WO2010018640A1 - Dispositif d'étanchéité pour piston - Google Patents

Dispositif d'étanchéité pour piston Download PDF

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Publication number
WO2010018640A1
WO2010018640A1 PCT/JP2008/064650 JP2008064650W WO2010018640A1 WO 2010018640 A1 WO2010018640 A1 WO 2010018640A1 JP 2008064650 W JP2008064650 W JP 2008064650W WO 2010018640 A1 WO2010018640 A1 WO 2010018640A1
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WO
WIPO (PCT)
Prior art keywords
guide ring
piston
seal
seal groove
main body
Prior art date
Application number
PCT/JP2008/064650
Other languages
English (en)
Japanese (ja)
Inventor
彰 上田
晃広 永野
純一 山下
暢 南
Original Assignee
日本バルカー工業株式会社
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 日本バルカー工業株式会社 filed Critical 日本バルカー工業株式会社
Priority to PCT/JP2008/064650 priority Critical patent/WO2010018640A1/fr
Publication of WO2010018640A1 publication Critical patent/WO2010018640A1/fr

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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
    • F16J15/56—Other sealings for reciprocating rods

Definitions

  • the present invention relates to, for example, a piston seal material, and more particularly, to a piston seal material mounted on a piston that slides in an axial direction on an inner peripheral surface of a hydraulic cylinder.
  • a piston seal material is used to guide the gentle sliding of a piston operated by hydraulic pressure.
  • FIG. 4 is a cross-sectional view showing a relationship between the hydraulic cylinder 4 and the piston 1 on which the conventional piston seal material 2 disclosed in Non-Patent Document 1 is mounted.
  • An annular first seal groove 3 is formed on the outer peripheral surface of the substantially cylindrical piston 1, and a large-diameter second seal groove 5 is formed in communication with the opening end side of the first seal groove 3. . That is, the seal groove of the piston 1 of this embodiment is composed of a large-diameter portion on the inlet side and a small-diameter portion on the inner side.
  • the piston seal material 2 mounted in the seal groove includes a seal material body 6 mounted in the first seal groove 3, and backup rings 8a and 8b disposed at both axial ends of the seal material body 6. And guide rings 10a and 10b mounted between the second seal groove 5 and the first seal groove 3 outside the backup rings 8a and 8b. That is, the piston seal material 2 is composed of five members.
  • the present invention has been made in view of such conventional circumstances, and has an object to provide a piston seal material that has a small number of parts, contributes to cost reduction, and has good mountability and is not easily broken.
  • the piston sealing material according to the present invention for achieving the above object is A cylindrical sealing material main body accommodated in an annular sealing groove formed on the outer peripheral surface of the piston that reciprocates on the inner peripheral surface of the cylinder; In order to prevent the seal material body from protruding from the seal groove, a first guide ring and a second guide ring respectively mounted between both end portions of the seal material body in the axial direction and both side walls of the seal groove.
  • a piston seal material composed of a guide ring, The sealing material main body has a convex portion in which an outer peripheral surface of an axially intermediate portion bulges in a radial direction, and the first guide ring and the second second outer peripheral surface of both axial end portions.
  • the first guide ring and the second guide ring are made of hard resin, and are connected to the cylindrical portion slidably in the axial direction with the inner peripheral surface of the cylinder, and are connected to one end of the cylindrical portion at right angles to the seal. And an inward flange portion that fits into the concave portion of the material main body.
  • the number of parts can be reduced and the cost can be reduced.
  • the concave portion that receives the guide ring is formed in the seal material main body, the guide ring and the seal material main body can maintain a stable posture even when moved by hydraulic pressure.
  • the first guide ring and the second guide ring are made of polyacetal resin reinforced with glass fibers.
  • the axially outer end portions of the first guide ring and the second guide ring is preferably 0.1 mm or less.
  • the first guide ring and the second guide ring are securely mounted in the seal groove, thereby preventing the guide ring from moving in the axial direction. Biting and tearing can be prevented as much as possible.
  • the concave portion of the seal material main body and the tip end portion of the inner flange of the guide ring are configured by a curved surface having a substantially complementary shape, and the radius of the curved surface is set to R, the outside of the piston.
  • R the groove width dimension obtained by subtracting the piston seal groove inner diameter from the diameter
  • R> 1 / 3H is preferred.
  • the piston seal material according to the present invention is inexpensive because the number of parts is small and the shape is not complicated. Moreover, since the number of parts is small, the mountability is also good. Furthermore, since the guide ring is made of a hard resin, the guide ring can exhibit a bearing function. Moreover, since the recessed part used as a receiving of a guide ring is formed in the sealing material main body, the stable state at the time of contact
  • FIG. 1 is a cross-sectional view showing the relationship between a piston fitted with a piston sealing material according to an embodiment of the present invention and a hydraulic cylinder.
  • FIG. 2 is a cross-sectional view of a sealing material body constituting the piston sealing material shown in FIG.
  • FIG. 3 is a half sectional view of a guide ring constituting the piston seal material shown in FIG.
  • FIG. 4 is a cross-sectional view showing a relationship between a piston fitted with a conventional piston seal material and a hydraulic cylinder.
