KR20160062425A - Single acting hydraulic cylinder can control of the pressure of static pressure bearing - Google Patents

Single acting hydraulic cylinder can control of the pressure of static pressure bearing Download PDF

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Publication number
KR20160062425A
KR20160062425A KR1020140165123A KR20140165123A KR20160062425A KR 20160062425 A KR20160062425 A KR 20160062425A KR 1020140165123 A KR1020140165123 A KR 1020140165123A KR 20140165123 A KR20140165123 A KR 20140165123A KR 20160062425 A KR20160062425 A KR 20160062425A
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KR
South Korea
Prior art keywords
pressure
hydraulic cylinder
piston
pockets
conduit
Prior art date
Application number
KR1020140165123A
Other languages
Korean (ko)
Inventor
서호덕
Original Assignee
서호덕
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 서호덕 filed Critical 서호덕
Priority to KR1020140165123A priority Critical patent/KR20160062425A/en
Publication of KR20160062425A publication Critical patent/KR20160062425A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)

Abstract

The present invention relates to a single acting hydraulic cylinder capable of controlling the pressure of a hydrostatic bearing capable of constantly maintaining the pressure of a hydrostatic bearing formed in a piston in a single acting hydraulic cylinder. The single acting hydraulic cylinder is divided into an advancing chamber and a reverse chamber, A single acting hydraulic cylinder comprising a piston in which a plurality of pockets are formed, the valve comprising: a valve installed in the piston to maintain a constant pressure of hydraulic oil supplied to each of the pockets; Can be achieved by a single-acting hydraulic cylinder capable of controlling the pressure of the fluid.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a single acting hydraulic cylinder capable of controlling the pressure of a hydrostatic bearing,

The present invention relates to a single-acting hydraulic cylinder capable of controlling the pressure of a hydrostatic bearing. More particularly, the present invention relates to a single-acting hydraulic cylinder capable of controlling the pressure of a hydrostatic bearing. More specifically, hydraulic pressure acts on only one side of the piston, The present invention relates to a single-acting hydraulic cylinder capable of controlling a hydrostatic bearing formed on a piston of a hydraulic cylinder.

Generally, a single acting hydraulic cylinder is a cylinder in which the output is generated only in one direction due to the action of hydraulic pressure on only one side of the piston, and the return action is performed by self weight, spring, and external force.

Such a single acting cylinder forms a plurality of pockets on the outer circumferential surface of the reciprocating piston and supplies hydraulic oil to the respective pockets to form a static pressure bearing, thereby keeping the piston always floating in the oil, thereby preventing mechanical friction.

However, in the single acting type cylinder, when the piston advances, the spring for moving the piston backward is compressed, so that the pressure of the hydraulic oil for advancing the piston due to the elastic force (external force) is continuously increased, and the pressure of the static pressure bearing on the piston side is raised Respectively.

As a result, force imbalance occurs between the hydrostatic bearing on the rod side and the hydrostatic bearing on the piston side, causing mechanical damage to the rod or the piston, thereby causing a fatal problem of damage to the rod and the piston. .

Korean Registered Patent No. 10-1176924 (August 20, 2012)

SUMMARY OF THE INVENTION The present invention provides a single acting hydraulic cylinder capable of controlling the pressure of a static pressure bearing capable of constantly maintaining a pressure of a static pressure bearing formed in a piston in a single acting hydraulic cylinder, .

The above and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: FIG. 1 is a perspective view of a single-acting hydraulic cylinder, And a valve that keeps the pressure of the hydraulic fluid supplied to the pockets constant. The pressure control of the hydrostatic bearing can be achieved by a single acting hydraulic cylinder.

As described above, according to the present invention, the following effects can be expected.

In the single-rod constant-pressure bearing cylinder, the static-pressure bearing on the piston side has an advantage that the static pressure which is changed by the external force can be kept constant, thereby balancing the force with the static-pressure bearing on the rod side. This prevents the eccentric load and prevents damage to the rod and the piston caused by the offset load, thereby improving the durability of the hydraulic cylinder and reducing the cost of maintenance.

