WO1988001698A1 - Dispositifs actionnes par un fluide - Google Patents

Dispositifs actionnes par un fluide Download PDF

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Publication number
WO1988001698A1
WO1988001698A1 PCT/GB1987/000618 GB8700618W WO8801698A1 WO 1988001698 A1 WO1988001698 A1 WO 1988001698A1 GB 8700618 W GB8700618 W GB 8700618W WO 8801698 A1 WO8801698 A1 WO 8801698A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder
piston
casing
drive belt
return path
Prior art date
Application number
PCT/GB1987/000618
Other languages
English (en)
Inventor
Douglas Cecil Clarke
Original Assignee
Clarke Douglas C
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 Clarke Douglas C filed Critical Clarke Douglas C
Publication of WO1988001698A1 publication Critical patent/WO1988001698A1/fr

Links

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
    • F15B15/084—Characterised by the construction of the motor unit the motor being of the rodless piston type, e.g. with cable, belt or chain

Definitions

  • Rodless cylinders have been known for some time and comprise a casing on which is mounted a rectilinearly movable take-off element and fluid operable piston within the casing. To date, all designs transmit the movement of the piston to the power take-off element via a rectilinearly moving drive which passes, through the casing. This creates considerable sealing problems.
  • the invention consists in a rodless cylinder including a casing, a piston disposed in the casing, a power take-off element mounted for rectilinear external movement on the casing, drive means connecting the piston and the power take-off element, the drive means being constructed such that all rectilinear motion takes place either within or outside the casing.
  • the drive means includes a drive belt coupled to the piston and contained entirely, within the casing, a shaft extending through the casing for rotation by the drive belt in response to movement of the piston and coupling means for rectilinearly driving the .power take-off element along the casing in response to rotation of the shaft.
  • the casing may define first and second fluid reservoirs having respective fluid parts, a cylinder, for receiving the piston, extending -between the. reservoirs and a return path connected in parallel to the cylinder, and further including sealing means in the return path for forming a seal between the reservoirs, the drive belt extending from one side of the piston along the return path to the other side of the piston such that the introduction of fluid .to one reservoir drives the piston along the cylinder and hence moves the drive belt.
  • the return path may be external to the cylinder or, alternatively, it may lie within the cylinder and extend through the piston.
  • the return path may constitute a fluid flow path which is sealed by the sealing means, in which case the sealing means may be slidable within the return path.
  • the sealing means are coupled to or form part of the drive belt means so that they move.with the piston.
  • Figure 1 is a side view of a rodless cylinder
  • Figure 2 is a section along the line II-II
  • Figure 3 is a section along the line III-III of Figure 2;
  • Figure 4 is a section along the line IV-IV of Figure 3;
  • Figure 5 is a view from above of an alternative embodiment
  • Figure 6 is a cross-sectional view along the line VI-VI in Figure 5;
  • Figure 7 is a cross-sectional view along the line VII-VII in Figure 6; and Figure 8 is a cross-sectional view along the line VIII-VIII in Figure 6.
  • Figures 1 to 4 show a rodless cylinder generally indicated at 10.
  • the cylinder has a casing 11 which defines end fluid reservoirs 12,13, a cylinder 14 extending between the reservoirs and a return flow path 15 extending between the reservoirs in parallel to the cylinder 14.
  • Each of the reservoirs 12,13 has a respective fluid port 16,17.
  • a piston 18 is slidably disposed- ithin , the cylinder 14 and has its faces 19.,20 interconnected via a toothed drive belt 21.
  • the drive belt extends from the face 19 along the cylinder, around a gear wheel 22 in fluid reservoir 13, along the return flow path 15, around a further gear wheel 23 in reservoir 12 to the face 20.
  • the drive belt 21 includes a sealing element 24 which is slidably disposed in the return flow path 15 to seal between the reservoirs 12 and 13.
  • the gear wheels 22,23 are mounted on respective shafts 25,26 which extend through the wall of their respective reservoirs to carry output pulleys 27,28, which are external to the casing 11. Standard rotational seals, one of which is shown at 29, surround the shafts 25,26.
  • the output pulleys 27,28 are interconnected by a further drive belt ' 30 which carries a slidable take ⁇ off element 31.
  • the power take ⁇ off element 31 is carried on the casing 11 by a guideway 32.
  • pressurized fluid is introduced . through the port 16 into the reservoir 12 urging the piston 18 along the cylinder 14. Because the cross- section of ' the sealing element 24 is much less than that of the piston 18, the latter is pulled along the flow path 15 by the drive belt 21, whilst maintaining the seal between the reservoirs.
  • the movement imparted to the drive belt 21 by the piston 18 causes rotation of the gear wheels 22,23 and hence of the output pulleys 27,28. It will be appreciated that, these pulleys rotate in the same direction and hence pull the external drive belt 30 in a sense to pull the power take-off element 31 from left to right along the guideway 32.
  • FIGS 6 to 8 illustrate an alternative embodi ⁇ ment in which the return flow path 15 is disposed in the cylinder 11 and passes through an opening 35 in the piston 18.
  • the drive belt can then be pinched inwardly at each end by idlers 36,37 allowing room for a track 38 for the power take-off element 31 between the reservoirs 12,13.
  • a dust guard is provided at 38.
  • the return path may be extremely narrow, i.e. only wideenough to allow free passage of the drive belt 21, in which case, the movable sealing element 24 may be disposed with and the drive belt may pass through a simple slit seal disposed somewhere in the return path.
  • This has the advantage of removing the resistance created by the sliding sealing element 24. To some extent this advantage may be reduced due to leakage of pressure past the seal, but this is not as significant as in the prior art constructions, because the seal is entirely contained within the casing.
  • the external'drive belt 30 can, of course, be extended and by the use of suitable idling rollers can be used to operate a power take-off element removed from the cylinder.
  • drive belt covers any suitable driven member or element, e.g. a chain.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

