EP3221596A1 - Cylindre pneumatique comprenant un manchon amortisseur - Google Patents

Cylindre pneumatique comprenant un manchon amortisseur

Info

Publication number: EP3221596A1
Authority: EP; European Patent Office
Prior art keywords: pneumatic cylinder; piston; sleeve; holes; damper
Prior art date: 2014-11-18
Legal status (The legal status 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 status listed.): Granted

Application number

EP15818039.8A

Other languages

German (de)

English (en)

Other versions

EP3221596B1 (fr

Inventor

Sebastian BICELLI

Dario Braga

Fabio BOTTARELLI

Vladimir Morozov

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Camozzi Automation SpA

Original Assignee

Camozzi SpA

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.)

2014-11-18

Filing date

2015-11-16

Publication date

2017-09-27

2015-11-16 Application filed by Camozzi SpA filed Critical Camozzi SpA

2017-09-27 Publication of EP3221596A1 publication Critical patent/EP3221596A1/fr

2020-08-19 Application granted granted Critical

2020-08-19 Publication of EP3221596B1 publication Critical patent/EP3221596B1/fr

Status Active legal-status Critical Current

2035-11-16 Anticipated expiration legal-status Critical

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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
- F15B15/222—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which throttles the main fluid outlet as the piston approaches its end position

