KR20130139110A - Rod cover for hydraulic cylinder - Google Patents

Rod cover for hydraulic cylinder Download PDF

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Publication number
KR20130139110A
KR20130139110A KR1020120062866A KR20120062866A KR20130139110A KR 20130139110 A KR20130139110 A KR 20130139110A KR 1020120062866 A KR1020120062866 A KR 1020120062866A KR 20120062866 A KR20120062866 A KR 20120062866A KR 20130139110 A KR20130139110 A KR 20130139110A
Authority
KR
South Korea
Prior art keywords
rod cover
rod
cylinder
hydraulic cylinder
oil
Prior art date
Application number
KR1020120062866A
Other languages
Korean (ko)
Inventor
손승목
김영택
Original Assignee
동양기전 주식회사
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 동양기전 주식회사 filed Critical 동양기전 주식회사
Priority to KR1020120062866A priority Critical patent/KR20130139110A/en
Publication of KR20130139110A publication Critical patent/KR20130139110A/en

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Classifications

    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/061—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with positioning means
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/062—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces characterised by the geometry of the seat
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/20—Rings with special cross-section; Oil-scraping rings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/935—Seal made of a particular material
    • Y10S277/944—Elastomer or plastic
    • Y10S277/945—Containing fluorine
    • Y10S277/946—PTFE

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

Abstract

The hydraulic cylinder rod cover according to the present invention is an element constituting the hydraulic cylinder device, is fixed to one end of the hollow cylinder, provided with a through hole for penetrating the rod, and a plurality of seal members along the inner circumferential surface of the through hole. Claims [1] A rod cover comprising: an oil packing (U-packing) accommodated in a first accommodating portion formed concave on an inner circumferential surface of the rod cover and arranged to slide in contact with an outer circumferential surface of a rod; A dust wiper disposed away from the cylinder with respect to the oil packing to block foreign matter from entering the rod cover from the outside of the rod cover; And a buffer chamber disposed on a side close to the cylinder based on the oil packing to cushion an impact generated during operation of the rod. It characterized in that it comprises a; dust ring to block the flow into the rod cover.

Description

Rod cover for hydraulic cylinder

The present invention relates to a hydraulic cylinder device.

In general, a hydraulic cylinder uses a hydraulic force generated by a hydraulic pump to inject a fluid into the cylinder. When the piston moves by pushing the piston with the applied hydraulic force, the piston receives the movement of the piston and generates a mechanical reciprocating motion. It is a kind of important mechanical element.

Such hydraulic cylinder devices are widely used in forklifts, excavators, etc., as well as aerial work trucks, which are used for working from high above the ground.

Since the hydraulic cylinder device has a structure in which the piston and the rod move by the pressure of the oil filled in the cylinder, various seals are provided so that the oil filled in the cylinder does not leak to the outside during the operation of the hydraulic cylinder device.

In particular, the member generating a force to the outside by the oil filled in the cylinder is a rod. The rod cover is a component installed at one end of the cylinder so that such a rod can be smoothly moved between the inside and the outside of the cylinder. An example of a hydraulic cylinder device having such a component is disclosed in Korean Utility Model Registration No. 0146484.

1 is a view schematically showing the structure of a general hydraulic cylinder device. 2 is a view showing the structure of the rod cover employed in the hydraulic cylinder device shown in FIG. FIG. 3 is a partial cutaway view illustrating a structure of the rod cover illustrated in FIG. 2 in three dimensions. In FIG. 1, the rod cover 1 indicated in parentheses and the rod cover 10 indicated outside the parentheses are marked to identify the conventional rod cover 10 and the rod cover 10 according to the present invention.