L'invention se rapporte à des cylindres sans bielle et présente notamment une structure de cylindre dans laquelle il n'y a pas de transmission de mouvement rectiligne à travers le carter. Dans une forme d'exécution le cylindre présente un carter (11) définissant des réservoirs de fluide à chaque extrémité (12, 13), un cylindre (14) s'étendant entre les réservoirs et un conduit d'écoulement de retour (15) s'étendant entre les réservoirs parallèment au cylindre (14). Un piston (18) coulisse dans le cylindre (14) et est relié sur chaque face aux extrémités respectives d'une courroie crantée (21). Cette courroie traverse le cylindre sur toute sa longueur, puis le conduit d'écoulement de retour en passant autour de pignons (22, 23) fixés sur leurs arbres respectifs (25, 26). Ces derniers comportent des poulies de sortie (27, 28) autour desquelles est montée une courroie d'entraînement (30), qui transporte un élément coulissant de prise de force (31). Le déplacement du piston (18) dans le cylindre (14) provoque la rotation des arbres et, partant, le mouvement rectiligne de l'élément de prise de force. Cet agencement permet de monter des joints d'étanchéité rotatifs conventionnels sur l'élément transmettant la force motrice à l'extérieur du carter.
PCT/GB1987/000618 1986-09-05 1987-09-03 Dispositifs actionnes par un fluide WO1988001698A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8621466 1986-09-05
GB868621466A GB8621466D0 (en) 1986-09-05 1986-09-05 Fluid operable devices

Publications (1)

Publication Number Publication Date
WO1988001698A1 true WO1988001698A1 (fr) 1988-03-10

Family

ID=10603755

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1987/000618 WO1988001698A1 (fr) 1986-09-05 1987-09-03 Dispositifs actionnes par un fluide

Country Status (3)

