wear-resistant coating layer is composed of a mixture of 96 to 98% by weight of chromium oxide (Cr2O3) and 2 to 4% by weight of titanium dioxide (TiO2) ) And is plasma-coated to a thickness of 50 to 600 mu m and a hardness of 900 to 1000 HV;
Characterized in that an O-ring (221) of rubber is provided with RD (Polymerized trimethyl dihydroquinoline) to increase oxidation resistance, and 0.4 to 1.2 parts by weight of RD is contained in an O-ring (221) made of rubber.
The method according to claim 1,
The peripheral portion 22 includes a magnet 222 provided along the outer periphery thereof,
The cylinder portion 1 is provided at a portion corresponding to the position of the circumferential portion 22 moved to the foremost position by the movement of the rod 21 with respect to the outer circumferential surface thereof so that the circumferential portion 22 is located at the forefront And a sensor for sensing a position of the piston and generating a sensing signal. The method according to claim 1,
And a guide part (3) provided along the outer periphery of the rod (21)
And the guide portion (3) is provided further forward than the circumferential portion (22). The method according to claim 1,
Further comprising an elastic part (4) provided along the outer periphery of the rear end of the rod (21) and extending rearward so as to abut the rear end surface of the cylinder part (1)
And the resilient portion (4) has a trumpet shape whose cross section is wider toward the rear side. 2. The connector according to claim 1, wherein an outer peripheral surface of the peripheral portion (22)
And a Teflon (223) is provided to prevent a portion of the peripheral portion (22) contacting the inner peripheral surface of the cylinder portion (1) from being damaged.

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