1 to 3, a plurality of sealing members accommodated in the accommodating part 5 formed in the inner circumferential surface are coupled to the conventional rod cover 1. That is, the oil packing 2 (U-packing), which is a main sealing member, is provided to prevent oil from leaking between the inside and the outside of the cylinder 110. In addition, the dust wiper 4 disposed on the side away from the cylinder 110 on the basis of the oil packing 2 has foreign substances introduced into the cylinder 110 from the outside of the cylinder 110 during the operation of the rod 120. It prevents it from becoming. In addition, the buffer seal 6 disposed on the side closer to the cylinder 110 based on the oil packing 2 buffers an impact caused by oil when the rod 120 operates, and contacts the sliding portion while sliding. It suppresses excessive rise in temperature and reduces frictional resistance. However, a structure such as the rod cover 1 illustrated in FIGS. 1 to 3 has a problem that foreign matters generated in the cylinder 110 may flow into the rod cover 1. As such, when foreign matter generated in the cylinder 110 flows into the rod cover 1, the oil packing 2 may be damaged, and a serious problem may occur in which oil flows out of the hydraulic cylinder device.

An object of the present invention is to devise to solve the above problems, to improve the arrangement structure of the various seal members provided in the rod cover constituting the hydraulic cylinder device to block the foreign matter generated in the cylinder to the rod cover side Therefore, the present invention provides a rod cover for a hydraulic cylinder in which oil does not leak out of the hydraulic cylinder device.

In order to achieve the above object, the rod cover for a hydraulic cylinder according to an embodiment of the present invention is an element constituting a hydraulic cylinder device,

In the rod cover is fixed to one end of the hollow cylinder, the through hole is provided so that the rod penetrates, the rod cover having a plurality of seal members along the inner peripheral surface of the through hole,

U-packing is accommodated in the first accommodating portion formed in the inner circumferential surface of the rod cover and arranged in sliding contact with the outer circumferential surface of the rod;

A dust wiper disposed away from the cylinder with respect to the oil packing to block foreign matter from entering the rod cover from the outside of the rod cover; And

And a buffer seal disposed on a side of the cylinder close to the oil packing to cushion shock generated during operation of the rod.

And a dust ring disposed on the cylinder side with respect to the buffer chamber to block foreign substances generated in the cylinder from being introduced into the rod cover.

The dust ring is preferably provided with an oil groove for preventing back pressure generation on the side of the dust ring.

The back pressure generation prevention oil groove is preferably provided with a pair disposed symmetrically to each other.

Preferably, the oil pressure preventing groove is disposed at 180 ° intervals along the circumference of the dust ring.

The dust ring is preferably manufactured by mixing carbon fiber and polytetrafluoroethylene.

The hydraulic cylinder rod cover according to the present invention includes a dust ring in the arrangement structure of the various seal members provided in the rod cover constituting the hydraulic cylinder device, to prevent foreign substances generated in the cylinder from entering the rod cover. Providing a rod cover for a hydraulic cylinder in which oil does not leak outside the hydraulic cylinder device has the effect of significantly increasing the durability of the hydraulic cylinder device.

1 is a view schematically showing the structure of a general hydraulic cylinder device.
2 is a view showing the structure of the rod cover employed in the hydraulic cylinder device shown in FIG.
FIG. 3 is a partial cutaway view illustrating a structure of the rod cover illustrated in FIG. 2 in three dimensions.
4 is a view illustrating a structure of a rod cover according to an exemplary embodiment of the present invention.
FIG. 5 is a partial cutaway view showing in three dimensions the structure of the rod cover shown in FIG. 4.
6 and 7 are views for explaining the structure of the dust seal shown in FIG.

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

1 is a view schematically showing the structure of a general hydraulic cylinder device. 4 is a view illustrating a structure of a rod cover according to an exemplary embodiment of the present invention. FIG. 5 is a partial cutaway view showing in three dimensions the structure of the rod cover shown in FIG. 4. 6 and 7 are views for explaining the structure of the dust seal shown in FIG.

1 and 4 to 7, the rod cover 10 (hereinafter referred to as “rod cover”) for a hydraulic cylinder according to a preferred embodiment of the present invention is a body constituting the hydraulic cylinder device 100 as a body. 20, u-packing 30, dust wiper 40, buffer seal 50, and dust ring 60 are included.

