EP3221596A1 - Pneumatic cylinder with damper sleeve - Google Patents
Pneumatic cylinder with damper sleeveInfo
- Publication number
- EP3221596A1 EP3221596A1 EP15818039.8A EP15818039A EP3221596A1 EP 3221596 A1 EP3221596 A1 EP 3221596A1 EP 15818039 A EP15818039 A EP 15818039A EP 3221596 A1 EP3221596 A1 EP 3221596A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- pneumatic cylinder
- sleeve
- holes
- damper
- Prior art date
- 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
Links
- 238000013459 approach Methods 0.000 claims abstract description 5
- 230000007423 decrease Effects 0.000 claims abstract description 5
- 238000013016 damping Methods 0.000 description 11
- 239000012530 fluid Substances 0.000 description 4
- 230000001010 compromised effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBS20140192 | 2014-11-18 | ||
PCT/IB2015/058846 WO2016079653A1 (en) | 2014-11-18 | 2015-11-16 | Pneumatic cylinder with damper sleeve |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3221596A1 true EP3221596A1 (en) | 2017-09-27 |
EP3221596B1 EP3221596B1 (en) | 2020-08-19 |
Family
ID=52350205
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15818039.8A Active EP3221596B1 (en) | 2014-11-18 | 2015-11-16 | Damper sleeve and pneumatic cylinder |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3221596B1 (en) |
CN (1) | CN107250569B (en) |
WO (1) | WO2016079653A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT201900001511A1 (en) * | 2019-02-01 | 2020-08-01 | Cnh Ind Italia Spa | IMPROVED HYDRAULIC CYLINDER FOR WORK VEHICLE |
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 (en) * | 2019-09-23 | 2024-03-08 | 湖南力威液压设备股份有限公司 | Energy-saving free side-turning flap valve buffer |
CN112178323B (en) * | 2020-09-21 | 2022-05-06 | 中国航发沈阳发动机研究所 | Self-locking air conduit |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2805774A1 (en) * | 1978-02-10 | 1979-08-16 | Knorr Bremse Gmbh | Damping control system for pneumatic door actuator - has cylinder defining annular gap for air supply connection |
JPS6054522B2 (en) * | 1979-11-19 | 1985-11-30 | 東京タイヨ−株式会社 | Pneumatic cylinder device with shock absorber |
JPH10169614A (en) * | 1996-12-09 | 1998-06-23 | Kayaba Ind Co Ltd | Cushion device for fluid pressure cylinder |
WO2001090585A1 (en) * | 2000-05-24 | 2001-11-29 | Johann Weiss Maschinenbau | Pneumatic cylinder with damping in the end position |
AU2002223150A1 (en) * | 2000-11-23 | 2002-06-03 | Hag-Bong Choi | Stepless cushion type hydraulic cylinder |
DE502007004411D1 (en) | 2007-01-12 | 2010-08-26 | Festo Ag & Co Kg | FLUID-OPERATED LINEAR UNIT, PARTICULARLY LINEAR ACTUATOR |
DE102010006117B3 (en) * | 2010-01-29 | 2011-06-16 | Stabilus Gmbh | Piston-cylinder assembly |
CN201671909U (en) * | 2010-06-13 | 2010-12-15 | 金湘江 | Gradually-close spiral cushion collar-type hydraulic cylinder |
-
2015
- 2015-11-16 WO PCT/IB2015/058846 patent/WO2016079653A1/en active Application Filing
- 2015-11-16 CN CN201580062601.8A patent/CN107250569B/en active Active
- 2015-11-16 EP EP15818039.8A patent/EP3221596B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2016079653A1 (en) | 2016-05-26 |
CN107250569B (en) | 2019-12-10 |
EP3221596B1 (en) | 2020-08-19 |
CN107250569A (en) | 2017-10-13 |
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