US2806449A - Fluid operated motor - Google Patents
Fluid operated motor Download PDFInfo
- Publication number
- US2806449A US2806449A US491989A US49198955A US2806449A US 2806449 A US2806449 A US 2806449A US 491989 A US491989 A US 491989A US 49198955 A US49198955 A US 49198955A US 2806449 A US2806449 A US 2806449A
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- US
- United States
- Prior art keywords
- piston
- pressure
- tubular
- motor
- cylinder
- 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.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B17/00—Reciprocating-piston machines or engines characterised by use of uniflow principle
- F01B17/02—Engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B17/00—Reciprocating-piston machines or engines characterised by use of uniflow principle
Definitions
- the present invention relates to fluid apparatus, and, more particularly, to a reciprocating fluid motor which may directly actuate, or serve ⁇ as a servo-motor for actuating, any ⁇ of an infinite variety of mechanisms.
- this invention relates to a three-position lluid motor that can be controlled by a simple fourway valve.
- Figure l is a longitudinal section of a fluid pressure motor embodying this invention and showing the motor in its intermediate position.
- Figure 2 is a View corresponding to Figure l but showing the motor ⁇ in one of its two extreme positions.
- Figure 3 is a view corresponding to Figure l, but showing the motor in the other extreme position.
- Figure 4 is a schematic showing of a hydraulic control circuit for operating the motor shown in Figure l.
- a fluid pressure motor 10 ernbodying this invention comprises an elongated hollow cylinder 12, having the forward end thereof closed, as by a plug 14, :and having the rear end thereof closed, as
- plug 16 Preferably, the plugs 14 and 16 seat againstcorresponding interior shoulders 18 formed by counterbores in the ends of the cylinder and are retained in place by split snap rings 20 and 22, respectively.
- the plugs 14 and 16 are sealed to the cylinder by O-rings 24 and 26, respectively, disposed in circumferential grooves in the plugs and engaging the interior counterb'ored surfaces of the cylinder.l
- the cylinder, between the plugs 14 and 16, has 'a smooth-walled bore 27 of uniform diameter and has a side wall port 28 adjacent one end of the bore just inwardly of the plug 14 and has a side wall port 30 located at or near the mid-point ⁇ of the length of the bore 27.
- the end plug 16 has its inner face recessed, las at 32, to receive the stub end 34 of a piston rod 36, and has atent ice a longitudinally extending port 38 formed therein. Ports 28, 30 and 38 may be suitably tapped to receive a threaded end of a pressure-fluid conduit, as will be discussed hereinafter.
- port 38 is illustrated as being in the end plug 16 and port 28 is indicated as being in the side wall of the bore 27, it is entirely within the contemplation of this invention that the relative position of these ports may be reversed, or that both ports may be in either the end plugs or in the bore side wall.
- tubular pistons 40 and 42 Slidably disposed within the cylinder 12 is a pair of tandemly 'aligned tubular pistons 40 and 42, which preferably are identical for convenience of manufacture and interchangeability.
- the inner, or neighboring, ends vof the tubular pistons have inwardly extending abutment means which preferably consist of circumferential anges 44 and 46, respectively.
- the tubular pistons 40 and 42 are also provided with exterior peripheral collars 47 and 48, respectively, which are longitudinally located somewhat inwardly of the outer ends of their respective pistons.
- the collar 47 is located somewhat inwardly of the port 28 so that pressure-fluid admitted therethrough will act on the outer ends of the piston 40 when the latter abuts the end plug 14, as shown in Figures 1 and 2.
- the collars 47 and 48 may be suitably iixed to the tubular pistons 40 and 42, respectively, or may be cast, or otherwise formed, integral therewith.
- the peripheral surfaces of the collars 47 and 48 are provided with circumferential grooves having O-ring seals 50 and 52, respectively, therein which serve as piston rings to seal with ⁇ the cylinder bore 27.
- An imperforate piston 54 having a piston rod 36 iixed thereto or formed integrally therewith, is disposed coaXially within the tubular pistons 40 and 42.
