EP0046691A2 - Moteur hydraulique - Google Patents

Moteur hydraulique Download PDF

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Publication number
EP0046691A2
EP0046691A2 EP81303879A EP81303879A EP0046691A2 EP 0046691 A2 EP0046691 A2 EP 0046691A2 EP 81303879 A EP81303879 A EP 81303879A EP 81303879 A EP81303879 A EP 81303879A EP 0046691 A2 EP0046691 A2 EP 0046691A2
Authority
EP
European Patent Office
Prior art keywords
rotor
piston
roller
motor
recesses
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Withdrawn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
EP81303879A
Other languages
German (de)
English (en)
Other versions
EP0046691A3 (fr
Inventor
Peter John Chapple
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.)
STAFFA PRODUCTS Ltd
Original Assignee
STAFFA PRODUCTS Ltd
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 STAFFA PRODUCTS Ltd filed Critical STAFFA PRODUCTS Ltd
Publication of EP0046691A2 publication Critical patent/EP0046691A2/fr
Publication of EP0046691A3 publication Critical patent/EP0046691A3/fr
Withdrawn legal-status Critical Current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
    • F03C1/22—Reciprocating-piston liquid engines with movable cylinders or cylinder
    • F03C1/24—Reciprocating-piston liquid engines with movable cylinders or cylinder in which the liquid exclusively displaces one or more pistons reciprocating in rotary cylinders
    • 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
    • F03C1/0428—Supporting and guiding means for the pistons

