KR20110041610A - Hydraulic cylinder cushion device in cover end - Google Patents

Hydraulic cylinder cushion device in cover end Download PDF

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Publication number
KR20110041610A
KR20110041610A KR1020090098520A KR20090098520A KR20110041610A KR 20110041610 A KR20110041610 A KR 20110041610A KR 1020090098520 A KR1020090098520 A KR 1020090098520A KR 20090098520 A KR20090098520 A KR 20090098520A KR 20110041610 A KR20110041610 A KR 20110041610A
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KR
South Korea
Prior art keywords
hydraulic cylinder
cover end
plunger
piston
cushion device
Prior art date
Application number
KR1020090098520A
Other languages
Korean (ko)
Inventor
정윤현
Original Assignee
볼보 컨스트럭션 이큅먼트 에이비
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 볼보 컨스트럭션 이큅먼트 에이비 filed Critical 볼보 컨스트럭션 이큅먼트 에이비
Priority to KR1020090098520A priority Critical patent/KR20110041610A/en
Publication of KR20110041610A publication Critical patent/KR20110041610A/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
    • F15B15/088—Characterised by the construction of the motor unit the motor using combined actuation, e.g. electric and fluid actuation
    • 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
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1457—Piston rods
    • F15B15/1461—Piston rod sealings
    • 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
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/226—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having elastic elements, e.g. springs, rubber pads
    • 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
    • F15B20/005—Leakage; Spillage; Hose burst

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Actuator (AREA)

Abstract

PURPOSE: A hydraulic cylinder cushion apparatus for a cover end is provided to improve performance of a cushion even in case of excessive pressure. CONSTITUTION: A hydraulic cylinder cushion apparatus for a cover end comprises a throttle fluid path(31). The throttle fluid path is formed on the cover end(30) of the hydraulic cylinder. One or more of U-shaped or V-shaped notches are formed in the throttle fluid path. The buffer pressure power which prevents that piston and cover end drastically collide is occurred. When a piston(40) is moved to the cover end, a plunger is inserted into one end of a rod(20) of a cover end side.

Description

Hydraulic cylinder cushion device in cover end

The present invention relates to a hydraulic cylinder cushion device, and more particularly, to improve the cushion performance by allowing the throttle flow path is formed in the cover end.

As shown in Figure 1, the internal structure of a conventional hydraulic pneumatic cylinder for a construction machine, as a pressure vessel, the tube (Tube) for guiding the linear movement of the piston and the axis of the linear reciprocating movement of the cylinder with a long circular rod It is used to maintain pressure by separating rod, head cover with packing to prevent external leakage of fluid inside the tube, and large chamber and small chamber inside the tube. It consists of a cushion plunger for absorbing mechanical impact at the piston and stroke end.

1 shows a situation where the cushion plunger has entered the cover end and a representative shape of the cushion plunger.

In the case of a built-in cushion cylinder, a cushion system is configured to reduce mechanical impact at the stroke end. Most of the approaches use a ring type or a plunger type. It is composed of a structure that reduces the impact force by reducing the speed of the piston by gradually throttling the flow path by adjusting the opening area on the flow path exiting.

In such a rapid flow passage, a cushion pressure of more than twice the normal working pressure is generated in the cushion chamber at the initial initiation of the cushioning, which affects the strength of the cushioning mechanism and other counterparts such as cushioning. In order to soften such a sudden increase in pressure, conventional methods have been designed to smoothly decelerate and reduce impact force by slowly throttling a flow path by processing a notch of a specific shape on the surface of the cushion plunger in a straight line, a tapered shape, or the like.

However, in actual cushion plunger type, the size of the notch is limited. In particular, if the area of the notch is excessive, the strength of the cushion plunger should be strengthened and the size of the cushion plunger should be reinforced. The in-rod side plunger mounting diameter may be increased to reinforce the cushion, but in this case, the rod-side cushion plunger mounting portion may have a relatively large void ratio of the inner diameter, thereby causing a problem that the overall cylinder strength becomes disadvantageous.

The present invention is to solve the problems described above, an embodiment of the present invention relates to improving the cushion performance by allowing the throttle flow path is formed in the cover end.

According to a preferred embodiment of the present invention, the rod is a hydraulic cylinder cushioning device installed in the hydraulic cylinder reciprocating in the cylinder tube and discharges the high-pressure hydraulic fluid formed in the pressure chamber between the piston and the cover end during stroke end operation There is provided a hydraulic cylinder cushion device, characterized in that a throttle flow path is formed at the cover end.

According to an embodiment of the present invention as described above, first, in the cylinder with a plunger-type cushion as a throttle mechanism for cushion formation, the throttle flow path has less spatial constraints and sufficiently secures a thickness in strength phase. Its better performance is achieved even when exposed to excessive cushion pressure.

Second, when used in parallel with the existing cushion system, the combination of the plunger type cushions such as step-taper type, taper-taper type, inverted parabolic-taper type, etc., which are difficult to implement in the conventional plunger, and combinations with various notch shapes formed on the cover end side It is possible to expect better cushioning performance.