- the piston rod 36 extends outside the cylinder 12, for connection to any mechanism to be operated, through a central aperture S6 in the forward end plug 14.
- the inner periphery of the aperture is provided with a circumferential groove having ⁇ an O-ring seal 58 therein.
- the piston 54 extends between, and within, the two tubular pistons 40 and 42, when the latter are in their spaced positions shown in Figure l.
- the piston 54 is formed as :a smooth cylinder dimensioned to slide within the franges 44 and 46, and has its ends provided with abutments 60 and 62 extending radially therefrom a sufficient distance to engage the llanges.
- at least one of the abutments is detachable for assembly purposes.
- the abutment 60 may consist of a collar formed integral with the piston, while the abutment 62 consists of a washer mounted on a stub end of the piston rod 36 and fixed thereto, as by a snap ring 64, in an abutting relationship to the piston.
- the inner periphery of the flanges 44 and 46 are provided with 'circumferential grooves having O-rings 66 and 68, respectively, therein which sealingly engage the piston 54.
- seals 50 and 52 together with seals 66 and ⁇ 68, serve to segregate the interior of the cylinder 12 into 'three chambers 70, 72 and 76, here termed the forward pressure chamber, the intermediate 76 will vary during the operation of the motor, although the Sum total of their volumes remains constant, except as affected by the volumetric displacement of the piston rod 36.
- the seals alone define the pressure chambers, and all sliding or -contacting metal surfaces, not provided with seals, allow the pressurized duid to pass freely therebetween.
- the tubular piston 40 has been illustrated ( Figures 1 and 2) Vas abutting the forward end plug 14, it should be clear that no pressure seal is affected lbetween these two members, and it is within the contemplation of this invention that the outer end faces of the tubular pistons 40 and 42 may he radially grooved or otherwise formed, if necessary, to allow a yfree flow of pressurized fluid around their ends.
- FIG. 4 in which there is illustrated av schematic diagram of the uid pressure motor operatively connected into a hydraulic circuit including a simple control valve 78 for operating the motor, it ywill be seen that the motor has its intermediate port 30 constantly in direct fluid communication, via conduits 30 and 82, with a source of pressure-fluid, here shown as the discharge side of a pump '84, which withdraws fluid from a sump yor reservoir 86.
- the discharge side of the pump 84 is also in direct fluid communication, through supply conduit 88, with the inlet 90 of a conventional three-piston control valve 78 which has two control ports 92 and 94 that are connected, via conduits 96 and 98, respectively, with the motor ports 28 and 38, respectively, and has a vent port 100 that isV constantly in communication with atmospheric pressure, as by a return conduit 182 to the sump 86.
- adiustable pressure release valve 164 is connected into a bypass conduit 106 that is connected between the conduits 82 and 102 to maintain a substantially constant operating pressure for the motor.
- the control valve 78 may he set in either of three positions: In the first, the forward pressure chamber 70 ofthe motor is connected to the pressure fluid source and the rear pressure chamber 76 is vented; in the second, both the forward pressure chamber 7i) and the rear pressure chamber 76 are vented; while in lthe third, the rear pressure chamber 76 is pressurized and the forward pressure chamber 70 is vented. It is again pointed out that the intermediate pressure chamber 72 is constantly pressurized. In Figure 4, the valve 78 is illustrated in the second position. Phantom lines illustrate the disposition of the valve when in the first and third positions.
- the control valve 78 is selectively manipulated to the proper position, whereby one ⁇ of the end pressure chambers is vented and the other is supplied with pressurized fluid. If, for example, it is desired to extend the piston rod 36, that is to move the piston rod, and hence the piston 54, towards the forward end ⁇ of the cylinder, the control valve 78 is manipulated to connect the rear pressure chamber with supply conduit 88, while simultaneously connecting the forward pressure chamber 7@ with the return conduit 102. When these connections are made, pressure chambers 72 and 76 will contain equally pressurized fluid, while pressure chamber 70 will contain Huid at substantially the vent or atmospheric pressure.