The body 20 is a frame constituting the rod cover 10. The body 20 is fixed to one end of the cylinder 110 by welding, bolting, interference fitting, or the like. The cylinder 110 is a hollow member. The piston and the rod 120 is installed inside the cylinder 110. Oil is filled in the cylinder 110 so that the rod 120 is moved by the pressure of the oil. The center of the body 20 is provided with a through hole 21 formed to penetrate the length of the body 20 along the longitudinal direction of the body 20. The through hole 21 is connected to the hollow formed in the cylinder (110). The through hole 21 is disposed to penetrate the rod 120. The inner circumferential surface of the through hole 21 includes a plurality of seal members sequentially disposed along the longitudinal direction of the through hole 21. A plurality of recessed grooves are provided on the inner circumferential surface of the through hole 21 to accommodate the seal members. More specifically, the groove portion may sequentially include the second accommodating portion 24, the first accommodating portion 22, and the third accommodating portion in a direction closer to the cylinder 110 from the outside of the rod cover 10. 26 and the dust ring receiving portion 28. The grooves have a depth of about 2.5 mm to about 4 mm. The depths of the grooves are formed to correspond to the thicknesses of the seal member, that is, the oil packing 30, the dust wiper 40, the buffer seal, and the dust ring 60, which will be described later. The depth of the grooves is machined to have a processing tolerance larger than the thickness of the seal member.

The seal member includes a milk packing 30, a dust wiper 40, a buffer seal 50, and a dust ring 60.

The milk packing 30 is accommodated in the first accommodating part 22 formed concave on the inner circumferential surface of the rod cover 10. The milk packing 30 is a seal member made of an annular shape. The thickness of the milk packing 30 is formed about 2.5mm to 4mm. The outer diameter of the oil packing 30 is processed to have a processing tolerance smaller than the dimension of the inner circumferential surface of the first accommodating portion 22. The milk packing 30 is disposed to be in sliding contact with the outer circumferential surface of the rod 120. The oil packing 30 may be made of, for example, a material such as polyurethane or nitrile butadiene rubber (NBR). The milk packing 30 may be slightly elastically deformed according to the properties of the material. The oil packing 30 is a seal member that prevents oil in the cylinder 110 from leaking to the outside of the hydraulic cylinder device 100.

The dust wiper 40 is accommodated in the second accommodating part 24. That is, the dust wiper 40 is disposed away from the cylinder 110 with respect to the oil packing 30. The dust wiper 40 serves to block foreign matter from entering the rod cover 10 from the outside of the rod cover 10. The dust wiper 40 is an annular seal member. The dust wiper 40 has a thickness of about 2.5mm to 4mm. The outer diameter of the dust wiper 40 is processed to have a processing tolerance smaller than the dimension of the inner circumferential surface of the second accommodation portion 24. The dust wiper 40 is disposed in sliding contact with the outer circumferential surface of the rod 120. The dust wiper 40 may be made of a material such as polyurethane. The dust wiper 40 may be slightly elastically deformed according to the properties of the material.

The buffer chamber 50 is accommodated in the third accommodating part 26. That is, the buffer chamber 50 is disposed on the side close to the cylinder 110 on the basis of the milk packing 30. The buffer chamber 50 buffers an impact generated during the operation of the rod 120, and suppresses excessive increase in the temperature of the sliding portion in contact with the rod and reduces frictional resistance. The buffer chamber 50 may be made of a material such as polyurethane. The buffer chamber 50 may be slightly elastically deformed according to the properties of the material. The buffer chamber 50 has a thickness of about 2.5 mm to about 4 mm. The outer diameter of the buffer chamber 50 is processed to have a processing tolerance smaller than the dimension of the inner circumferential surface of the third accommodation portion 26. The buffer chamber 50 is disposed in sliding contact with the outer circumferential surface of the rod 120.