1 is a longitudinal sectional view showing the present invention.
2 is a view showing an AA cross section in Fig.
3 is a circuit diagram of a valve according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to the description, the present invention is intended to maintain the pressure of the static pressure bearing for preventing the mechanical friction between the piston and the rod of the single acting hydraulic cylinder to be constant, and more particularly, to the pressure of the static pressure bearing optimized for the single acting single rod hydraulic cylinder It is important to note that this is a control technology.

1 showing the single-acting hydraulic cylinder capable of controlling the pressure of the hydrostatic bearing according to the present invention and FIG. 2 showing the sectional view taken along line AA of FIG. 1, the present invention is characterized in that the piston of the single- A piston 200, and a valve 300 to maintain a constant pressure of the static pressure bearing that floats.

The hydraulic cylinder 100 includes a piston 200 that is operated in a single operation and divides the inside of the hydraulic cylinder 100 into an advance chamber 110 and a reverse chamber 120.

In detail, the hydraulic cylinder 100 is installed such that a rod (not shown) penetrates the hydraulic cylinder 100 in the longitudinal direction, but slidably penetrates the penetrating portion. The piston 200 is integrally formed on the rod and divides the inside of the hydraulic cylinder 100 into an advance chamber 110 and a reverse chamber 120. The rod and the piston 200 are advanced by the hydraulic oil supplied to the advance chamber 110 and a spring for generating an external force to reverse the advanced rod may be installed outside the hydraulic cylinder 100.

In addition, a plurality of pockets 250 are formed on the outer circumferential surface of the piston 200 along the outer periphery thereof to enable the hydrostatic bearings to be formed by the hydraulic fluid supplied from the advance chamber 110. In addition, a plurality of rod pockets (not shown) are formed along the inner periphery of the rod-penetrating portion of the hydraulic cylinder 100 to enable formation of the hydrostatic bearing by hydraulic oil supplied from the outside of the hydraulic cylinder 100.

In order to realize the pressure control of the static pressure bearing formed on the pockets 250 of the piston 200 constructed as above, the pressure of the hydraulic oil supplied to the respective pockets 250 is constantly maintained in the piston 200 A valve 300 is provided for holding the valve 300.

Hereinafter, the internal structure of the piston 200 and the valve 300 will be described in detail with reference to FIG. 3 showing a circuit diagram of the valve according to the present invention.

The piston 200 includes a first conduit 210 communicating with the front chamber 110 and a second conduit 220 communicating with the respective pockets 250. The second conduit 220 communicates with the rear chamber 120, A third channel 230 is formed.

The valve 300 is connected to the first conduit 210 and the second conduit 220. When the hydraulic pressure of the second conduit 220 rises above a predetermined pressure, And the second conduit 220 are shut off, the pressure of the static pressure bearing formed in each of the pockets 250 can be kept constant. The valve 300 is connected to the first conduit 210 and the second conduit 220. When the hydraulic pressure of each of the pockets 250 rises above a predetermined pressure, The pressure of the static pressure bearings formed in the respective pockets 250 can be maintained constant by connecting the three pipes 230.

The valve 300 includes a first port 310 connected to the first conduit 210, a second port 320 connected to the second conduit 220, and a second port 320 connected to the third conduit 230. The third port 330 may be formed so that the valve 300 is closed when the pressure on the second conduit 220 falls within a range below a predetermined pressure, 2 ports 320 are connected to supply hydraulic oil to each of the pockets 250 to enable the formation of a hydrostatic bearing and the pressure of the hydraulic oil flowing into the second conduit 220 due to the rise of the pressure of the advance chamber 110 The valve 220 closes the first port 310 and the second port 320 and the second port 320 is closed by the second channel 320. When the pressure on the second channel 220 becomes greater than the set pressure of the valve 300, (220) to remain constant in a range below the set pressure of the valve.