- the control valve 78 is manipulated to supply the forward pressure chamber with pressurized Y fluid while simultaneously connecting the rear pressure chamber 76' to the return conduit 102.
- the pressure differential between the forward pressure chamber 70 and the rear pressure chamber 76 will result in unbalanced forces upon the planar end of the piston 54 which will move it towards the rear end of the cylinder.
- the pressure differential between the intermediate pressure chamber 72 and the rear pressure chamber 76 will result in unbalanced axial forces upon the tubular piston 42 which will act to move it towards the rear end ofthe cylinder. 62, the tubular piston 42 cannot proceed ahead of the piston 54, rather, it will move with it maintaining a substantially constant relative position therewith.
- the piston 54 moves into the retracted position, its collar 60, in abutting engagement with flange 44, will pull the tubular piston 40 along with it.
- the control valve 78 is manipulated to vent both end ports 28 and 38.
- the intermediate port 30 is constantly in direct fluid communication with the discharge side of the pump 84, the inter'- mediate pressure chamber 72 will always be supplied with pressurized fluid.
- This pressure in the intermediate pressure chamber72 results in unbalanced axial forces on the tubular pistons.
- One of the tubular pistons is held fast in its position abutting its end plug, and the other tubular piston is moved towards the opposite end of the cylinder.
- the tubular piston which is so moved will pull the piston 54, by engagement of its flange with the collar (60 or 62), in the manner discussed hereinabove, so that the respective elements will arrange themselves in the intermediate position illustrated in Figure 1.
- a uid pressure motor comprising a cylinder having closed ends; rst and second opposed tubular pistons therein; a third imperforate piston of smaller diameter than said tubular pistons and telescopingly arranged within said tubular pistons and separating the interior of said cylinder into two end pressure chambers and an intermediate pressure chamber; means for connecting each of said chambers with a source of iiuid under pressure; a piston rod connected to said third piston and extending through one of said cylinder ends; a lost motion connection between said third piston and each of said tubular pistons for movement of each of the latter with said third piston when said third piston moves toward the correspondingly opposite end of said cylinder, said lost motion connection being engageable between the third piston and a given tubular piston when the end of the third piston most remote from the given tubular piston moves away from the given tubular piston.
- the structure deiined in claim 1 including means for supplying the intermediate chamber with pressure uid and means for supplying pressure iluid to and eX- hausting pressure from the end pressure chambers.
- the structure dened in claim 1 including means for constantly supplying the intermediate chambers with pressure uid and means for alternately supplying pressure uid to one of the end chambers while venting the other, supplying pressure uid to said other end chamber while venting the one, and venting both of said end chambers.
- a fluid pressure motor comprising a closed cylinder having end ports and an intermediate port; a pair of tandemly aligned tubular pistons within said cylinder; an imperforate piston of smaller diameter than said tubular pistons and telescopingly arranged within each of said tubular pistons and separating the interior of said cylinder into two end pressure chambers and an intermediate pressure chamber; said intermediate port being in constant communication with said intermediate chamber; said intermediate port being constantly connected to a source of fluid pressure; limit means to prevent the complete withdrawal of said imperforate piston from either of said tubular pistons; and sliding sealing means between each of said tubular pistons and said imperforate piston.
- limit means comprises inwardly extending abutments on the neighboring ends of each of the tubular pistons and spaced outwardly extending abutments on said imperforate piston for engagement with said first-mentioned abutments.
- each of the first-mentioned abutments comprises a circumferential iiange having the sealing means disposed in the periphery thereof.