Country Link
AU (1) AU7872587A (fr)
GB (1) GB8621466D0 (fr)
WO (1) WO1988001698A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3905561A1 (de) * 1989-02-23 1990-08-30 Rexroth Pneumatik Mannesmann Druckmittelbetaetigbarer arbeitszylinder
GB2233711A (en) * 1989-05-25 1991-01-16 Clarke Douglas C Rodless piston/cylinder unit
US5022311A (en) * 1989-03-22 1991-06-11 Wabco Westinghouse Steuerungstechnik Gmbh & Co. Compact fluid actuated working cylinder with spring loaded tensioning member
DE4027617A1 (de) * 1990-08-31 1992-04-09 Airtec Pneumatic Gmbh Bremseinrichtung fuer einen fluidgetriebenen kolbenstangenlosen arbeitszylinder
DE4027636A1 (de) * 1990-08-31 1992-04-09 Airtec Pneumatic Gmbh Fluidgetriebener kolbenstangenloser arbeitszylinder
WO1993009352A1 (fr) * 1991-10-28 1993-05-13 Leif Gullblom Element d'accouplement
WO1993009351A1 (fr) * 1991-10-28 1993-05-13 Leif Gullblom Element d'accouplement

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB932201A (en) * 1961-05-18 1963-07-24 Charles Harold Graham Power translator
FR1474202A (fr) * 1966-02-09 1967-03-24 Rech S Et De Realisations Elec Vérin perfectionné
GB1117863A (en) * 1965-09-14 1968-06-26 Graham Engineering Company Inc Improvements in tensioning means for chain, belt or the like drives
DE2800318A1 (de) * 1978-01-04 1979-07-12 Erhard Rilling Pneumatische oder hydraulische zylinder/kolben-anordnung mit abtriebswelle
DE2807139A1 (de) * 1978-02-20 1979-08-23 Thomas Kolsen Pneumatisches hubgetriebe mit gegenkolben
DE3005193A1 (de) * 1979-06-19 1981-01-15 Dobljekar M Kolbenstangenloser antriebszylinder

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB932201A (en) * 1961-05-18 1963-07-24 Charles Harold Graham Power translator
GB1117863A (en) * 1965-09-14 1968-06-26 Graham Engineering Company Inc Improvements in tensioning means for chain, belt or the like drives
FR1474202A (fr) * 1966-02-09 1967-03-24 Rech S Et De Realisations Elec Vérin perfectionné
DE2800318A1 (de) * 1978-01-04 1979-07-12 Erhard Rilling Pneumatische oder hydraulische zylinder/kolben-anordnung mit abtriebswelle
DE2807139A1 (de) * 1978-02-20 1979-08-23 Thomas Kolsen Pneumatisches hubgetriebe mit gegenkolben
DE3005193A1 (de) * 1979-06-19 1981-01-15 Dobljekar M Kolbenstangenloser antriebszylinder

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3905561A1 (de) * 1989-02-23 1990-08-30 Rexroth Pneumatik Mannesmann Druckmittelbetaetigbarer arbeitszylinder
US5035171A (en) * 1989-02-23 1991-07-30 Wabco Westinghouse Steuerungstechnik Gmbh & Co. Working cylinder and tension member therefor
US5022311A (en) * 1989-03-22 1991-06-11 Wabco Westinghouse Steuerungstechnik Gmbh & Co. Compact fluid actuated working cylinder with spring loaded tensioning member
GB2233711A (en) * 1989-05-25 1991-01-16 Clarke Douglas C Rodless piston/cylinder unit
DE4027617A1 (de) * 1990-08-31 1992-04-09 Airtec Pneumatic Gmbh Bremseinrichtung fuer einen fluidgetriebenen kolbenstangenlosen arbeitszylinder
DE4027636A1 (de) * 1990-08-31 1992-04-09 Airtec Pneumatic Gmbh Fluidgetriebener kolbenstangenloser arbeitszylinder
US5178056A (en) * 1990-08-31 1993-01-12 Airtec Pneumatik Gmbh Fluid driven working cylinder without a piston rod
EP0472862B1 (fr) * 1990-08-31 1993-05-12 AIRTEC PNEUMATIC GmbH Vérin à piston sans tige alimenté par fluide
WO1993009352A1 (fr) * 1991-10-28 1993-05-13 Leif Gullblom Element d'accouplement
WO1993009351A1 (fr) * 1991-10-28 1993-05-13 Leif Gullblom Element d'accouplement

Also Published As

Publication number Publication date
AU7872587A (en) 1988-03-24
GB8621466D0 (en) 1986-10-15

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