Definitions

This invention relates to a pneumatic cylinder provided with means of self-damping the piston.
a pneumatic cylinder provided with a piston movable with reciprocating motion inside a casing, is generally provided with a damping means to ensure a reduction in the intensity of the impact that occurs when the piston arrives in frontal support in a suitable seat formed in the head of the casing.
the known damping means include damper sleeves, made of resilient material, applied to the piston head.
damper sleeves are described in patent EP2047116, wherein on the head of the piston rod is provided at least one sleeve provided, on the outer surface, with damping grooves extending in the longitudinal direction.
the air compressed between the piston and a sealing element housed in the cavity of the head reduces the intensity of the impact of the piston and, through the damping grooves, exits towards suitable openings made in the head of the casing.
the geometry of the grooves determines a discharge law of the air that allows the controlled slowing of the piston.
a groove for example V-shaped, involves a reduction of the section in the axial direction and represents a point of weakening of the structure of the sleeve;
high pressure can cause deformation of the sealing element (housed in the head cavity of the casing) , which can, at least partially, close the grooves and change the discharge law of the air that allows the controlled slowing of the piston.
Figure 1 shows a pneumatic cylinder provided with a damper sleeve according to this invention, in a first end-stroke position
Figures 2 to 6 show the piston head provided with a pair of damper sleeves according to this invention, in advancement up to the end-stroke position;
Figure 7 shows a pneumatic cylinder' provided with a damper sleeve according to this invention, in a second end-stroke position;
Figure 8 shows a perspective view of half-piston and damper sleeve according to this invention, in an embodiment variant
Figures 9 and 10 show respectively a sectional view and a top view of the half-piston and damper sleeve of Figure 8;
Figure 11 shows a perspective view of the half- piston and damper sleeve according to this invention, in a further embodiment variant
Figures 12 and 13 show respectively a sectional view and a top view of the half-piston and damper sleeve of Figure 11.
Figure 14 shows a pneumatic cylinder provided with a damper sleeve according to this invention, in a further embodiment variant .
reference number 100 indicates a pneumatic cylinder provided with at least once damper sleeve 10.
Figure 1 shows a linear double-acting pneumatic cylinder.
the pneumatic cylinder 100 comprising a casing or jacket 103, cylindrical, inside which is housed a piston 20, axially mobile along the axis X.
the piston 20 is fixed to a stem 21.
the piston 20 comprises a first portion or front half-piston 20' and a second portion or rear half-piston 20' ' .
the operating principle consists in introducing pressurised air into one of the two chambers 102,102' defined inside the casing 103, so that the air pushes on one face of the piston 20 and makes it move inside the casing 103.
the casing 103 defines a front head 104 and a rear head 105, each provided with an abutment wall 106,107 for abutment with the piston head 20 in an end-stroke position and, in particular, respectively with the front half-piston 20' rear half-piston 20''.
Both the front head 104 and the rear head 105 are provided with a chamber 112,113 for housing the sleeve connected to the piston 20, respectively to the front half-piston 20' and to the rear half-piston 20' ' .
Both the front head 104 that the rear head 105 are provided with a duct 108,109 for connection with specific pneumatic lines (not shown) for feeding the fluid (air or gas) to the inside of the casing 103.
the duct 108,109 is in fluid communication with the respective front chamber 102' or rear chamber 102 through the chamber 112,113 for the housing the sleeve connected to the piston 20.
the pneumatic piston 100 comprises several gaskets that prevent the leakage of air from one chamber to the other as well as to the outside.
Both the front head 104 that the rear head 105 are therefore provided with at least one annular outer gasket 110,111, housed in a suitable cavity formed in a wall of the respective seat 106,107.
the piston 20 is provided with at least one annular inner gasket 26, housed in a suitable cavity formed on the body of the piston.
the piston 20 is provided with a front inner gasket and a rear inner gasket .
damper means 10 are provided.
the sleeve 10 is in one piece with the piston 20 and, in particular, a first sleeve 10 is in one piece with the front half-piston 20' and a second sleeve 10 is in one piece with the rear half-piston 20' ' .
the piston 20 and the sleeve 10 are separate elements.
the sleeve 10 is fixable to the piston 20 and, in particular, a first sleeve 10 is fixable to the front half-piston 20' and a second sleeve 10 is fixable to the rear half-piston 20 ' 1 .
the damper sleeve 10 allows reducing the intensity of the impact that occurs when the piston 20 arrives in abutment against the cylinder head 104,105.
the pneumatic cylinder 100 is provided with a pair of damper sleeves 10 provided on both sides of the piston 20.
the presence of a pair of sleeves 10 allows damping the piston 20 in both the outbound position, in the chamber 102', and return position, in the chamber 102.
the half-piston 20 ',20 1 1 is provided with an annular seat 11, for housing an inner gasket 26.
the sleeve 10 comprises a main body 12, extended in the axial direction, and provided with a through opening 13.
the main body 12 comprises a front portion 14, substantially cylindrical, suitable to be housed in the chamber 112,113 of the head 104,105.
the main body 12 comprises a further rear portion 15, which protrudes radially with respect to the front portion 14.
the further rear portion 15 defines the half-piston 20',20''.
the further rear portion 15 that defines the half-piston is provided with a seat 11 for ' housing an inner gasket 26.
the further rear portion 15 is substantially a flange or edge.
the front portion 14 is provided with a wall 143 defined, in the radial direction, by an inner face 141 and an outer face 142.
the outer face 142 is substantially parallel to the axis X and the inner face 141 is inclined by an angle ?.
the wall 143 of the front portion 14 is tapered, with a wall thickness that decreases towards a front end 144 of the damper sleeve 10.
the front portion 14 defines a frusto-conical front opening with a greater conicity towards the front end 144 of the damper sleeve 10.
the sleeve 10 is provided with a plurality of through holes 60 that extend in the radial direction, provided in correspondence of the front portion 14.
the holes 60 are arranged in line in the axial direction X.
the holes 60 are distributed circumferentially on the front portion 14.
the longitudinal distance D (in the direction X) between two consecutive holes is variable.
the distance D increases towards a front end 144 of the damper sleeve 10, as shown in the variants of Figure 8 and 11.
the holes 60 are equal, and have the same diameter.
the holes 60 are ' equal, have the same diameter, and are positioned at a variable distance D.
the distance D increases towards a front end 144 of the damper sleeve 10.
the holes have a different diameter and are positioned at an equal distance D.
the distance D between the holes remains unchanged from the interior towards a front end 144 of the damper sleeve 10.
the holes have a different diameter and are positioned at a variable distance D.
the tapered wall 143 of the front portion 14 of the sleeve 10 allows defining a vent space 80 for the pressurised air, defined between the stem 21 and the inner wall 141 of the sleeve 10.
the holes 60 provide passage for venting the pressurised air.
the front portion 14 of the sleeve extends axially beyond the head of the stem 21.
this configuration allows defining a particularly ample vent space 80 for the pressurised air.
the size of the holes 60, the number of holes 60, the distance D between the holes 60, the angle ? and the thickness of the tapered wall 143 of the front portion 14 influence the damping behaviour of the compressed gas and thus define the discharge law of the air that allows the controlled slowing of the piston.
the tapered wall 143 with a wall thickness that decreases towards a front end 144 of the damper sleeve 10, favours the passage of air through the holes 60.
a damper sleeve 100 provided with a tapered wall 143 allows obtaining a free passage for the air (vent space 80) without throttling the flow.
a damper sleeve 100 provided with a tapered wall 143 always allows obtaining a free ⁇ passage for the air (vent space 80) even in case of deformations of the outer gasket 110,111.
a damper sleeve 100 provided with tapered wall 143 and holes 60 allows the air to flow out smoothly, from the narrower conical part to the wider part, with no load losses.
a damper sleeve 10 provided with tapered wall 143 and of holes 60 facilitates the expulsion of air without compromising the ogival section.
a pneumatic cylinder provided with a damper sleeve according to this invention is able to function properly in a wide range of speeds, pressures and loads .

