US3593621A - Hydraulic motor - Google Patents

Hydraulic motor Download PDF

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Publication number
US3593621A
US3593621A US797595A US3593621DA US3593621A US 3593621 A US3593621 A US 3593621A US 797595 A US797595 A US 797595A US 3593621D A US3593621D A US 3593621DA US 3593621 A US3593621 A US 3593621A
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United States
Prior art keywords
ports
groups
fluid
distributor
passageways
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Expired - Lifetime
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US797595A
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English (en)
Inventor
Pierre A Praddaude
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Poclain SA
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Poclain SA
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Publication date
Application filed by Poclain SA filed Critical Poclain SA
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Publication of US3593621A publication Critical patent/US3593621A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/0447—Controlling
    • F03C1/045—Controlling by using a valve in a system with several pump or motor chambers, wherein the flow path through the chambers can be changed, e.g. series-parallel

Definitions

  • This invention relates to an fluid motor of the ltind comprising a rotary cylinder block, a plurality of pistons mounted in cylinders in said block and a distributor mounted in said cylinder bloclt for controlling the flow of pressure fluid for operating said pistons, the distributor having a series of ports by means of which said cylinders can be selectively connected with a main fluid supply conduit and a main fluid discharge conduit.
  • the distributor is normally disposed in said cylinder block coaxially with the shaft of the motor and may be of the so-called flat type or cylindrical type, the ports in the distributor being spaced circumferentially about the periphery of a cylinder depending upon the type of distributor.
  • Fluid motors provided with a cylindrical distributor adapted to permit the motor to be driven at different speeds with a given delivery of pressure fluid from a pump are already known, for example from our prior French Pat. No. 1,460,752. With such known motors certain pistons do not operate when the motor runs at maximum speed and whilst in such cases provisions are made to prevent overheating of the pistons a certain imbalance producing vibrations may result.
  • the main object of the present invention is to overcome this disadvantage and with this object in view the fluid motor according to the invention comprises a rotary cylinder block a plurality of pistons mounted in cylinders in said block and a distributor mounted in said cylinder bloclt coaxial with the shaft of the motor for controlling the flow of pressure fluid for operating said pistons, wherein said distributor is provided with at least three groups of ports arranged to be put into communication successively with the cylinders of said plurality of pistons, one of said groups of ports being permanently connected with a fluid supply or a fluid discharge conduit, whilst at least one of the other groups of ports can be connected selectively to one or other of said fluid supply or discharge conduits.
  • FIG. ii is an axial section of a motor according to the inventlon
  • FIG. 2 is a sectional view on the line ll-Il of lFlG. l;
  • F IG. 3 is a sectional view on the line III-Ill of FIG. 2.
  • the fluid motor comprises a rotary cylinder block ll having a plurality of radial cylinders 3 in which operate pistons 2.
  • the pistons 2 are held in engagement with a system of rollers 41 which permanently engage undulat' ing cam surfaces 5 formed on the inner wall of the motor casing.
  • Each of the cylinders 3 has a port in which, during rotation of the cylinder block 1, moves successively in front of channels 7 formed in the outer surface of a cylindrical distributor d mounted in the cylinder block i coaxial with the shaft of the motor.
  • the channels 7 are distributed regularly around the periphery of the distributor 8 and certain of them are of greater width than others for the reason which will be apparent from the following description.
  • a slide valve Slidably mounted in a cylindrical bore 9 within the distributor d is a slide valve it) having an annular channel ltlln formed therein intermediate its ends.
  • the valve ill has a head portion 1% which forms a piston upon which pressure fluid, delivered through a conduit ll, acts to control movement of the valve against the action of a compression spring M housed in an axial bore in said valve.
  • annular channels Il a, 9b, and 9c are formed in the cylindrical wall of the bore 9 in the cylindrical wall of the bore 9 in three annular channels Il a, 9b, and 9c are formed.
  • the first channel ha is in permanent communication with a main supply conduit 13 for pressure fluid and the last channel 90 is in communication with a main fluid discharge conduit 14
  • Port 115a connects conduit 13 with channel 9a and ports il5b and ll5c open into channels 9b and 90 respectively which communicate with channels 7a, 7b and 70 respectively.
  • each of the groups may comprise any number of ports preferably distributed in a regular pattern within each group.
  • each of the groups may comprise any number of ports preferably distributed in a regular pattern within each group.
  • channel 7a following a channel 7b, it communicates with a channel 7c to permit fluid within the cylinder to flow through channel 70, a passageway R50 and annular passageway 90, into discharge passageway lid.
  • two groups of ports in the distributor will be permanently connected with said main conduits, the other groups being connected selectively to each of said conduits as described above.
  • hydraulic motor described above comprises a cylindrical distributor housed within the cylinder block of the motor and arranged coaxially of its shaft
  • the invention can be applied equally well to a motor provided with a so-called flat distributor.
  • a fluid motor comprising a housing, a distributor mounted on said housing, a cylinder block rotatably mounted on said distributor, said cylinder block having a plurality of cylinders, each provided with a piston operatively cooperable with a cam surface mounted on said housing, said distributor having at least three groups of passageways, communicable successively with each of said cylinders as said cylinder block rotates on said distributor, a first of said groups of passageways being communicable with a fluid supply passageway, a second of said groups of passageways being communicable with a fluid discharge passageway, and a valve operable to selectively communicate the third of said groups of passageways with said fluid supply or fluid discharge passageways.
  • a fluid motor according to claim 1 wherein the ports of said first group of passageways communicable with said cylinders, are spaced circumferentially, and alternatively relative to the ports of said second and third groups of passageways communicable with said cylinders.
  • a fluid motor according to claim 1 wherein said distributor is provided with first and second cylindrical surfaces, said cylinder block is rotatably mounted on said first cylinder surface, said valve is mounted on said second cylindrical surface, and the terminal ports of said groups of passageways in said distributor are provided on said surfaces.
  • a fluid motor according to claim 4 wherein said second cylindrical surface of said distributor is provided with three annular channels, each communicable with one of said groups of passageways in said distributor, and said valve has a cylindrical surface engageable with and movable along said second cylindrical surface of said distributor, having an annular channel communicable with one of said annular channels and selectively with one of the other two of said annular channels when said valve is moved axially.
  • a fluid motor comprising a rotary cylinder block, a plurality of pistons mounted in cylinders in said block and a distn'butor coaxially mounted in said cylinder block for controlling the flow of fluid under pressure supplied to said pistons, wherein said distributor is provided with a fluid supply passageway, a fluid discharge passageway and at least three groups of ports arranged to be placed into communication successively with each of the cylinders of said plurality of pistons, one of said groups of ports permanently communicating with one of said fluid supply and fluid discharge passageways, and at least one of the other of said groups of ports being selectively communicable with one of said fluid supply and fluid discharge passageways.
  • a fluid motor according to claim 6 wherein the ports of a first of said groups of ports permanently communicate with said fluid supply passageway and the ports of a second group of ports permanently communicate with said fluid discharge passageway, one of said first and second groups having a number of ports corresponding to the total number of ports of the other two groups of ports.
  • a fluid motor according to claim 6 wherein the ports of each group communicate with a se arate annular channel forme in an Inner wall of said dtstrl utor, and the selective communication of said channels is effected by a slide valve.
  • a fluid motor according to claim 8 wherein said slide valve normally is biased into a first position to communicate a second of said groups of ports with said fluid discharge passageway, and movable into a second position to communicate said second of said groups of ports with said fluid supply passageway.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydraulic Motors (AREA)
  • Reciprocating Pumps (AREA)
US797595A 1968-02-07 1969-02-07 Hydraulic motor Expired - Lifetime US3593621A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR139018 1968-02-07