The dust ring 60 is a component that expresses the essential working effects of the present invention. The dust ring 60 is accommodated in the dust ring receiving portion 28. That is, the dust ring 60 is disposed closer to the cylinder 110 with respect to the buffer chamber 50. The dust ring 60 serves to block foreign matter generated in the cylinder 110 from flowing into the rod cover 10. The dust ring 60 is an annular seal member. The dust ring 60 has a thickness of about 2.5 mm to about 4 mm. The outer diameter of the dust ring 60 is machined to have a processing tolerance smaller than the dimension of the inner circumferential surface of the dust ring receiving portion 28. The dust ring 60 is disposed in sliding contact with the outer circumferential surface of the rod 120. The dust ring 60 is preferably manufactured by mixing carbon fiber and polytetrafluoroethylene. The dust ring 60 should have sufficient friction durability when sliding with the rod 120. As the material capable of securing such friction durability, the carbon fiber and polytetrafluoroethylene are mixed. Material may be employed. The dust ring 60 is preferably provided with an oil groove 62 for preventing back pressure generation as shown in FIGS. 6 and 7 on the side of the dust ring 60. As shown in FIG. 7, the back pressure generation preventing oil groove 62 may be provided with a pair symmetrically disposed on both sides of the dust ring 60. Meanwhile, as illustrated in FIG. 6, the oil groove 62 for preventing back pressure generation may be disposed at 180 ° intervals along the circumference of the dust ring 60. The back pressure generation preventing oil groove 62 serves to secure a flow path of oil to prevent back pressure from being generated by the dust ring 60 during the operation of the rod 120. That is, the oil groove 62 for preventing back pressure generation is provided so that the dust ring 60 does not interfere with the operation of the rod 120 during the operation of the rod 120. In particular, the formation direction of the oil pressure groove 62 for preventing back pressure generation is formed in the radial direction of the dust ring 60. The reason why the formation direction of the back pressure generation preventing oil groove 62 is formed in the radial direction of the dust ring 60 is that foreign matters generated inside the cylinder through the back pressure generation preventing oil groove 62 are formed in the rod cover 10. It is to prevent the dust ring 60 from being damaged by the pressure of the oil at the same time to prevent the entry into the inside.

Hereinafter, the effect of the hydraulic cylinder rod cover 10 having the configuration as described above will be described in detail.

First, the seal members are assembled to the body 20. That is, as described above, the body 20 includes a second accommodating part 24, a first accommodating part 22, a third accommodating part 26, and a dust ring accommodating part 28. 20 are sequentially formed along the inner circumferential surface of the through hole 21. The dust wiper 40 is accommodated in the second accommodating part 24. Since the dust wiper 40 is made of a material capable of elastic deformation, elastic wiper 40 may be elastically deformed by an external force that can act as a human finger. Therefore, the dust wiper 40 may be accommodated in the second accommodating part 24 by pushing an appropriate external force into the through hole 21. In this manner, the oil packing 30 is accommodated in the first accommodating part 22. The buffer chamber 50 is accommodated in the third accommodating part 26. The dust ring 60 is received in the dust ring receiving portion 28 in a similar manner. The hydraulic cylinder rod cover 10 assembled as described above is fixed to one end of the cylinder 110 by welding, bolting, interference fitting, or the like in a state of being coupled with the rod 120.

Thus comprising a rod cover 10 assembled to the cylinder 110, the other hydraulic cylinder components are assembled to complete the hydraulic cylinder device 100 as shown in FIG. By supplying oil to the hydraulic cylinder device 100, the rod 120 can be sunk outside the rod cover 10. When the rod 120 repeats the operation of hauling along the through hole 21 provided in the rod cover 10, foreign matter such as dust may be formed on the surface of the rod 120 protruding outside the rod cover 10. Is attached. Such foreign matters are blocked from being introduced into the rod cover 10 by the dust wiper 40 while the rod 120 is immersed into the rod cover 10. On the other hand, as the rod 120 reciprocates in the cylinder 110, foreign matter may occur due to friction between oil and the cylinder 110 in the cylinder 110. Such foreign matters are blocked from flowing into the rod cover 10 by the dust ring 60. In this process, the back pressure generation oil groove 62 provides a flow path of oil to block the operation of the rod 120 by the dust ring 60.