Definitions

  • This invention concerns improvements in and relating to hydraulic motors, and more especially to hydraulic motors of the kind comprising a rotor incorporating a plurality of radial cylinders, and an outer casing provided'with a circumferential cam track surrounding the periphery of said rotor, each cylinder of the rotor containing a piston having a cam follower for engagement with said cam track, and valve means being provided for supplying pressure fluid to and exhausting it from each of the cylinders of said rotor in timed relation to the rotary movement thereof, whereby during the working cycle of each piston and cylinder, the piston is driven outwardly under fluid pressure, in order, via said cam follower and cam track, to cause relative rotary motion of said rotor and casing, and is then returned by way of said cam track and cam follower to exhaust fluid from the cylinder.
  • Hydraulic motors of the above kind are well known, and are particularly suitable for the transmission of high torque at relatively low speed, such as is required, for example, in the case of wheel motors for heavy duty vehicles.
  • cam followers for transmitting forces between the pistons and the peripheral cam track surrounding the rotor.
  • the cam followers are generally in the form of rolling members such as balls or rollers.
  • Ball-shaped cam followers have the disadvantage that the peripheral cam track is required to be of relatively complicated shape, and is correspondingly expensive to manufacture, as are the ball-seatings in the pistons.
  • cam followers in the shape of rollers have the advantage that a cam of flat transverse profile can be used, with correspondingly reduced friction in the area of contact between the cam and the cam follower. They have the corresponding disadvantage, however, that they need to be maintained accurately in alignment with the axis of the rotor, thus requiring additional guide means for this purpose.
  • roller cam followers In one prior proposal utilising roller cam followers, the rollers have an axial length which is less than the diameter of the corresponding pistons, the rollers being retained captive within the pistons and penetrating into the cylinders of the rotor together therewith.
  • Guide means making sliding contact with the end faces of the rollers are provided on the motor casing at the lateral boundaries of the cam track, in order to maintain the rollers in alignment with the axis of the rotor.
  • Such an arrangement has the disadvantage that the axial length of the rollers, and thus the area of contact with the cam track is relatively small.
  • the area of contact between the guide means and the end faces of the cam followers is necessarily reduced as the rollers penetrate the cylinders of the rotor to approach the rotary axis thereof.
  • each cam follower comprises a roller rotatably mounted within the corresponding piston with its rotary axis in alignment with the rotary axis of the rotor, characterised in that the axial length of each roller is approximately the same as the diameter of the piston within which it is located, that each cylinder of the rotor has lateral recesses to receive the axial ends of the roller mounted within the corresponding piston, that said rotor is further provided with guide means bounding said lateral recesses of the cylinder, and that the end faces of each cam follower roller are arranged to make sliding engagement with said guide means whereby the roller is maintained in axial alignment with the rotary axis of the rotor.
  • the arrangement in accordance with the invention has the advantage that since the guide means for the cam follower rollers are mounted on the rotor, rather than on the motor casing, there is less sliding friction between the guide means and the end faces of the cam follower rollers, with correspondingly lower wear and frictional losses. Moreover, the axial length of the cam follower rollers can be greater than in hitherto known constructions in which the cam followers are arranged to penetrate the cylindrical recesses of the rotor.
  • the axial ends of said rotor have circumferential recesses at the outer periphery of the rotor to define a central portion of generally cylindrical configuration, said central portion containing the outermost portions of said radial -cylinders, the axial dimension of said central portion corresponding substantially to the diameter of said radial cylinders, and said central portion being provided with a plurality of open-ended axially extending grooves or slots extending across the said outermost portions of said radial cylinders to define the above-mentioned lateral recesses.
  • This configuration of the rotor essentially simplifies the machining operations required to form the rotor, and enables the guide means to be formed in a simple manner as a pair of annular guide rings located in the said circumferential recesses to close the open ends of said transverse grooves or slots in the rotor.
  • the said guide rings are held in place in said circumferential recesses by means of axially extending clamping bolts arranged to extend through bores in the said rotor at positions between the said radial cylinders.
  • the said pistons are preferably provided with diametrically opposed, recessed faces on their sides adjacent the axial ends of said rollers.
  • An effective seal between the piston and the walls of its corresponding radial cylinder may be maintained by providing a sealing ring adjacent the inner end of the piston, at a point spaced from the recessed faces of the piston.
  • a motor in accordance with one embodiment of the invention comprises a rotor 1, mounted for rotation within an outer casing 2 by means of bearings 3.
  • the rotor 1 comprises a plurality of radial cylindrical recesses 4, within each of which is located a corresponding piston 5.
  • Each piston 5 has a peripheral piston ring 6 in sealing engagement with the wall of the cylinder 4.
  • the outer casing 2 incorporates a peripheral cam track 7, the annular profile of which is shown in Figure 2.
  • Each of the pistons 5 contains a cam follower roller 8 which is held captive within a part cylindrical recess 5A of the piston, the recess 5A extending over an arc of a cylinder which subtends slightly more than 180 0 , such that the roller 8 is retained against outward displacement from the piston 5.
  • the cam followers 8 are relatively rotatable within the recesses 5A, which may be lined with an anti-frictional material such as an appropriate synthetic plastics material.
  • the pistons 5 are spring loaded in an outward direction by means of cylindrical compression springs 9 held in locating bores 1A and 5B of the rotor and piston respectively, such that in the idle condition and in the absence of hydraulic forces acting in the cylinders 4, the rollers 8 are held lightly in engagement with the periphery of the cam track 7.
  • the cam follower rollers 8 are located with their rotary axes in alignment with the rotary axis of the rotor 1, by means of guide rings 10 which are located in corresponding circumferential recesses 1B in the axial ends of that portion of the rotor 1 containing the cylinders 4, the cylindrical walls of the cylinders 4 also having transverse slots 4A to receive the axial ends of the cam follower rollers 8, which are of substantially the same axial length as the pistons 5.
  • the guide rings 10 are located in position by means of securing bolts 11 passing through apertures 1C in the central portion of the rotor 1 between the cylinders 4, as can be seen more clearly by reference to Figures 2 and 3.
  • the distance between the guide rings 10 corresponds substantially to the diameter of the cylinders 4, and the portions of the pistons 5 adjacent the axial ends of the rotor 1 are recessed as shown at 5C, in order to provide a clearance between the pistons 5 and the guide rings 10.
  • the motor casing 2 is provided with hydraulic supply and return conduits 12 and 13, which communicate with annular channels 14 and 15 defined between the motor casing 2 and an annular valve insert 16.
  • the valve insert 16 is axially slidable within the motor casing 2, being spring urged to the left, as viewed in Figure 1, by means of a series of compression springs 17 located within bores 16A of the valve insert.
  • the springs 17 maintain the position of the valve insert 16 during start up or reversal of the motor until the hydraulic pressure loading on the stepped portions of the valve insert is established.
  • the valve insert is held against rotation within the valve casing by means of a peg 18.
  • the conduits 20, 21 and the ports 20A and 21A are arranged in alternation around the circumference of the valve insert 16, as shown more clearly in Figure 3.
  • each piston 15 is alternately driven outwardly towards the cam track 7 by hydraulic fluid supplied under pressure through the conduit 20, and returned towards the rotor axis by the cam track 7 to discharge hydraulic fluid through the exhaust conduits 21. It will be appreciated that by reversing the supply of hydraulic fluid to the ports 12 and 13, the direction of rotation of the hydraulic motor may be reversed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydraulic Motors (AREA)
EP81303879A 1980-08-26 1981-08-25 Moteur hydraulique Withdrawn EP0046691A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8027617A GB2086991A (en) 1980-08-26 1980-08-26 Improvements in and relating to hydraulic motors
GB8027617 1980-08-26