Landscapes

Engineering & Computer Science (AREA)
Physics & Mathematics (AREA)
Fluid Mechanics (AREA)
Mechanical Engineering (AREA)
General Engineering & Computer Science (AREA)
Actuator (AREA)
Fluid-Damping Devices (AREA)

EP15818039.8A 2014-11-18 2015-11-16 Manchon amortisseur et cylindre pneumatique Active EP3221596B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
ITBS20140192		2014-11-18
PCT/IB2015/058846 WO2016079653A1 (fr)	2014-11-18	2015-11-16	Cylindre pneumatique comprenant un manchon amortisseur

Publications (2)

Publication Number	Publication Date
EP3221596A1 true EP3221596A1 (fr)	2017-09-27
EP3221596B1 EP3221596B1 (fr)	2020-08-19

Family

ID=52350205

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP15818039.8A Active EP3221596B1 (fr)	2014-11-18	2015-11-16	Manchon amortisseur et cylindre pneumatique

Country Status (3)

Country	Link
EP (1)	EP3221596B1 (fr)
CN (1)	CN107250569B (fr)
WO (1)	WO2016079653A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
IT201900001511A1 (it) *	2019-02-01	2020-08-01	Cnh Ind Italia Spa	Cilindro idraulico migliorato per veicolo da lavoro
US11111936B2 (en)	2019-08-20	2021-09-07	Roller Bearing Company Of America, Inc.	Piston assembly having reduced extend force and reduced displacement volume
CN110486526B (zh) *	2019-09-23	2024-03-08	湖南力威液压设备股份有限公司	一种节能型自由侧翻式拍门缓冲器
GB2594521B (en)	2020-05-01	2024-07-10	Caterpillar Sarl	Articulated truck steering
CN112178323B (zh) *	2020-09-21	2022-05-06	中国航发沈阳发动机研究所	一种自锁式空气导管

