KR20110041609A - Hydraulic cylinder cushion device in head cover - Google Patents

Hydraulic cylinder cushion device in head cover Download PDF

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Publication number
KR20110041609A
KR20110041609A KR1020090098519A KR20090098519A KR20110041609A KR 20110041609 A KR20110041609 A KR 20110041609A KR 1020090098519 A KR1020090098519 A KR 1020090098519A KR 20090098519 A KR20090098519 A KR 20090098519A KR 20110041609 A KR20110041609 A KR 20110041609A
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KR
South Korea
Prior art keywords
hydraulic cylinder
head cover
cushioning
piston
cushion
Prior art date
Application number
KR1020090098519A
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 KR1020090098519A priority Critical patent/KR20110041609A/en
Publication of KR20110041609A publication Critical patent/KR20110041609A/en

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    • 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
    • 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
    • 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
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/755—Control of acceleration or deceleration of the output member

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Abstract

The present invention relates to a hydraulic cylinder cushion device, according to an embodiment of the present invention, the rod reciprocates in the cylinder tube and discharges the high-pressure hydraulic fluid formed in the pressure chamber between the piston and the head cover during stroke end operation In the hydraulic cylinder cushion device installed in the hydraulic cylinder, there is provided a hydraulic cylinder cushion device characterized in that the throttle flow path is formed in the head cover.

Description

Hydraulic cylinder cushion device in head cover

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 header cover.

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 cushioning ring to absorb mechanical shock at the piston and stroke end.

1 shows a situation in which the cushioning rushes to the head cover and a representative shape of the cushioning.

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 this sudden increase in pressure, the conventional method is to smooth the flow path by slowly throttling the notch of a specific shape on the surface of the cushioning into a straight, tapered, inverted parabolic, compound orifice, and step shape. It has been aimed at reducing deceleration and impact force.

However, in the actual cushioning type (cushion ring type) is limited by the limitation of the thickness or size (notation) to the formation of the notch. In particular, if the area of the notch is excessive, the weakness of the cushioning may occur, and the thickness or size of the cushioning should be reinforced, but some cushioning performances may be approached by downgrading some cushioning performances due to the overall constraints, and the relative to which the cushion is mounted. Although the outer diameter of the rod side is reduced to reinforce the cushion, in this case, the rod-side cushion end has a relatively small diameter, which may cause a problem in that the overall cylinder strength is disadvantageous.

In addition, in case of ring type cushion, it may cause expansion of the cylinder due to short-time plastic deformation due to the additional attachment of a specific purpose or the sudden sudden operation, speed increase and other abnormal external force. Occurs.

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 head cover.

According to a preferred embodiment of the present invention, the rod is a hydraulic cylinder cushioning device installed in the hydraulic cylinder for reciprocating in the cylinder tube and discharging the high-pressure hydraulic oil formed in the pressure chamber between the piston and the head cover during stroke end operation There is provided a hydraulic cylinder cushion device, wherein an throttle flow passage is formed in the head cover.

According to an embodiment of the present invention as described above, first, as a throttling mechanism for forming a cushion, in a cylinder in which a ring-type cushion is built, the throttle flow path has less spatial constraints and has sufficient strength in thickness. Its better performance is achieved even when exposed to excessive cushion pressure.

Second, when used in parallel with the existing cushioning system, it is combined with various notch shapes formed on the head cover side along with ring type cushions such as step-taper type, taper-taper type, and inverted parabolic-taper type, which are difficult to implement in conventional cushioning. This enables better cushioning performance.

Third, when the head cover and the cushioning are applied in parallel, the length of the cushioning 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 cushioning has entered the conventional head cover, and a cross-sectional view showing a conventional cushioning, Figure 2 is 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 an throttle passage of the hydraulic cylinder cushion device according to another embodiment of the present invention A partial cross-sectional view showing the shape.

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 head cover 30 when the rod 20 is reciprocated 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 throttle passage 31 is formed in the head cover (30).

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 head cover 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 shock when the piston 40 collides with the head cover 30, extends the hydraulic cylinder life, and also provides equipment or piping for hydraulic devices due to vibration generated by shock. Prevent damage.

As shown in FIG. 1, in the related art, a hydraulic cylinder cushion device of a method of forming a throttle flow path in a cushioning ring is used, but in this manner, it is difficult to form various throttle flow paths due to limitations in the size and strength of the cushion ring. have.