- a iluid pressure motor comprising a closed cylinder; a pair of tandemly aligned tubular pistons, said tubular pistons being slidably sealingly disposed within said cylinder; a third piston having one end slidably sealingly disposed within one of said tubular pistons and having the other end slidably sealingly disposed within the other of said tubular pistons, limit means for preventing a complete withdrawal of said third piston from either of said tubular pistons and forming lost motion connections therebetween; said limit means comprising outwardly eX- tending formations on the exterior periphery of the third piston having an exterior diameter less than lthe interior diameter of said tubular piston, and inwardly extending projections formed on the interior periphery of said tubular pistons, and having an interior diameter greater than the diameter of said third piston; said cylinder having end ports at each end thereof to selectively conduct pressure iiuid to axially urge all of said pistons towards the opposite end of said cylinder; said cylinder having an intermediate port for conducting
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Description
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US491989A US2806449A (en) | 1955-03-03 | 1955-03-03 | Fluid operated motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US491989A US2806449A (en) | 1955-03-03 | 1955-03-03 | Fluid operated motor |
Publications (1)
Publication Number | Publication Date |
---|---|
US2806449A true US2806449A (en) | 1957-09-17 |
Family
ID=23954498
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US491989A Expired - Lifetime US2806449A (en) | 1955-03-03 | 1955-03-03 | Fluid operated motor |
Country Status (1)
Country | Link |
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US (1) | US2806449A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3152520A (en) * | 1961-04-05 | 1964-10-13 | Gen Dynamics Corp | Three position actuator |
US3364943A (en) * | 1966-03-01 | 1968-01-23 | Salem Valve Company | Three-position fluid actuators for valves and the like |
US3731592A (en) * | 1971-10-28 | 1973-05-08 | Schenck Gmbh Carl | Valving mechanism for hydraulic storage means, especially for hydraulic testing apparatus |
JPS5697605A (en) * | 1979-12-29 | 1981-08-06 | Hideo Sunaga | Air supplying method for step cylinder |
US4533377A (en) * | 1984-01-20 | 1985-08-06 | Maul Technology Corporation | Neck ring mechanism for I.S. glass forming machine |
US4651906A (en) * | 1984-11-06 | 1987-03-24 | Bima Maschinenfabrik Gmbh | Arrangement for applying adhesive medium, particularly for leather and shoe articles |
US4842636A (en) * | 1987-10-02 | 1989-06-27 | Maul Technology Co. | Hydraulic invert/neckring mechanism |
US5014602A (en) * | 1989-01-13 | 1991-05-14 | Akebono Brake Industry Co., Ltd. | Hydraulic cylinder unit capable of being set in three positions |
US5020419A (en) * | 1988-05-31 | 1991-06-04 | Fiatgeotech - Tecnologie Per La Terra S.P.A. | Three position fluid-controlled actuator |
US5957028A (en) * | 1995-03-04 | 1999-09-28 | Hydraulik-Ring Antriebs- Und Steuerungstechnik Gmbh | Actuator for gear shifting mechanisms for motor vehicles |
US20060169132A1 (en) * | 2005-01-29 | 2006-08-03 | Tucker David R | Linear hydraulic actuator |
US20090031893A1 (en) * | 2007-07-31 | 2009-02-05 | Sauer-Danfoss Inc. | Swashplate type axial piston device having apparatus for providing three operating displacements |
US20090293969A1 (en) * | 2005-08-09 | 2009-12-03 | Fmc Technologies Sa | Emergency Disconnection System |
US20180156248A1 (en) * | 2016-12-05 | 2018-06-07 | Eaton Corporation | Hydraulic cylinder |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US767732A (en) * | 1902-07-10 | 1904-08-16 | Robert C Bromley | Centralizing operating mechanism for valves. |
US2524488A (en) * | 1948-03-13 | 1950-10-03 | Westinghouse Air Brake Co | Fluid pressure control apparatus |
