EP0896159A2 - Cylindre pneumatique à tige de piston non rotative - Google Patents
Cylindre pneumatique à tige de piston non rotative Download PDFInfo
- Publication number
- EP0896159A2 EP0896159A2 EP98200300A EP98200300A EP0896159A2 EP 0896159 A2 EP0896159 A2 EP 0896159A2 EP 98200300 A EP98200300 A EP 98200300A EP 98200300 A EP98200300 A EP 98200300A EP 0896159 A2 EP0896159 A2 EP 0896159A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- pneumatic cylinder
- shaft
- rotating
- rolling elements
- sleeve member
- 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.)
- Withdrawn
Links
Images
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
- F15B15/1414—Characterised by the construction of the motor unit of the straight-cylinder type with non-rotatable piston
Definitions
- the present invention relates to the field of pneumatic equipment and more particularly a pneumatic cylinder of the kind having a non rotating shaft.
- Pneumatic cylinders with non rotating shaft of state of the art are generally provided with shaped bushings, for instance of triangular or quadrangular cross-section or with lobes and a shaft that has a cross-sectional shape corresponding to that of the bushing.
- Object of the present invention is to remove the above mentioned drawbacks and to provide a pneumatic cylinder with non rotating shaft, having great precision and performances that are considerably higher than those of the known pneumatic cylinders.
- the pneumatic cylinder according to the present invention substantially employs a splined shaft and a sleeve, friction between these two members being rolling friction, thus considerably lower than the sliding friction of the known devices.
- the pneumatic cylinder 10 comprises, in addition to the liner or tube (not shown for sake of clarity): a stem 12, a front head 14, a front dampening ogive 16, a piston 18, a threaded portion 20 of the shaft 48, a back ogive 22, having not only the dampening function but also that of containing a sleeve 24 (which will be described in detail hereinafter), a back head 26, a splined bar 28, an end plate 30 provided with a threaded portion 32 for matching a corresponding threaded portion 34 of the back head 26 and one or more pins 36 for locking the end plate to the back head.
- a stem 12 a front head 14
- a front dampening ogive 16 a piston 18, a threaded portion 20 of the shaft 48
- a back ogive 22 having not only the dampening function but also that of containing a sleeve 24 (which will be described in detail hereinafter)
- a back head 26 a splined
- the back ogive is screwed on the threaded portion of the shaft and the sleeve 24 is pressed inside the ogive, while the splined bar 28 may slide but not rotate inside the ogive.
- the splined bar 28 is an elongated rod member provided with a plurality of longitudinal grooves 40, preferably spaced equally along the circumference.
- the sleeve 24 is a cylindrical member provided with a number of sets 42 of rotating or rolling elements 44 such as balls, rollers, needles, possibly having some taper, and the like.
- the number of sets of rotating or rolling elements corresponds to the number of grooves 40 of the splined bar and conversely, and the sets 42 of rotating or revolving elements 44 are also spaced equally along the circumference.
- each set 42 of rotating or rolling elements 44 comprises a number of freely rotating and circulating balls 44.
- Some of these balls 44 are caged and in turn partially project radially inwardly with respect to the inner surface of the sleeve 24 and engage the grooves 40.
- Lubrication means are of course provided in the sleeve 24, such as little holes 46.
- a second embodiment of the invention provides the sleeve 24 integral with the front head 14 and the shaft having longitudinal grooves like the splined bar 28.
- pneumatic cylinder should be understood as having a broader and general meaning than the mere literal one.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- Transmission Devices (AREA)
- Golf Clubs (AREA)
- Jib Cranes (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT97MI000593 IT237848Y1 (it) | 1997-08-04 | 1997-08-04 | Cilindrico pneumatico con albero non rotante |
ITMI970593U | 1997-08-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0896159A2 true EP0896159A2 (fr) | 1999-02-10 |
EP0896159A3 EP0896159A3 (fr) | 2000-09-27 |
Family
ID=11376453
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98200300A Withdrawn EP0896159A3 (fr) | 1997-08-04 | 1998-02-02 | Cylindre pneumatique à tige de piston non rotative |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0896159A3 (fr) |
IT (1) | IT237848Y1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2825766A1 (fr) * | 2001-06-08 | 2002-12-13 | Lacroix Soc E | Mecanisme a liberation controlee par un effet thermique |
CN114645916A (zh) * | 2022-03-18 | 2022-06-21 | 上汽通用五菱汽车股份有限公司 | 一种传动机构的对接结构及其对接传动方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4119017A (en) * | 1977-03-23 | 1978-10-10 | Phd, Inc. | Non-rotatable fluid power cylinder |
FR2607877B1 (fr) * | 1986-12-05 | 1993-02-12 | Forest Line Sa | Verin hydraulique ou pneumatique dont l'element mobile en translation est immobilise en rotation autour de son axe longitudinal |
DE3814184A1 (de) * | 1988-04-27 | 1989-11-09 | Festo Kg | Vorschubeinrichtung |
DE3820337A1 (de) * | 1988-06-15 | 1989-12-21 | Expert Maschbau | Kolben-zylinder-einheit mit gegen verdrehung gesicherter kolbenstange |
DE29517615U1 (de) * | 1995-11-07 | 1995-12-21 | Festo Kg, 73734 Esslingen | Fluidbetätigter Arbeitszylinder |
-
1997
- 1997-08-04 IT IT97MI000593 patent/IT237848Y1/it active IP Right Grant
-
1998
- 1998-02-02 EP EP98200300A patent/EP0896159A3/fr not_active Withdrawn
Non-Patent Citations (1)
Title |
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None |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2825766A1 (fr) * | 2001-06-08 | 2002-12-13 | Lacroix Soc E | Mecanisme a liberation controlee par un effet thermique |
EP1264999A3 (fr) * | 2001-06-08 | 2004-02-25 | Etienne Lacroix - Tous Artifices Sa | Mécanisme à libération controlée par un effet thermique |
CN114645916A (zh) * | 2022-03-18 | 2022-06-21 | 上汽通用五菱汽车股份有限公司 | 一种传动机构的对接结构及其对接传动方法 |
Also Published As
Publication number | Publication date |
---|---|
ITMI970593U1 (it) | 1999-02-04 |
EP0896159A3 (fr) | 2000-09-27 |
IT237848Y1 (it) | 2000-09-29 |
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Legal Events
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PUAL | Search report despatched |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20000902 |