  • FIG. 1 is a cross-sectional view showing a piston and a hydraulic cylinder equipped with a piston sealing material according to an embodiment of the present invention. The same elements as those in FIG.
  • An annular first seal groove 3 is formed on the outer peripheral surface of the substantially cylindrical piston 1, and a large-diameter second seal groove 5 is formed in communication with the opening end side of the first seal groove 3. . That is, the seal groove 7 of the piston 1 of the present embodiment is constituted by the first seal groove 3 and the second seal groove 5.
  • the piston seal material 12 of this embodiment mounted in the seal groove 7 includes a seal material body 14 having a substantially chevron cross section mounted in the first seal groove 3 and both axial ends of the seal material body 14. It is comprised from the guide rings 16a and 16b arrange
  • the seal body 14 is symmetrical in the axial direction, and the guide rings 16a and 16 are formed in the same shape.
  • the piston seal material 12 is not necessarily symmetrical.
  • the piston seal material 12 has a convex portion that bulges in the radial direction (arrow B direction) perpendicular to the axial direction on the outer peripheral surface in the axial direction indicated by the arrow AA ′. 18.
  • the sealing material main body 14 has concave portions 20a and 20b formed in arc shapes at both ends in the axial direction.
  • the sealing material body 14 has small protrusions 22a and 22b and second concave portions 24a and 24b formed on the way from the concave portions 20a and 20b at both ends to the convex portion 18 at the center. Yes. A gap is secured between the small protrusions 22 a and 22 b and the inner peripheral surface 4 a of the cylinder 4. In this way, the clearance around the small protrusions 22a and 22b is secured, so that the sealing material body 14 is prevented from being bitten.
  • the guide ring 16a (16b) has a cylindrical portion 26 that is in sliding contact with the inner peripheral surface 4a of the cylinder 4, and an inner flange portion 28 that is connected at a right angle from the cylindrical portion 26 inward. .
  • a slit is formed in a part of the outer periphery in the axial direction or in a direction inclined obliquely with respect to the axial direction in consideration of the mounting property to the piston 1. Has been. In this way, the guide ring 16a can be expanded in the radial direction through one slit, so that the mounting property to the outer periphery of the piston 1 is improved.
  • the front end portion of the inner flange portion 28 is mounted so as to face the first seal groove 3. Further, the distal end portion of the inner flange portion 28 is formed in a substantially complementary shape corresponding to the concave portion 20 a of the sealing material body 14.
  • the radius R of the arc of the concave portion 20a and the inner flange 28 varies depending on the dimension of the seal groove, as shown in FIG. 1, the radius R is a width dimension obtained by subtracting the seal groove inner diameter from the piston outer diameter.
  • H R> 1 / 3H is preferable. According to the experiment, when the radius R was set to such a dimension, the sealing material body did not break. On the other hand, when the radius R was 28% of H and the condition of R> 1 / 3H was not satisfied, damage to the seal material body was confirmed.
  • the guide rings 16a and 16b are formed of an engineering plastic obtained by reinforcing polyacetal resin (POM) with glass fiber. If the polyacetal resin is reinforced with glass fibers in this way, the deformation of the guide rings 16a and 16b can be prevented as much as possible.
  • POM polyacetal resin
  • the piston seal material 12 including the seal material main body 14, the first guide ring 16a, and the second guide ring 16b is attached to the piston 1 as follows. .
  • the seal body 14 is mounted in the first seal groove 3 of the piston 1.
  • the first guide ring 16a and the second guide ring 16b are expanded by the slits described above, and are mounted on both sides of the seal material main body 14.
  • wearing with guide ring 16a, 16b the clearance gap between slits is sealed.
  • the inner flange portions 28 of the first guide ring 16a and the second guide ring 16b are fitted into the concave portions 20a and 20b of the cylinder body 14, respectively.
  • tip part of the inner flange 28 of the guide rings 16a and 16b is fitted with the recessed parts 20a and 20b of the cylinder main body 14 with substantially no gap.
  • the clearance between the axially outer end of the cylindrical portion 26 and the outer end of the seal groove 5 in the guide rings 16a and 16b is 0. It is preferable that it is 1 mm or less. As described above, if the guide rings 16a and 16b are mounted without gaps in the axial direction of the seal groove, the movement and deformation of the guide rings in the axial direction can be prevented as much as possible. Moreover, this can prevent the sealing material body 14 from being bitten as much as possible.
  • the guide rings 16a and 16b are in contact with the substantially complementary concave portions 20a and 20b, so that they do not protrude from the seal groove 3, and the cylinder body 14 and the guide rings 16a and 16b, etc. There will be no damage. Further, the sealing performance is ensured by the convex portion 18 of the piston seal material 12.
  • the present invention is not limited to this.
  • the arrow A- The present invention can also be applied to a hydraulic cylinder in which the piston 1 moves in the A ′ direction.
  • the seal groove 7 in which the piston seal material 12 is mounted is composed of the two seal grooves 3 and 5, but is not limited to this, and only one seal groove 3 may be provided. That is, the cylindrical portions 26 of the guide rings 16 a and 16 b may be directly attached to the outer peripheral surface of the piston 1 instead of being accommodated in the seal groove 5.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Sealing Devices (AREA)