Third, when the cover end and the plunger are applied in parallel, the length of the plunger can be shortened while maintaining the same performance as in the prior art.

Hereinafter, a preferred embodiment of a hydraulic cylinder cushion device according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

In addition, the following examples are not intended to limit the scope of the present invention, but merely illustrative of the components set forth in the claims of the present invention, which are included in the technical spirit throughout the specification of the present invention and constitute the claims Embodiments that include a substitutable component as an equivalent in the element may be included in the scope of the present invention.

1 is a cross-sectional view showing a conventional hydraulic cylinder cushion device, a partial cross-sectional view showing a state in which the plunger has entered the conventional cover end, and a cross-sectional view showing a conventional plunger, Figure 2 according to an embodiment of the present invention 3 is a cross-sectional view showing a hydraulic cylinder cushion device, Figure 3 is a cross-sectional view showing a hydraulic cylinder cushion device according to another embodiment of the present invention, Figure 4 is a throttle flow path shape of the hydraulic cylinder cushion device according to another embodiment of the present invention A partial cross-sectional view is shown.

Hydraulic cylinder cushion device according to a preferred embodiment of the present invention, the high-pressure hydraulic fluid is formed in the pressure chamber between the piston and the cover end 30 when the rod 20 reciprocates in the cylinder tube 10 and the stroke end operation In the hydraulic cylinder cushion device installed in the hydraulic cylinder for discharging the discharge, the cover end 30, the throttle passage 31 is formed.

Since the tube 10 guides the movement of the piston as an outer part of the cylinder, sliding of the piston takes place and internal pressure is required, so pressure resistance and wear resistance are required. In order to increase the mechanical performance, the inner surface of the tube is polished to a surface roughness of 1.6S or less. As a tube material, aluminum tubes, rolled steel tubes for mechanical structures, brass tubes, etc. have been generally used, but recently, stainless steel tubes or plastic tubes are also used for small cylinders.

Since the hydraulic cylinder used for heavy equipment moves a heavy load, the piston 40 collides with the cover end 30 during stroke end operation to generate a mechanical shock. To alleviate this shock, a hydraulic cylinder cushion device is required to smoothly operate the cylinder at high speed and high load.

The hydraulic cylinder cushioning device absorbs the shock when the piston 40 collides with the cover end 30, extends the hydraulic cylinder life, and is used for the equipment and piping of the hydraulic device due to vibration generated by the shock. Prevent damage.

As shown in FIG. 1, in the related art, a hydraulic cylinder cushion device having a throttle passage formed on a plunger has been used, but in this manner, various throttle passages are difficult to form due to limitations in size and strength of the plunger.

As shown in FIG. 2, the hydraulic cylinder cushion device of the present invention forms an throttle passage 31 on the cover end 30. Instead of forming an throttling circuit in the plunger 50, the throttling flow path 31 is formed in the cover end 30 itself, which has a small space constraint and can secure a sufficient thickness in strength, so that even when exposed to excessive pressure, a better cushion is provided. Perform the function.

In the hydraulic cylinder cushioning apparatus according to the preferred embodiment of the present invention, the throttle flow passage 31 includes any one or all or a combination of any of linear, tapered, stepped, and parabolic.

As shown in FIG. 4, the throttle flow path 31 formed in the cover end 30 is straight, tapered, stepped, and parabolic or a combination thereof. In the related art, the throttle flow passage 31 is formed in the cushioning ring 50, so that it is difficult to form the throttle flow passage 31 having various shapes.

In FIG. 4, the throttle flow path 31 of four shapes corresponding to a step type | mold, a taper type | mold, a step-taper type | mold, and a parabolic type is shown by way of example. In addition to the shape shown in Figure 4 it can be implemented a variety of throttle flow path 31, such as step-parabolic, tapered-parabolic.

In the hydraulic cylinder cushion device according to a preferred embodiment of the present invention, the throttle passage 31 is formed with one or more notches of U or V shape.

It is possible to additionally form a notch in the throttle flow passage 31 of the various shapes. Notches such as U or V shapes can be formed, and other notches of various curved surfaces can be formed in combination.

Better cushioning performance can be expected through the first combination of various shapes, such as stepped, tapered, and parabolic, and the second combination of various curved notches.

In the hydraulic cylinder cushion device according to an embodiment of the present invention, when the piston 40 is moved toward the cover end 30, the piston 40 and the cover end 30 is prevented from sudden collision A plunger 50 is further formed on the outer circumferential surface of the rod 20 on the cover end 30 to generate a buffer pressure.

The cushioning device of the present invention can be used in parallel with the existing cushioning system, and in this case, a combination with various notch shapes configured on the cover end 30 together with the conventional plunger type cushion can be expected, and thus better cushioning performance can be expected. .

The hydraulic cylinder of the present invention performs a reciprocating motion within a predetermined stroke within the cylinder tube 10 in accordance with the supply of hydraulic oil, and a high pressure generated in the stroke end operation of the piston 40 approaching the cover end 30. The plunger 50 is mounted to the end of the cover end 30 side rod 20 in order to alleviate the impact caused by the working oil, and the throttle flow passage 31 having various shapes is formed in the cover end 30.