Publications (1)

Publication Number Publication Date
US3593621A true US3593621A (en) 1971-07-20

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ID=8645678

Family Applications (1)

Application Number Title Priority Date Filing Date
US797595A Expired - Lifetime US3593621A (en) 1968-02-07 1969-02-07 Hydraulic motor

Country Status (5)

Country Link
US (1) US3593621A (enrdf_load_stackoverflow)
DE (1) DE1905455C3 (enrdf_load_stackoverflow)
ES (1) ES363251A1 (enrdf_load_stackoverflow)
FR (1) FR1563866A (enrdf_load_stackoverflow)
GB (1) GB1261044A (enrdf_load_stackoverflow)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3693507A (en) * 1970-08-21 1972-09-26 Deere & Co Radial piston hydraulic device
US3748062A (en) * 1971-07-21 1973-07-24 Case Co J I Self energizing valve means for fluid translating device
US3760691A (en) * 1971-12-17 1973-09-25 Deere & Co Step variable displacement hydraulic motor
US3808951A (en) * 1971-03-02 1974-05-07 L Martin Hydraulic motors
US3880052A (en) * 1971-10-01 1975-04-29 Nutron Corp Fluid devices
US3972186A (en) * 1975-02-28 1976-08-03 Caterpillar Tractor Co. Speed override control for hydraulic motors
US4157056A (en) * 1976-09-21 1979-06-05 Poclain Hydraulics Multi-cylinder hydraulic mechanism
US4318336A (en) * 1980-04-24 1982-03-09 Rudolf Bock Hydraulic motor
US4405288A (en) * 1980-03-03 1983-09-20 Ford Motor Company Variable displacement hydraulic pump and controls therefor
US4532854A (en) * 1982-12-24 1985-08-06 Renold Plc, A British Company of Renold House Selectively operative multi-displacement pump or motor
US4724742A (en) * 1985-10-16 1988-02-16 Poclain Hydraulics Motor or pump mechanism having at least two distinct active cylinder capacities
US4807519A (en) * 1986-10-31 1989-02-28 Mannesmann Rexroth Gmbh Piston machine with changeable displacement
US5186094A (en) * 1991-06-25 1993-02-16 Poclain Hydraulics Pressurized fluid mechanism comprising at least two distinct operational cylinder capacities
US6619184B1 (en) 1999-11-19 2003-09-16 Zf Friedrichshafen Ag Hydraulic radial piston motor
CN106795869A (zh) * 2014-07-31 2017-05-31 波克兰液压工业设备公司 液压机的分配装置
US20170335831A1 (en) * 2014-12-17 2017-11-23 Poclain Hydraulics Industrie Hydraulic device with radial pistons comprising at least one ball bearing
US20240044319A1 (en) * 2020-12-16 2024-02-08 Danfoss Power Solutions (Jiangsu) Co. Ltd. Hydrostatic radial piston unit
US20240328381A1 (en) * 2021-12-16 2024-10-03 Danfoss Power Solutions (Jiangsu) Co., Ltd. Brake mechanism for a radial piston unit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2481755A1 (fr) * 1980-04-30 1981-11-06 Poclain Hydraulics Sa Moteur a fluide sous pression muni d'un dispositif de selection de sa vitesse de rotation
DE3637174A1 (de) * 1986-10-31 1988-05-05 Rexroth Mannesmann Gmbh Kolbenmaschine mit umschaltbarem hubraum