Abstract

L'invention concerne un dispositif d'étanchéité pour piston qui contribue à la réduction des coûts grâce à la réduction du nombre de composants et qui est moins susceptible de se détacher grâce à l’amélioration de la propriété de montage. Le dispositif d'étanchéité pour piston est composé d'un corps principal de dispositif d'étanchéité cylindrique (14) contenu dans une rainure de joint annulaire (7) formée dans la surface circonférentielle extérieure d'un piston (1) en va-et-vient sur la surface circonférentielle intérieure (4a) d'un cylindre (4) et une première bague de guidage (16a) et une seconde bague de guidage (16b) montées, respectivement, entre les deux extrémités du corps principal de dispositif d'étanchéité (14) dans une direction axiale et les deux parois latérales de la rainure de joint (7) afin d'empêcher le corps principal de dispositif d'étanchéité (14) de faire saillie depuis la rainure de joint (7). Le dispositif d'étanchéité pour piston est caractérisé en ce que le corps principal de dispositif d'étanchéité (14) comporte une partie convexe (18) obtenue en gonflant radialement sa surface circonférentielle extérieure au niveau d’une partie intermédiaire dans une direction axiale et comporte des parties concaves (20a, 20b) pour recevoir la première bague de guidage (16a) et la seconde bague de guidage (16b) formées, respectivement, sur la surface circonférentielle extérieure aux deux extrémités dans la direction axiale, et en ce que la première bague de guidage (16a) et la seconde bague de guidage (16b) comportent des parties cylindriques (26) constituées de résine dure et en contact coulissant avec la surface circonférentielle intérieure (4a) du cylindre (4) dans la direction axiale et des parties de flasque intérieur (28) reliées à angle droit, respectivement, à une extrémité des parties cylindriques (26) pour s'insérer dans les parties concaves (20a, 20b) du corps principal de dispositif d'étanchéité (14).
PCT/JP2008/064650 2008-08-15 2008-08-15 Dispositif d'étanchéité pour piston WO2010018640A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2008/064650 WO2010018640A1 (fr) 2008-08-15 2008-08-15 Dispositif d'étanchéité pour piston

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2008/064650 WO2010018640A1 (fr) 2008-08-15 2008-08-15 Dispositif d'étanchéité pour piston

Publications (1)

Publication Number Publication Date
WO2010018640A1 true WO2010018640A1 (fr) 2010-02-18

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ID=41668794

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/064650 WO2010018640A1 (fr) 2008-08-15 2008-08-15 Dispositif d'étanchéité pour piston

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WO (1) WO2010018640A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011101968B4 (de) 2010-05-19 2022-07-14 Smc Kabushiki Kaisha Fluiddruckvorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5522591U (fr) * 1978-07-31 1980-02-13
JPS6262857A (ja) * 1985-09-13 1987-03-19 Nok Corp 摺動部用材料
JPH01220775A (ja) * 1988-01-21 1989-09-04 Dowty Seals Ltd シール組立体
JPH0253569U (fr) * 1988-06-29 1990-04-18
JP2008080991A (ja) * 2006-09-28 2008-04-10 Toyoda Gosei Co Ltd コラムホールカバー

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5522591U (fr) * 1978-07-31 1980-02-13
JPS6262857A (ja) * 1985-09-13 1987-03-19 Nok Corp 摺動部用材料
JPH01220775A (ja) * 1988-01-21 1989-09-04 Dowty Seals Ltd シール組立体
JPH0253569U (fr) * 1988-06-29 1990-04-18
JP2008080991A (ja) * 2006-09-28 2008-04-10 Toyoda Gosei Co Ltd コラムホールカバー

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011101968B4 (de) 2010-05-19 2022-07-14 Smc Kabushiki Kaisha Fluiddruckvorrichtung

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