WO2022172846A1 - Vérin hydraulique - Google Patents

Vérin hydraulique Download PDF

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Publication number
WO2022172846A1
WO2022172846A1 PCT/JP2022/004181 JP2022004181W WO2022172846A1 WO 2022172846 A1 WO2022172846 A1 WO 2022172846A1 JP 2022004181 W JP2022004181 W JP 2022004181W WO 2022172846 A1 WO2022172846 A1 WO 2022172846A1
Authority
WO
WIPO (PCT)
Prior art keywords
bearing
piston rod
retaining wall
insertion hole
piston
Prior art date
Application number
PCT/JP2022/004181
Other languages
English (en)
Japanese (ja)
Inventor
佑介 高橋
俊雄 小林
Original Assignee
Ｋｙｂ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 Ｋｙｂ株式会社 filed Critical Ｋｙｂ株式会社
Priority to CN202280013966.1A priority Critical patent/CN116848329A/zh
Priority to KR1020237026392A priority patent/KR20230137924A/ko
Publication of WO2022172846A1 publication Critical patent/WO2022172846A1/fr

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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
    • 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

Definitions

  • the present invention relates to fluid pressure cylinders.
  • JP 2013-199950A discloses a fluid pressure cylinder in which a piston rod to which a piston is fastened is reciprocally provided in a cylinder tube, the cylinder head closing an end opening of the cylinder tube.
  • a fluid pressure cylinder is disclosed in which a bearing is interposed by a snap ring on the inner peripheral surface.
  • the present invention has been made in view of the above problems, and an object of the present invention is to prevent a bearing from coming off with a simple structure.
  • the present invention is a fluid pressure cylinder in which a piston rod provided with a piston is reciprocably provided in a cylinder tube, wherein an end opening of the cylinder tube is closed and an insertion hole through which the piston rod is inserted is formed.
  • a bearing provided in the closing member for slidably supporting the piston rod; and a pressure chamber partitioned between the closing member and the piston, the closing member extending into the insertion hole. It has a bearing housing groove formed on the peripheral surface and housing the bearing.
  • the bearing housing groove has a groove bottom with which the outer peripheral surface of the bearing abuts, and a retaining wall that prevents the bearing from coming off toward the pressure chamber.
  • the retaining wall is characterized in that its height is greater than the clearance between the bearing and the piston rod.
  • FIG. 1 is a cross-sectional view of a fluid pressure cylinder according to an embodiment of the present invention
  • FIG. FIG. 2 is an enlarged view of a portion A surrounded by a dashed line in FIG. 1;
  • FIG. 1 is a sectional view around a cylinder head 40 of a hydraulic cylinder 100.
  • the hydraulic cylinder 100 is used as an actuator mounted on construction machinery and industrial machinery.
  • the hydraulic cylinder 100 is used as an arm cylinder mounted on a hydraulic excavator, and the arm of the hydraulic excavator rotates as the hydraulic cylinder 100 expands and contracts.
  • the hydraulic cylinder 100 includes a cylindrical cylinder tube 10, and a rod-side chamber 11 and an anti-rod-side chamber 12 which are slidably inserted into the cylinder tube 10 and which serve as pressure chambers.
  • the inside of the cylinder tube 10 is partitioned by the piston 20 into two fluid pressure chambers, a rod-side chamber 11 as a pressure chamber and a non-rod-side chamber 12 .
  • the hydraulic cylinder 100 is expanded and contracted along the axial direction by hydraulic pressure led from the hydraulic source to the rod-side chamber 11 or the anti-rod-side chamber 12 .
  • a working fluid such as a water-soluble substitute fluid may be used instead of oil as the hydraulic fluid.
  • the cylinder head 40 is a substantially cylindrical member having an insertion hole 41 through which the piston rod 30 is inserted. Cylinder head 40 is coupled to flange portion 10 a formed at the end of cylinder tube 10 via bolt 39 .
  • a bearing 55 , a sub-seal 56 , a main seal 57 and a dust seal 58 are arranged outward in this order on the inner peripheral surface of the insertion hole 41 . These are in sliding contact with the outer peripheral surface of the piston rod 30 , and particularly the bearing 55 supports the piston rod 30 so as to be slidable in the axial direction of the cylinder tube 10 .
  • the bearing 55 is a cylindrical bearing made of a mixed material in which resin is dispersed in a metal such as an alloy, it has a certain degree of flexibility.