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Publication number	Priority date	Publication date	Assignee	Title
DE2805774A1 (de) *	1978-02-10	1979-08-16	Knorr Bremse Gmbh	Daempfungssteuerungseinrichtung fuer den kolben eines arbeitszylinders
JPS6054522B2 (ja) *	1979-11-19	1985-11-30	東京タイヨ−株式会社	ショックアブソ−バ付空気圧シリンダ装置
JPH10169614A (ja) *	1996-12-09	1998-06-23	Kayaba Ind Co Ltd	流体圧シリンダのクッション装置
EP1283958B1 (fr) *	2000-05-24	2006-08-02	Johann Weiss Maschinenbau	Verin pneumatique a amortissement de fin de course
WO2002042649A1 (fr) *	2000-11-23	2002-05-30	Choi Hag Bong	Cylindre hydraulique de type amortisseur progressif
EP2047116B1 (fr)	2007-01-12	2010-07-14	Festo AG & Co. KG	Unite lineaire actionnee par fluide, notamment entrainement lineaire
DE102010006117B3 (de) *	2010-01-29	2011-06-16	Stabilus Gmbh	Kolben-Zylinderaggregat
CN201671909U (zh) *	2010-06-13	2010-12-15	金湘江	渐闭螺旋缓冲套式液压缸

2015
- 2015-11-16 EP EP15818039.8A patent/EP3221596B1/fr active Active
- 2015-11-16 CN CN201580062601.8A patent/CN107250569B/zh active Active
- 2015-11-16 WO PCT/IB2015/058846 patent/WO2016079653A1/fr not_active Ceased

Also Published As

Publication number	Publication date
EP3221596B1 (fr)	2020-08-19
CN107250569B (zh)	2019-12-10
WO2016079653A1 (fr)	2016-05-26
CN107250569A (zh)	2017-10-13

Publication	Publication Date	Title
EP3221596B1 (fr)	2020-08-19	Manchon amortisseur et cylindre pneumatique
US11391337B2 (en)	2022-07-19	Adjustable vibration damper and vehicle having such a vibration damper
US7900549B2 (en)	2011-03-08	Cushion ring and fluid-pressure cylinder
FI93261B (fi)	1994-11-30	Mäntätiivistys- ja vaimennuslaite
CN103291801B (zh)	2016-08-24	气弹簧和气弹簧部件
US10352337B2 (en)	2019-07-16	Fluid pressure cylinder
CN101191509A (zh)	2008-06-04	流体压力缸
CN101365886B (zh)	2012-04-25	流体操控的线性单元、尤其是线性驱动装置
RU175843U9 (ru)	2018-03-23	Гидро (пневмо) цилиндр
US9739276B2 (en)	2017-08-22	Piston/cylinder unit
US10202988B2 (en)	2019-02-12	Cushion mechanism for a hydraulic cylinder
US20150276002A1 (en)	2015-10-01	Damping Valve Arrangement With A Multistage Damping Force Characteristic
CN103765018B (zh)	2015-11-25	流体压缸
ITMI952169A1 (it)	1997-04-20	Ammortizzatore telescopico di vibrazioni
US20030140781A1 (en)	2003-07-31	Pneumatic cylinder with damping in the end position
KR20190132235A (ko)	2019-11-27	유압식 단부 정지부를 포함한 진동 댐퍼
US20020078823A1 (en)	2002-06-27	Guide for the piston rod of a piston-cylinder assembly
JP2015200379A (ja)	2015-11-12	油圧シリンダのクッション装置
US9109704B2 (en)	2015-08-18	Compressed-air control device with molded seal
KR20100080828A (ko)	2010-07-12	제어된 정지 위치를 구비한 유공압 실린더
CN115585209A (zh)	2023-01-10	具有可调节的阻尼阀装置的振动阻尼器
EP3295036B1 (fr)	2020-10-07	Vérin comportant un bypass du piston dans une position donnée du piston
WO2020096544A3 (fr)	2020-07-16	Configuration de vérin à gaz à décharge via la tige du vérin à gaz
US12297849B2 (en)	2025-05-13	Cylinder degassing unit and working cylinder
WO2024085063A1 (fr)	2024-04-25	Cylindre à pression de fluide

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