EP0117152A1 - Hydraulic motor - Google Patents

Hydraulic motor Download PDF

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Publication number
EP0117152A1
EP0117152A1 EP84301108A EP84301108A EP0117152A1 EP 0117152 A1 EP0117152 A1 EP 0117152A1 EP 84301108 A EP84301108 A EP 84301108A EP 84301108 A EP84301108 A EP 84301108A EP 0117152 A1 EP0117152 A1 EP 0117152A1
Authority
EP
European Patent Office
Prior art keywords
crank pin
hydraulic
drive shaft
cylinders
hydraulic motor
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Withdrawn
Application number
EP84301108A
Other languages
German (de)
English (en)
French (fr)
Inventor
Roy Hemingway
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
South African Inventions Development Corp
Original Assignee
South African Inventions Development Corp
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 South African Inventions Development Corp filed Critical South African Inventions Development Corp
Publication of EP0117152A1 publication Critical patent/EP0117152A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F03C1/0403—Details, component parts specially adapted of such engines
    • F03C1/0419—Arrangements for pressing or connecting the pistons against the actuated cam
    • 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
    • F03C1/22—Reciprocating-piston liquid engines with movable cylinders or cylinder
    • F03C1/223—Reciprocating-piston liquid engines with movable cylinders or cylinder having cylinders in star or fan arrangement, the connection of the pistons with an actuated element being at the inner ends of the cylinders

Definitions

  • This invention relates to hydraulic radial piston motors.
  • Swiss Patent 249710 to Leo Widmer which describes a rotary motor which has single acting rams located radially about a plate, the outer ends of the rams being pivotally connected to the housing of the motor.
  • the rams are arranged to rotate a shaft.
  • an extension piece is provided which includes a passive piston and cylinder assembly which .is also pivotally connected to the housing.
  • the outer ends of the rams describe elliptical orbits of different shapes.
  • a hydraulic motor comprising a plurality of radially mounted hydraulic cylinders pivoted at their outer ends on a fixed outer circle, a drive shaft concentric with the outer circle, a main crank pin fixed eccentrically to the drive shaft, and a plate secured to the main crank and on which the inner ends of the hydraulic cylinders are pinned on a circle concentric to the main crank pin so that hydraulic fluid fed to the cylinders cause the shaft to rotate;
  • a connecting rod having its big end pivoted to the main crank pin and its small end pivoted to a small crank pin mounted to rotate eccentrically about a fixed centre of rotation, and means to link the rotary motion of the drive shaft and the small crank pin so that their rotary motions are in phase, i.e. they rotate at the same rate and in the same direction and the crank pins pass through the same dead centre positions simultaneously.
  • the cylinders are preferably double acting and a cam surface rotating with the drive shaft may control the feed to the cylinders.
  • a gear fast with the drive shaft and a gear fast with the small crank pin are in motion transmitting relationship with one another and preferably the two gears are linked by means of an intermediate gear meshing with them both.
  • a hydraulic motor 10 has a frame 12 composed of two parallel plates linked by a plurality of rods 52 on which are radially disposed seven double acting hydraulic cylinders 14.
  • the cylinders 14 are fixed to the frame 12 at pivots 16 and to the big end of a connecting rod 18 at pivot pins 20 which are radially disposed around a main crank pin 22.
  • the main crank pin 22 is eccentrically connected to two discs 24 which are spaced apart and mounted centrally to rotate on the frame 12.
  • One of the discs 24 is connected to the input shaft 26 of the machine to be driven, i.e. the output or drive shaft of the hydraulic motor.
  • the connecting rod 18 is in the form of a yoke having two spaced apart plates which provide a working space for two of the hydraulic cylinders 14.
  • the small end of the connecting rod 18 is connected to a crank pin 28 which is eccentrically connected to two discs 30 which are spaced apart and mounted to rotate on the frame 12.
  • a central disc 24 carries a gear wheel 34 while a disc 30 carries a gear wheel 36.
  • An idler gear wheel 38 connects the gear wheels 34, 36 to each other and maintains the same sense of rotation for these gear wheels at the same speed of rotation.
  • a cam 40 is attached to one or the aiscs 24 as seen in Lne drawings ana a switch 42 is arranged to ride the surface of the cam 40.
  • the switches 42 of which there are seven are connected to valves 44 which control the ports 46 of the cylinders 14 for extending or retracting the piston rods.
  • the discs 24 are mounted to rotate on main bearings 48 while the discs 30 rotate on bearings 50 all of which are fixed to the frame 12.
  • Chains 54 anchor the motor 10 to restrain it from rotating in the direction of the output shaft 26.
  • a load cell 56 may be fixed to the chain 54 for registering the output torque of the motor 10.
  • hydraulic fluid under pressure is fed through the hydraulic valves 46 to the cylinders 14 to either extend or retract the piston rods of the cylinders 14 depending on the position of the cam 40 and the switches 42.
  • the switch 42 for this cylinder will change the direction of movement of the piston rods from the retracting to the extending mode.
  • the cylinders 14 lying to the left hand side of the drawing are extending their piston rods while those to the right are retracting their rods. It will thus be seen that the modes of the piston rods change sequentially to enable all the cylinders 14 to exert forces in the direction of rotation.
  • the connecting rod 18 having its small and big ends linked by the gear train constrains the pins 20 to describe circular orbits. This is in contrast to prior art radial hydraulic motors in which the pins describe elliptical orbits of different shapes.
  • the motor of the invention has a relatively smooth power curve and can rotate large and heavy machinery at speeds as slow as 1 rpm or less.
  • a motor of the invention rotates a sugar crystalliser vessel with a total volume of 135 m 3 at a speed of 1 to 1,5 rpm and with a torque of up to 275 kNm.
  • the hydraulic efficiency of the motor is also extremely high.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydraulic Motors (AREA)
  • Transmission Devices (AREA)
EP84301108A 1983-02-21 1984-02-21 Hydraulic motor Withdrawn EP0117152A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA831138 1983-02-21
ZA831138 1983-02-21