  • the cylinder head 40 is provided with a supply/discharge port 42 for supplying/discharging hydraulic oil to/from the rod-side chamber 11 .
  • a supply/discharge port 42 opens to the inner peripheral surface of the insertion hole 41 , and the other end of the supply/discharge port 42 opens to the outer surface of the cylinder head 40 .
  • a hydraulic pipe (not shown) is connected to the other end of the supply/discharge port 42, and the hydraulic pipe is connected to a hydraulic source or a tank through a switching valve.
  • the cylinder head 40 is provided with a cylindrical portion 45 that fits into the inner peripheral surface of the flange portion 10 a of the cylinder tube 10 .
  • An O-ring 59 for sealing between the cylinder tube 10 and the cylinder head 40 is provided on the outer peripheral surface of the cylindrical portion 45 .
  • the tip surface of the cylindrical portion 45 functions as a restricting surface that the piston 20 comes into contact with when the hydraulic cylinder 100 is most extended and restricts movement of the piston 20 and the piston rod 30 .
  • the insertion hole 41 has a first insertion hole 41a into which a cushion ring 34, which will be described later, can enter, and a second insertion hole 41b having an inner diameter smaller than that of the first insertion hole 41a.
  • the first insertion hole 41a is provided on the cylindrical portion 45 side, and the second insertion hole 41b is provided on the opposite side of the supply/discharge port 42 from the first insertion hole 41a.
  • the piston rod 30 includes a small-diameter portion 31 formed at the tip portion to which the piston 20 is fastened, a large-diameter portion 32 having an outer diameter larger than that of the small-diameter portion 31 and slidably supported by the cylinder head 40, and a small-diameter portion 31 and a large-diameter portion 32 . and a medium-diameter portion 33 formed between the diameter portions 32 and having a cushion ring 34 arranged radially outward. Since the outer diameter of the medium-diameter portion 33 and the inner diameter of the cushion ring 34 are set smaller than the outer diameters of the large-diameter portion 32 and the piston 20 , the cushion ring 34 does not slip out of the piston rod 30 .
  • the cushion ring 34 is a cylindrical member having an outer diameter that can be inserted into the first insertion hole 41a of the cylinder head 40, and serves to reduce the moving speed of the piston rod 30 when the hydraulic cylinder 100 reaches the most extended state.
  • the hydraulic oil in the rod-side chamber 11 flows between the outer peripheral surface of the large-diameter portion 32 and the inner peripheral surface of the first insertion hole 41a. It is led to the supply/discharge port 42 through a passage having a relatively large cross-sectional area formed therebetween. Therefore, the piston rod 30 can move at a relatively high speed.
  • the cushion ring 34 enters the first insertion hole 41a, the cross-sectional area of the passage connecting the supply/discharge port 42 and the rod-side chamber 11 gradually decreases, so the moving speed of the piston rod 30 further decreases. In this manner, the cushion ring 34 exerts a cushioning action, and the piston 20 is prevented from colliding with the cylinder head 40 with force.
  • a bearing housing groove 51, a sub-seal housing groove 52, a main seal housing groove 53, and a dust seal housing groove 54 are arranged outward in this order on the inner peripheral surface of the second insertion hole 41b. formed by The bearing 55, the sub-seal 56, the main seal 57 and the dust seal 58 are housed (mounted) in the bearing housing groove 51, the sub-seal housing groove 52, the main seal housing groove 53 and the dust seal housing groove 54, respectively. The sub-seal 56 , main seal 57 and dust seal 58 are in sliding contact with the outer peripheral surface of the piston rod 30 .
  • the bearing receiving groove 51 includes a groove bottom portion 511 extending along the axial direction and a retainer portion provided on one side of the groove bottom portion 511 in the axial direction to partition the bearing receiving groove 51 . It has a wall 512 and a regulation wall 513 provided on the other side in the axial direction of the groove bottom 511 and partitioning the bearing housing groove 51 .
  • the groove bottom 511 is formed so that its diameter is approximately equal to the outer diameter of the bearing 55 .
  • the outer peripheral surface of the bearing 55 contacts the groove bottom 511 .