3 shows an example of a combination of the plunger 50 and the cover end 30 in which the notches are not formed.

In the hydraulic cylinder cushion device according to a preferred embodiment of the present invention, the plunger 50 is formed with one or more notches of U or V shape.

In the plunger 50 of the present invention, a notch such as a U or V shape can be formed, and other notches of various curved surfaces can be formed in combination. In addition, it is also possible to form the plunger 50 of the shape which combined linear form, step form, taper form, and parabolic form.

In this case, it is possible to select a variety of shapes and notches for both the cover end 30 and the plunger 50, it is possible to design a cushioning device applicable to various use environments.

3 shows an example of the combination of the plunger 50 and the cover end 30 in which the notches are formed.

In the hydraulic cylinder cushion device according to an embodiment of the present invention, when the piston 40 is moved toward the cover end 30, the piston 40 and the cover end 30 is prevented from sudden collision The plunger 50 is further formed integrally with the rod 20 on the side of the cover end 30 to generate a buffer pressure.

It is possible to form the plunger 50 of the present invention as a rod 20 integrally. Conventionally, the plunger and the rod are formed of different materials, and plastic deformation of the cushioning occurs due to the influence of a sudden sudden operation, an increase in speed, and other abnormal external forces during long time use, causing a failure in the entire cylinder.

In order to solve this problem, it is possible to replace the plunger 50 with the rod 20 integral bar. The rod 20 is required to have sufficient strength and wear resistance to withstand loads such as tension, compression, bending, vibration, etc. according to the applied load, and the material is hard chromium plated to improve corrosion resistance and abrasion resistance in the carbon steel for mechanical structure. However, stainless steel may be used as a special use.

Even when the rod 20 integrated bar is applied instead of the conventional plunger, various throttle flow passages 31 are formed on the cover end 30 to achieve desired cushioning performance.

3 shows an example of a combination of the rod 20 integrated bar and the cover end 30 as an example.

1 is a cross-sectional view showing a conventional hydraulic cylinder cushion device, a partial cross-sectional view showing a state in which the plunger has entered the conventional cover end, and a cross-sectional view showing a conventional plunger,

2 is a cross-sectional view showing a hydraulic cylinder cushion device according to an embodiment of the present invention;

3 is a cross-sectional view showing a hydraulic cylinder cushion device according to another embodiment of the present invention;

Figure 4 is a partial cross-sectional view showing the shape of the throttle flow path of the hydraulic cylinder cushion device according to another embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: tube

20: load

30: cover end, 31: throttle passage

40: piston

50: plunger

Claims (6)

In the hydraulic cylinder cushioning device which is installed in the hydraulic cylinder that the rod reciprocates in the cylinder tube and discharges the high-pressure hydraulic oil formed in the pressure chamber between the piston and the cover end during stroke end operation. Hydraulic cylinder cushion device characterized in that the throttle flow path is formed in the cover end. The method of claim 1, The throttle flow passage includes a hydraulic cylinder cushion device including any one or a combination of all or part of a straight line, a tapered type, a stepped type, and a parabolic type. The method of claim 2, Hydraulic cylinder cushioning device characterized in that at least one notch of the U or V shape is formed in the throttle passage. 4. The method according to any one of claims 1 to 3, And a plunger inserted into one end of the cover end side rod to generate a buffer pressure to prevent the piston and the cover end from colliding suddenly when the piston is moved to the cover end side. Hydraulic cylinder cushion device. The method of claim 4, wherein Hydraulic cylinder cushioning device characterized in that the plunger is formed with any one or more notches of U or V shape. 4. The method according to any one of claims 1 to 3, And a plunger integrally formed with the cover end side rod to generate a buffer pressure that prevents the piston and the cover end from colliding rapidly when the piston is moved to the cover end side. Hydraulic cylinder cushion device.
KR1020090098520A 2009-10-16 2009-10-16 Hydraulic cylinder cushion device in cover end KR20110041610A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020090098520A KR20110041610A (en) 2009-10-16 2009-10-16 Hydraulic cylinder cushion device in cover end

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090098520A KR20110041610A (en) 2009-10-16 2009-10-16 Hydraulic cylinder cushion device in cover end

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KR20110041610A true KR20110041610A (en) 2011-04-22

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KR1020090098520A KR20110041610A (en) 2009-10-16 2009-10-16 Hydraulic cylinder cushion device in cover end

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013103166A1 (en) * 2012-01-05 2013-07-11 볼보 컨스트럭션 이큅먼트 에이비 Cylinder cushion device for construction machine
CN112943738A (en) * 2021-02-04 2021-06-11 张嘉乐 Constant throttling type buffer structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013103166A1 (en) * 2012-01-05 2013-07-11 볼보 컨스트럭션 이큅먼트 에이비 Cylinder cushion device for construction machine
CN112943738A (en) * 2021-02-04 2021-06-11 张嘉乐 Constant throttling type buffer structure

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