Publications (2)

Publication Number Publication Date
EP0046691A2 true EP0046691A2 (fr) 1982-03-03
EP0046691A3 EP0046691A3 (fr) 1982-03-31

Family

ID=10515655

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81303879A Withdrawn EP0046691A3 (fr) 1980-08-26 1981-08-25 Moteur hydraulique

Country Status (3)

Country Link
EP (1) EP0046691A3 (fr)
JP (1) JPS57119173A (fr)
GB (1) GB2086991A (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2586752A1 (fr) * 1985-09-05 1987-03-06 Rexroth Mannesmann Gmbh Machine a pistons radiaux, a tensions de contact reduites
FR2651836A1 (fr) * 1989-09-14 1991-03-15 Poclain Hydraulics Sa Mecanisme, moteur ou pompe, a pistons supportant des rouleaux d'appui desdits pistons sur une came.
FR2658869A1 (fr) * 1990-02-16 1991-08-30 Rexroth Mannesmann Gmbh Machine a pistons radiaux et son procede de fabrication.
EP0931932A3 (fr) * 1993-04-21 1999-09-22 ZF FRIEDRICHSHAFEN Aktiengesellschaft Entraínement hydrostatique-mécanique pour un malaxeur à béton
WO1999046504A3 (fr) * 1998-03-10 1999-12-09 Mannesmann Rexroth Ag Moteur a pistons radiaux avec guidage des galets
WO2000005502A1 (fr) * 1998-07-21 2000-02-03 Mannesmann Rexroth Ag Moteur a pistons radiaux avec elements de guidage de galets
EP1785622A1 (fr) * 2005-11-15 2007-05-16 Weber-Hydraulik GmbH Pompe hydraulique
FR3010744A1 (fr) * 2013-09-16 2015-03-20 Poclain Hydraulics Ind Bloc cylindres ameliore pour machine hydraulique presentant un encombrement radial optimise
WO2018090159A1 (fr) * 2016-11-18 2018-05-24 秦皇岛正时乐液压设备有限公司 Moteur hydraulique à couple élevé à faible vitesse à courbure interne, avec sortie de couple par rotation de boîtier
CN108301964A (zh) * 2018-04-04 2018-07-20 上海波赫驱动系统有限公司 一种内曲线径向柱塞液压马达转子总成
CN110242353A (zh) * 2019-07-17 2019-09-17 顾新钿 一种气动马达
FR3136519A1 (fr) * 2022-06-13 2023-12-15 Poclain Hydraulics Industrie Machine hydraulique à débit amélioré

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE456517B (sv) * 1982-09-08 1988-10-10 Hegglund & Soner Ab Hydraulisk radialkolvmotor
FI73789C (fi) * 1983-12-07 1987-11-09 Partek Ab Hydraulisk motor.
JPH0776077B2 (ja) * 1992-10-21 1995-08-16 株式会社川崎機械製作所 ワイヤロープの巻取り巻出し駆動用油圧モータ及び駆動方法
CN102493913B (zh) * 2011-12-13 2015-05-13 宁波德辰液压科技有限公司 壳转式内曲线径向柱塞液压马达
KR101811422B1 (ko) * 2016-10-20 2017-12-21 박영선 유체 모터