  • the groove bottom portion 511 is formed so that its diameter is smaller than the inner diameter of the first insertion hole 41a. That is, the first insertion hole 41 a is formed so that its inner diameter is larger than the outer diameter of the bearing 55 . Accordingly, the bearing 55 can smoothly pass through the first insertion hole 41a and enter the second insertion hole 41b without being press-fitted.
  • the retaining wall 512 is an annular wall for preventing the bearing 55 from coming off toward the rod-side chamber 11 side.
  • the retaining wall 512 is formed to protrude from the groove bottom 511 toward the axis O along the radial direction.
  • the retaining wall 512 When the large-diameter portion 32 of the piston rod 30 is inserted through the cylinder head 40 , the retaining wall 512 has a height h1 of the bearing 55 accommodated in the bearing accommodation groove 51 and the large-diameter portion 32 of the piston rod 30 . is larger than the clearance c1 between and (see FIG. 2). Specifically, the clearance c ⁇ b>1 is the radial dimension between the inner peripheral surface of the bearing 55 and the outer peripheral surface of the large diameter portion 32 .
  • the retaining wall 512 is such that the clearance c3 between the vertex 512 c and the large-diameter portion 32 of the piston rod 30 is the thickness of the bearing 55 .
  • d ie, the dimension between the inner peripheral surface of bearing 55 and the outer peripheral surface of bearing 55
  • the bearing 55 does not pass through the clearance c3 between the apex 512c of the retaining wall 512 and the large-diameter portion 32 of the piston rod 30, so that the bearing 55 climbs over the retaining wall 512 and moves into the bearing receiving groove 51. I can't get out of
  • the retaining wall 512 has a height h ⁇ b>1 (that is, the amount of protrusion of the retaining wall 512 from the groove bottom 511 ) smaller than the thickness d of the bearing 55 .
  • the height of the retaining wall 512 can be reduced, so that the amount of deformation of the bearing 55 during press-fitting can be reduced.
  • the retaining wall 512 has a first tapered portion 512 a that guides the bearing 55 to the groove bottom portion 511 and a second tapered portion 512 b that faces the end surface 55 a of the bearing 55 .
  • the first tapered portion 512a is directly continuous with the second tapered portion 512b in the axial direction, but is not limited to this. It may be connected indirectly to the second tapered portion 512b through the flat portion.
  • the first tapered portion 512a is formed such that the clearance between it and the large diameter portion 32 of the piston rod 30 gradually decreases toward the outside (the side opposite to the piston). As a result, the bearing 55 is smoothly press-fitted into the bearing housing groove 51 while being guided by the first tapered portion 512a.
  • the inclination angle ⁇ of the first tapered portion 512a is preferably 60° or less, more preferably 45° or less, and 30° or less. is more preferred.
  • the inclination angle ⁇ of the first tapered portion 512a is 20°.
  • the inner diameter of the end portion 512 d of the first tapered portion 512 a is larger than the inner diameter of the groove bottom portion 511 . This makes it easier to insert the bearing 55 into the bearing receiving groove 51 .
  • the second tapered portion 512b is formed so that the clearance between it and the large diameter portion 32 of the piston rod 30 gradually increases toward the outside. As a result, machining of the cylinder head 40 is facilitated compared to the bearing housing groove 51 in which the second tapered portion 512b is not formed. From the viewpoint of making it difficult for the bearing 55 to come off, it is preferable to make the inclination angle ⁇ of the second tapered portion 512b larger than the inclination angle ⁇ of the first tapered portion 512a. In addition, in this embodiment, the inclination angle ⁇ of the second tapered portion 512b is 30°.
  • the restricting wall 513 is an annular wall that faces the retaining wall 512 and restricts axial movement of the bearing 55 .
  • the restricting wall 513 is formed to protrude from the groove bottom 511 toward the axis O along the radial direction.
  • the restricting wall 513 has a height h2 (that is, the amount of protrusion of the restricting wall 513 from the groove bottom 511) that is greater than the height h1 of the retaining wall 512 (see FIG. 2).
  • the height of the retaining wall 512 can be reduced, so that the amount of deformation of the bearing 55 during press-fitting can be reduced.
  • the regulation wall 513 does not contact the large diameter portion 32 of the piston rod 30 .