As described above, the rod cover for a hydraulic cylinder according to the present invention is provided with a dust ring to prevent foreign substances generated in the cylinder from flowing into the rod cover, thereby preventing foreign substances from entering the rod cover from the outside of the cylinder unlike the conventional hydraulic cylinder device. In addition, by blocking foreign substances generated in the cylinder from entering the rod cover, the hydraulic cylinder device provides an effect of remarkably improving durability.

While the present invention has been described with reference to the preferred embodiments, it is to be understood that the invention is not to be limited by the example, and various changes and modifications may be made without departing from the spirit and scope of the invention.

10: rod cover for hydraulic cylinder 20: body
21: through hole 22: the first accommodating part
24: second accommodating part 26: third accommodating part
28 dust ring housing 30 oil packing
40: dust wiper 50: buffer seal
60: dust ring 62: oil groove for preventing back pressure generation
100: hydraulic cylinder device 110: cylinder
120: load

Claims (5)

As a component of the hydraulic cylinder device,
In the rod cover is fixed to one end of the hollow cylinder, the through hole is provided so that the rod penetrates, the rod cover having a plurality of seal members along the inner peripheral surface of the through hole,
U-packing is accommodated in the first accommodating portion formed in the inner circumferential surface of the rod cover and arranged in sliding contact with the outer circumferential surface of the rod;
A dust wiper disposed away from the cylinder with respect to the oil packing to block foreign matter from entering the rod cover from the outside of the rod cover; And
And a buffer seal disposed on a side of the cylinder close to the oil packing to cushion shock generated during operation of the rod.
And a dust ring disposed on the cylinder side with respect to the buffer chamber to block foreign substances generated in the cylinder from flowing into the rod cover. The method of claim 1,
The dust ring is a hydraulic cylinder rod cover, characterized in that the oil groove for preventing the occurrence of back pressure is provided on the side of the dust ring. 3. The method of claim 2,
The oil pressure preventing groove grooves are provided with a pair of symmetrically arranged to each other rod cover for a hydraulic cylinder. 3. The method of claim 2,
The oil pressure preventing groove for preventing back pressure generation is disposed at 180 ° intervals along the circumference of the dust ring. The method of claim 1,
The dust ring is a hydraulic cylinder rod cover, characterized in that manufactured by mixing carbon fiber and polytetrafluoroethylene.
KR1020120062866A 2012-06-12 2012-06-12 Rod cover for hydraulic cylinder KR20130139110A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120062866A KR20130139110A (en) 2012-06-12 2012-06-12 Rod cover for hydraulic cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120062866A KR20130139110A (en) 2012-06-12 2012-06-12 Rod cover for hydraulic cylinder

Publications (1)

Publication Number Publication Date
KR20130139110A true KR20130139110A (en) 2013-12-20

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104727006A (en) * 2015-04-14 2015-06-24 刘青建 Hydraulic type springback device of loom
CN108691847A (en) * 2018-06-21 2018-10-23 安徽森米诺农业科技有限公司 Piston rod for foodstuff drying device pressure cylinder
KR102153083B1 (en) * 2019-05-03 2020-09-07 주식회사 동일산업 Hydraulic cylinder
CN114109960A (en) * 2021-11-09 2022-03-01 刘铁军 Anti-leakage hollow plunger hydraulic oil cylinder

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104727006A (en) * 2015-04-14 2015-06-24 刘青建 Hydraulic type springback device of loom
CN108691847A (en) * 2018-06-21 2018-10-23 安徽森米诺农业科技有限公司 Piston rod for foodstuff drying device pressure cylinder
KR102153083B1 (en) * 2019-05-03 2020-09-07 주식회사 동일산업 Hydraulic cylinder
CN114109960A (en) * 2021-11-09 2022-03-01 刘铁军 Anti-leakage hollow plunger hydraulic oil cylinder
CN114109960B (en) * 2021-11-09 2024-05-31 湖北威森博格液压设备有限公司 Leak-proof hollow plunger hydraulic cylinder

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