The valve 300 also connects the first port 310 and the second port 320 to each of the pockets 250 when the pressure of the respective pockets 250 falls within a range of less than a set pressure of the valve. The pressure of the static pressure bearings is unbalanced or raised in each of the pockets 250 by the external force so that the pressure of each of the pockets 250 is unbalanced or raised, The valve 220 connects the second port 320 to the third port 330 and discharges the operating fluid of each of the pockets 250 to the rear chamber.

In addition, an orifice is provided at the entrance of each of the pockets 250 to facilitate adjustment of the flow rate and pressure of the hydraulic fluid provided in each of the pockets 250, and oil grooves a labyrinth seal formed of a plurality of oil grooves and a plurality of gaps is formed to recover hydraulic fluid leaking from each of the pockets 250 and to enhance the lubricating action by using the fluid to be leaked.

As described above, it is understood that the basic technical idea of the present invention is to provide a single-acting hydraulic cylinder capable of controlling the pressure of the hydrostatic bearing capable of constantly maintaining the pressure of the hydrostatic bearing formed in the piston in the single acting hydraulic cylinder.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the scope of the present invention should be construed within the scope of the appended claims to cover various modifications.

100: Hydraulic cylinder 110: Forward chamber
120: Reverse chamber
200: piston 210: first conduit
220: second conduit 230: third conduit
250: Pocket
300: valve 310: first port
320: second port 330: third port

Claims (4)

1. A single acting hydraulic cylinder comprising a piston (200) defining an inside of an advance chamber (110) and a back chamber (120) and having a plurality of pockets (250)
And a valve (300) installed inside the piston (200) to keep the pressure of the hydraulic fluid supplied to each of the pockets (250) constant. The single - acting hydraulic pressure cylinder. The method according to claim 1,
Inside the piston 200,
A first conduit 210 communicating with the front chamber 110,
A second conduit 220 communicating with the respective pockets 250,
And a third conduit (230) communicating with the rear chamber (120) is formed in the rear chamber (120). 3. The method of claim 2,
The valve (300)
When the hydraulic pressure of the second conduit 220 rises above a predetermined pressure, the first conduit 210 and the second conduit 220 are connected to each other, ) Of the hydrostatic bearing is cut off. The method according to claim 2 or 3,
The valve (300)
When the hydraulic pressure of each of the pockets 250 rises above a predetermined pressure, the first and second pipes 210 and 230 are connected to each other so that the first pipe 210 and the second pipe 220 are connected to each other. Wherein the first and second hydraulic cylinders are connected to each other.
KR1020140165123A 2014-11-25 2014-11-25 Single acting hydraulic cylinder can control of the pressure of static pressure bearing KR20160062425A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020140165123A KR20160062425A (en) 2014-11-25 2014-11-25 Single acting hydraulic cylinder can control of the pressure of static pressure bearing

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101951153B1 (en) * 2018-08-13 2019-02-21 동의대학교 산학협력단 Vapor turbine governor
CN110307206A (en) * 2019-06-21 2019-10-08 同济大学 A kind of low internal leakage anti-bias load cylinder device
EP3866550A1 (en) 2015-10-20 2021-08-18 Wilus Institute of Standards and Technology Inc. Wireless communication method and wireless communication terminal in high-density environment including overlapped basic service set

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101176924B1 (en) 2012-04-18 2012-08-30 서호덕 Piston's hydrostatic bearing of single rod cylinder

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101176924B1 (en) 2012-04-18 2012-08-30 서호덕 Piston's hydrostatic bearing of single rod cylinder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3866550A1 (en) 2015-10-20 2021-08-18 Wilus Institute of Standards and Technology Inc. Wireless communication method and wireless communication terminal in high-density environment including overlapped basic service set
KR101951153B1 (en) * 2018-08-13 2019-02-21 동의대학교 산학협력단 Vapor turbine governor
CN110307206A (en) * 2019-06-21 2019-10-08 同济大学 A kind of low internal leakage anti-bias load cylinder device

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