  • the clearance c2 between the regulation wall 513 and the large diameter portion 32 of the piston rod 30 is equal to the clearance c1 between the bearing 55 and the large diameter portion 32 of the piston rod 30 (see FIG. 2).
  • a hydraulic cylinder 100 is a hydraulic cylinder 100 in which a piston rod 30 provided with a piston 20 is reciprocally provided in a cylinder tube 10, and closes an end opening of the cylinder tube 10. , a cylinder head 40 having an insertion hole 41 through which the piston rod 30 is inserted; a bearing 55 provided in the cylinder head 40 for slidably supporting the piston rod 30; and a partitioned rod-side chamber 11 .
  • the cylinder head 40 has a bearing housing groove 51 formed in the inner peripheral surface of the insertion hole 41 and housing a bearing 55 .
  • the bearing housing groove 51 has a groove bottom 511 with which the outer peripheral surface of the bearing 55 abuts, and a retaining wall 512 that restricts the bearing 55 from coming off toward the rod-side chamber 11.
  • the retaining wall 512 has a height of greater than the clearance between bearing 55 and piston rod 30.
  • the bearing receiving groove 51 is formed on the inner peripheral surface of the insertion hole 41 of the cylinder head 40 , the bearing 55 can be displaced when the piston rod 30 is not inserted through the insertion hole 41 of the cylinder head 40 . are housed in the bearing housing groove 51 by press fitting. Further, since the height h1 of the retaining wall 512 that restricts the bearing 55 from coming off toward the rod-side chamber 11 is greater than the clearance c1 between the bearing 55 and the piston rod 30, the piston is inserted into the insertion hole 41 of the cylinder head 40. In the state in which the rod 30 is inserted, the bearing 55 does not get over the retaining wall 512 and come out of the bearing receiving groove 51 . Therefore, it is possible to prevent the bearing 55 from coming off with a simple structure without using a snap ring.
  • the bearing 55 is press-fitted into the bearing receiving groove 51 via the retaining wall 512 , and the retaining wall 512 has a first tapered portion 512 a that guides the bearing 55 to the groove bottom 511 . It is formed.
  • the bearing 55 is smoothly press-fitted into the bearing housing groove 51 while being guided by the first tapered portion 512a, so the mountability of the bearing 55 is improved.
  • the retaining wall 512 is formed with a second tapered portion 512b facing the end surface of the bearing 55, and the inclination angle ⁇ of the second tapered portion 512b is larger than the inclination angle ⁇ of the first tapered portion 512a. big.
  • the workability of the cylinder head 40 is improved compared to the bearing housing groove 51 in which the second tapered portion 512b is not formed. Further, by making the inclination angle ⁇ of the second tapered portion 512b larger than the inclination angle ⁇ of the first tapered portion 512a, the bearing 55 is less likely to come off.
  • the bearing receiving groove 51 further has a restricting wall 513 that faces the retaining wall 512 and restricts axial movement of the bearing 55.
  • the restricting wall 513 has a height h2 of the retaining wall. 512 is greater than the height h1. According to this, the height of the retaining wall 512 can be reduced, so that the amount of deformation of the bearing 55 at the time of press-fitting can be reduced.
  • the retaining wall 512 is formed along the entire circumference of the ring, but is not limited to this. A plurality of spaces may be formed.
  • the retaining wall 512 has the first tapered portion 512a and the second tapered portion 512b that is continuous with the first tapered portion 512a. Only the first tapered portion 512a may be formed without forming the portion 512b. In this case, the space for forming the second tapered portion 512b can be saved compared to the retaining wall 512 in which the first tapered portion 512a and the second tapered portion 512b are formed. Miniaturization can be achieved.
  • the regulation wall 513 is provided so that the clearance c2 between the piston rod 30 and the large diameter portion 32 is equal to the clearance c1 between the bearing 55 and the piston rod 30 large diameter portion 32.
  • the clearance c2 between the large diameter portion 32 of the piston rod 30 is larger than the clearance c1 between the bearing 55 and the large diameter portion 32 of the piston rod 30. It may be provided to be large. In this case, contact between the regulation wall 513 and the large diameter portion 32 of the piston rod 30 can be prevented.