Publications (1)

Publication Number Publication Date
EP0117152A1 true EP0117152A1 (en) 1984-08-29

Family

ID=25576556

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84301108A Withdrawn EP0117152A1 (en) 1983-02-21 1984-02-21 Hydraulic motor

Country Status (4)

Country Link
EP (1) EP0117152A1 (ja)
JP (1) JPS59213952A (ja)
AU (1) AU2474784A (ja)
BR (1) BR8400756A (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2185075A (en) * 1986-01-07 1987-07-08 John Douglas Woodward A fluid pump/motor
CN102287408A (zh) * 2011-08-09 2011-12-21 泸州天府液压件有限公司 液压随动回转机构
CN107191561A (zh) * 2017-06-20 2017-09-22 叶选锐 一种偏心力盘
CN107542660A (zh) * 2016-06-24 2018-01-05 王辉明 转子滑轨式空气压缩机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2235486A (en) * 1938-05-18 1941-03-18 Lawrance Engineering And Res C Connecting rod structure for engines
GB650810A (en) * 1946-03-09 1951-03-07 Schweizerische Lokomotiv Improvements in or relating to fluid-driven piston motors
GB914373A (en) * 1959-08-31 1963-01-02 Richier Sa Improvements in or relating to hydraulic motors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2235486A (en) * 1938-05-18 1941-03-18 Lawrance Engineering And Res C Connecting rod structure for engines
GB650810A (en) * 1946-03-09 1951-03-07 Schweizerische Lokomotiv Improvements in or relating to fluid-driven piston motors
GB914373A (en) * 1959-08-31 1963-01-02 Richier Sa Improvements in or relating to hydraulic motors

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2185075A (en) * 1986-01-07 1987-07-08 John Douglas Woodward A fluid pump/motor
GB2185075B (en) * 1986-01-07 1989-10-25 John Douglas Woodward Fluid pump/motor
CN102287408A (zh) * 2011-08-09 2011-12-21 泸州天府液压件有限公司 液压随动回转机构
CN102287408B (zh) * 2011-08-09 2014-04-02 泸州天府液压件有限公司 液压随动回转机构
CN107542660A (zh) * 2016-06-24 2018-01-05 王辉明 转子滑轨式空气压缩机
CN107191561A (zh) * 2017-06-20 2017-09-22 叶选锐 一种偏心力盘

Also Published As

Publication number Publication date
BR8400756A (pt) 1984-09-25
JPS59213952A (ja) 1984-12-03
AU2474784A (en) 1984-08-30

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE FR GB IT LI SE

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HEMINGWAY, ROY

17P Request for examination filed

Effective date: 19850211

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

18D Application deemed to be withdrawn

Effective date: 19860805

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HEMINGWAY, ROY