-
1955
- 1955-03-03 US US491989A patent/US2806449A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US767732A (en) * | 1902-07-10 | 1904-08-16 | Robert C Bromley | Centralizing operating mechanism for valves. |
US2524488A (en) * | 1948-03-13 | 1950-10-03 | Westinghouse Air Brake Co | Fluid pressure control apparatus |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3152520A (en) * | 1961-04-05 | 1964-10-13 | Gen Dynamics Corp | Three position actuator |
US3364943A (en) * | 1966-03-01 | 1968-01-23 | Salem Valve Company | Three-position fluid actuators for valves and the like |
US3731592A (en) * | 1971-10-28 | 1973-05-08 | Schenck Gmbh Carl | Valving mechanism for hydraulic storage means, especially for hydraulic testing apparatus |
JPS5697605A (en) * | 1979-12-29 | 1981-08-06 | Hideo Sunaga | Air supplying method for step cylinder |
US4533377A (en) * | 1984-01-20 | 1985-08-06 | Maul Technology Corporation | Neck ring mechanism for I.S. glass forming machine |
US4651906A (en) * | 1984-11-06 | 1987-03-24 | Bima Maschinenfabrik Gmbh | Arrangement for applying adhesive medium, particularly for leather and shoe articles |
US4842636A (en) * | 1987-10-02 | 1989-06-27 | Maul Technology Co. | Hydraulic invert/neckring mechanism |
US5020419A (en) * | 1988-05-31 | 1991-06-04 | Fiatgeotech - Tecnologie Per La Terra S.P.A. | Three position fluid-controlled actuator |
US5014602A (en) * | 1989-01-13 | 1991-05-14 | Akebono Brake Industry Co., Ltd. | Hydraulic cylinder unit capable of being set in three positions |
AU617234B2 (en) * | 1989-01-13 | 1991-11-21 | Akebono Brake Industry Co., Ltd. | Hydraulic cylinder unit capable of being set in three positions |
US5957028A (en) * | 1995-03-04 | 1999-09-28 | Hydraulik-Ring Antriebs- Und Steuerungstechnik Gmbh | Actuator for gear shifting mechanisms for motor vehicles |
US20060169132A1 (en) * | 2005-01-29 | 2006-08-03 | Tucker David R | Linear hydraulic actuator |
US20090293969A1 (en) * | 2005-08-09 | 2009-12-03 | Fmc Technologies Sa | Emergency Disconnection System |
US8336579B2 (en) * | 2005-08-09 | 2012-12-25 | Fmc Technologies Sa | Emergency disconnection system |
US20090031893A1 (en) * | 2007-07-31 | 2009-02-05 | Sauer-Danfoss Inc. | Swashplate type axial piston device having apparatus for providing three operating displacements |
US7730826B2 (en) * | 2007-07-31 | 2010-06-08 | Sauer-Danfoss Inc. | Swashplate type axial piston device having apparatus for providing three operating displacements |
US20180156248A1 (en) * | 2016-12-05 | 2018-06-07 | Eaton Corporation | Hydraulic cylinder |
US10677271B2 (en) * | 2016-12-05 | 2020-06-09 | Eaton Intelligent Power Limited | Hydraulic cylinder |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: COTINENTAL BANK N.A. Free format text: SECURITY INTEREST;ASSIGNOR:HARRIS WASTE MANAGEMENT GROUP INC., THE, A CORP. OF MN;REEL/FRAME:005891/0829 Effective date: 19911023 Owner name: CONTINENTAL BANK N.A. Free format text: SECURITY INTEREST;ASSIGNOR:HARRIS WASTE MANAGEMENT GROUP INC., THE, A CORP. OF MN;REEL/FRAME:005891/0795 Effective date: 19911023 |
|
AS | Assignment |
Owner name: HARRIS WASTE MANAGEMENT GROUP, INC., THE, CALIFORN Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:BANK OF AMERICA;REEL/FRAME:007297/0274 Effective date: 19940929 Owner name: SANWA BUSINESS CREDIT CORPORATION, ILLINOIS Free format text: SECURITY INTEREST;ASSIGNOR:HARRIS WASTE MANAGEMENT GROUP, INC., THE;REEL/FRAME:007297/0286 Effective date: 19940930 |
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AS | Assignment |
Owner name: HARRIS WASTE MANAGEMENT GROUP, INC., GEORGIA Free format text: RELEASE AND REASSIGNMENT OF A CONTINUING SECURITY INTEREST AND COLLATERAL ASSIGNMENT OF PATENTS, TRADEMARKS, COPYRIGHTS AND LICENSES;ASSIGNOR:SANWA BUSINESS CREDIT CORPORATION;REEL/FRAME:011333/0525 Effective date: 19950608 |