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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

La présente invention concerne un vérin hydraulique (100) comprenant : une culasse (40) qui ferme une partie d'ouverture de partie extrémité d'un tube de cylindre (10) et dans laquelle est formé un trou d'insertion (41) à travers lequel une tige de piston (30) est insérée ; un palier (55) qui est disposé sur la culasse (40) et supporte de manière coulissante la tige de piston (30) ; et une chambre côté tige (11) qui est formée entre la culasse (40) et un piston (20). La culasse (40) présente une rainure de réception de palier (51) qui est formée dans la surface circonférentielle interne du trou d'insertion (41) et reçoit le palier (55). La rainure de réception de palier (51) comprend : une partie inférieure de rainure (511) qui est en butée par la surface circonférentielle externe du palier (55) ; et une paroi de retenue (512) qui empêche le palier (55) de glisser sur le côté de la chambre côté tige (11). La hauteur (h1) de la paroi de retenue (512) est supérieure à l'espacement (c1) entre le palier (55) et la tige de piston (30).
PCT/JP2022/004181 2021-02-10 2022-02-03 Vérin hydraulique WO2022172846A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202280013966.1A CN116848329A (zh) 2021-02-10 2022-02-03 流体压力缸
KR1020237026392A KR20230137924A (ko) 2021-02-10 2022-02-03 유체압 실린더

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-020096 2021-02-10
JP2021020096A JP2022122695A (ja) 2021-02-10 2021-02-10 流体圧シリンダ

Publications (1)

Publication Number Publication Date
WO2022172846A1 true WO2022172846A1 (fr) 2022-08-18

Family

ID=82837815

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/004181 WO2022172846A1 (fr) 2021-02-10 2022-02-03 Vérin hydraulique

Country Status (4)

Country Link
JP (1) JP2022122695A (fr)
KR (1) KR20230137924A (fr)
CN (1) CN116848329A (fr)
WO (1) WO2022172846A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013199950A (ja) * 2012-03-23 2013-10-03 Kyb Co Ltd 流体圧シリンダ
JP2019158068A (ja) * 2018-03-15 2019-09-19 Ｋｙｂ株式会社 ショックアブソーバ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013199950A (ja) * 2012-03-23 2013-10-03 Kyb Co Ltd 流体圧シリンダ
JP2019158068A (ja) * 2018-03-15 2019-09-19 Ｋｙｂ株式会社 ショックアブソーバ

Also Published As

Publication number Publication date
CN116848329A (zh) 2023-10-03
KR20230137924A (ko) 2023-10-05
JP2022122695A (ja) 2022-08-23

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