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2160612A (en) * 1934-02-01 1939-05-30 American Eng Co Ltd Hydraulic transmission
US3296937A (en) * 1965-05-28 1967-01-10 Poclain Sa Speed change device for an hydraulic motor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2160612A (en) * 1934-02-01 1939-05-30 American Eng Co Ltd Hydraulic transmission
US3296937A (en) * 1965-05-28 1967-01-10 Poclain Sa Speed change device for an hydraulic motor

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3693507A (en) * 1970-08-21 1972-09-26 Deere & Co Radial piston hydraulic device
US3808951A (en) * 1971-03-02 1974-05-07 L Martin Hydraulic motors
US3748062A (en) * 1971-07-21 1973-07-24 Case Co J I Self energizing valve means for fluid translating device
US3880052A (en) * 1971-10-01 1975-04-29 Nutron Corp Fluid devices
US3760691A (en) * 1971-12-17 1973-09-25 Deere & Co Step variable displacement hydraulic motor
US3972186A (en) * 1975-02-28 1976-08-03 Caterpillar Tractor Co. Speed override control for hydraulic motors
US4157056A (en) * 1976-09-21 1979-06-05 Poclain Hydraulics Multi-cylinder hydraulic mechanism
US4405288A (en) * 1980-03-03 1983-09-20 Ford Motor Company Variable displacement hydraulic pump and controls therefor
US4318336A (en) * 1980-04-24 1982-03-09 Rudolf Bock Hydraulic motor
US4532854A (en) * 1982-12-24 1985-08-06 Renold Plc, A British Company of Renold House Selectively operative multi-displacement pump or motor
US4724742A (en) * 1985-10-16 1988-02-16 Poclain Hydraulics Motor or pump mechanism having at least two distinct active cylinder capacities
US4807519A (en) * 1986-10-31 1989-02-28 Mannesmann Rexroth Gmbh Piston machine with changeable displacement
US5186094A (en) * 1991-06-25 1993-02-16 Poclain Hydraulics Pressurized fluid mechanism comprising at least two distinct operational cylinder capacities
US6619184B1 (en) 1999-11-19 2003-09-16 Zf Friedrichshafen Ag Hydraulic radial piston motor
CN106795869A (zh) * 2014-07-31 2017-05-31 波克兰液压工业设备公司 液压机的分配装置
US20170248241A1 (en) * 2014-07-31 2017-08-31 Poclain Hydraulics Industrie Distribution device for a hydraulic machine
US10563641B2 (en) * 2014-07-31 2020-02-18 Poclain Hydraulics Industrie Distribution device for hydraulic machine
US20170335831A1 (en) * 2014-12-17 2017-11-23 Poclain Hydraulics Industrie Hydraulic device with radial pistons comprising at least one ball bearing
US10578084B2 (en) * 2014-12-17 2020-03-03 Poclain Hydraulics Industrie Hydraulic device with radial pistons comprising at least one ball bearing
US20240044319A1 (en) * 2020-12-16 2024-02-08 Danfoss Power Solutions (Jiangsu) Co. Ltd. Hydrostatic radial piston unit
US20240328381A1 (en) * 2021-12-16 2024-10-03 Danfoss Power Solutions (Jiangsu) Co., Ltd. Brake mechanism for a radial piston unit

Also Published As

Publication number Publication date
DE1905455B2 (de) 1977-12-29
FR1563866A (enrdf_load_stackoverflow) 1969-04-18
DE1905455A1 (de) 1969-08-28
ES363251A1 (es) 1970-12-16
GB1261044A (en) 1972-01-19
DE1905455C3 (de) 1978-08-24

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