As shown in FIG. 2, the hydraulic cylinder cushion device of the present invention forms an throttle flow passage 31 in the head cover 30. Instead of forming the throttling circuit in the cushioning ring 50, the throttling flow passage 31 is formed in the head cover 30 itself, which has less spatial constraints and is sufficiently secured in strength, so that even when exposed to excessive pressure, Perform a cushion 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 head cover 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 the preferred embodiment of the present invention, when the piston 40 is moved to the head cover 30 side, the piston 40 and the head cover 30 is prevented from sudden collision The cushion ring 50 is further formed on the outer circumferential surface of the rod 20 so as to generate a cushioning 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 head cover 30 side together with the conventional ring 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 the hydraulic oil, and high pressure generated in the stroke end operation of the piston 40 approaching the head cover 30. The cushion ring 50 is mounted to the rod 20 end of the piston 40 in order to alleviate the impact caused by the working oil, and the head cover 30 is formed with a throttle flow passage 31 having various shapes.

3 shows an example of a combination of the cushioning 50 and the head cover 30 where the notches are not formed. The cushioning ring 50 may be formed to be fixed to the rod 20 to move together with the rod 20.

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

In the cushioning ring 50 of the present invention, a notch such as a U or V shape may be formed, and other notches of various curved surfaces may be formed in combination. In addition, it is also possible to form the cushioning ring 50 in the form of a combination of a straight, stepped, tapered, and parabolic shapes.

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

3 shows a combination of the notch-formed cushioning ring 50 and the head cover 30 as an example.

In the hydraulic cylinder cushion device according to the preferred embodiment of the present invention, when the piston 40 is moved to the head cover 30 side, the piston 40 and the head cover 30 is prevented from sudden collision The cushion ring 50 is formed to be integrally formed with the outer circumferential surface of the rod 20 to generate a buffer pressure.

It is possible to form the cushioning ring 50 of the present invention integrally with the rod 20. Conventionally, cushioning is made of polycarbonate made of synthetic resin, and plastic deformation of the cushioning occurs due to the sudden use of the product for a long time, instantaneous sudden action, speed increase, or other abnormal external force, which causes the entire cylinder to fail. Occurs.

In order to solve this problem, it is possible to replace the cushioning ring 50 with a bar 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 cushioning, various throttle flow passages 31 may be formed in the head cover 30 to achieve desired cushioning performance.

3 shows an example of a combination of the rod 20 integrated bar and the head cover 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 cushioning has entered the conventional head cover, and a cross-sectional view showing a conventional cushioning,

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: head cover, 31: throttle flow path

40: piston

50: cushioning

Claims (6)

In the hydraulic cylinder cushioning device which is installed in the hydraulic cylinder reciprocating in the cylinder tube and discharging the high-pressure hydraulic oil formed in the pressure chamber between the piston and the head cover during stroke end operation, Hydraulic cylinder cushioning device characterized in that the throttle flow path is formed in the head cover. 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, Hydraulic cylinder cushion, characterized in that it further comprises a cushioning formed on the outer peripheral surface of the rod to generate a buffer pressure to prevent the piston and the head cover from colliding rapidly when the piston is moved to the head cover side Device. The method of claim 4, wherein Hydraulic cushion device, characterized in that the cushioning is formed with any one or more notches of the U or V shape. 4. The method according to any one of claims 1 to 3, And further comprising a cushioning formed integrally with the outer circumferential surface of the rod so as to generate a buffer pressure that prevents the piston and the head cover from colliding sharply when the piston is moved to the head cover side. Cylinder Cushion.
KR1020090098519A 2009-10-16 2009-10-16 Hydraulic cylinder cushion device in head cover KR20110041609A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020090098519A KR20110041609A (en) 2009-10-16 2009-10-16 Hydraulic cylinder cushion device in head cover

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090098519A KR20110041609A (en) 2009-10-16 2009-10-16 Hydraulic cylinder cushion device in head cover

Publications (1)

Publication Number Publication Date
KR20110041609A true KR20110041609A (en) 2011-04-22

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KR1020090098519A KR20110041609A (en) 2009-10-16 2009-10-16 Hydraulic cylinder cushion device in head cover

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