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB164180A (en) * 1920-03-24 1921-06-09 Harry Ralph Ricardo Improvements in or relating to rotary pumps or compressors
GB187227A (en) * 1921-10-12 1923-12-27 Wladimir De Wasmundt Improvements in tangential cylinder engines
GB1220146A (en) * 1968-07-19 1971-01-20 Davy & United Eng Co Ltd Hydraulic motor
FR2196674A5 (fr) * 1972-08-16 1974-03-15 Newage Engineers Ltd
DE2332580A1 (de) * 1973-06-27 1975-01-02 Wepuko Hydraulik Gmbh Innenbeaufschlagte radialkolbenpumpe
GB1391592A (en) * 1971-05-19 1975-04-23 Contractors Plant London Midla Fluidpressure eg hydraulic motors
FR2368619A1 (fr) * 1976-10-21 1978-05-19 Automotive Prod Co Ltd Ensemble contre-came-piston pour machine hydrostatique

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB164180A (en) * 1920-03-24 1921-06-09 Harry Ralph Ricardo Improvements in or relating to rotary pumps or compressors
GB187227A (en) * 1921-10-12 1923-12-27 Wladimir De Wasmundt Improvements in tangential cylinder engines
GB1220146A (en) * 1968-07-19 1971-01-20 Davy & United Eng Co Ltd Hydraulic motor
GB1391592A (en) * 1971-05-19 1975-04-23 Contractors Plant London Midla Fluidpressure eg hydraulic motors
FR2196674A5 (fr) * 1972-08-16 1974-03-15 Newage Engineers Ltd
DE2332580A1 (de) * 1973-06-27 1975-01-02 Wepuko Hydraulik Gmbh Innenbeaufschlagte radialkolbenpumpe
FR2368619A1 (fr) * 1976-10-21 1978-05-19 Automotive Prod Co Ltd Ensemble contre-came-piston pour machine hydrostatique

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2180011A (en) * 1985-09-05 1987-03-18 Rexroth Mannesmann Gmbh Radial piston engine
FR2586752A1 (fr) * 1985-09-05 1987-03-06 Rexroth Mannesmann Gmbh Machine a pistons radiaux, a tensions de contact reduites
FR2651836A1 (fr) * 1989-09-14 1991-03-15 Poclain Hydraulics Sa Mecanisme, moteur ou pompe, a pistons supportant des rouleaux d'appui desdits pistons sur une came.
US5081906A (en) * 1989-09-14 1992-01-21 Poclain Hydraulics Mechanism, motor pump, incorporating pistons supporting, rollers for abutment of said pistons on a cam
FR2658869A1 (fr) * 1990-02-16 1991-08-30 Rexroth Mannesmann Gmbh Machine a pistons radiaux et son procede de fabrication.
GB2241749A (en) * 1990-02-16 1991-09-11 Rexroth Mannesmann Gmbh Radial piston engine
US5179889A (en) * 1990-02-16 1993-01-19 Mannesmann Rexroth Gmbh Radial piston engine
GB2241749B (en) * 1990-02-16 1994-11-16 Rexroth Mannesmann Gmbh Radial piston engine
EP0931932A3 (fr) * 1993-04-21 1999-09-22 ZF FRIEDRICHSHAFEN Aktiengesellschaft Entraínement hydrostatique-mécanique pour un malaxeur à béton
US6494127B1 (en) 1998-03-10 2002-12-17 Mannesmann Rexroth Ag Radial piston engine with guide rollers
WO1999046504A3 (fr) * 1998-03-10 1999-12-09 Mannesmann Rexroth Ag Moteur a pistons radiaux avec guidage des galets
WO2000005502A1 (fr) * 1998-07-21 2000-02-03 Mannesmann Rexroth Ag Moteur a pistons radiaux avec elements de guidage de galets
US6443047B1 (en) 1998-07-21 2002-09-03 Bosch Rexroth Ag Radial piston engine with roller guides
EP1785622A1 (fr) * 2005-11-15 2007-05-16 Weber-Hydraulik GmbH Pompe hydraulique
FR3010744A1 (fr) * 2013-09-16 2015-03-20 Poclain Hydraulics Ind Bloc cylindres ameliore pour machine hydraulique presentant un encombrement radial optimise
WO2018090159A1 (fr) * 2016-11-18 2018-05-24 秦皇岛正时乐液压设备有限公司 Moteur hydraulique à couple élevé à faible vitesse à courbure interne, avec sortie de couple par rotation de boîtier
CN108301964A (zh) * 2018-04-04 2018-07-20 上海波赫驱动系统有限公司 一种内曲线径向柱塞液压马达转子总成
CN110242353A (zh) * 2019-07-17 2019-09-17 顾新钿 一种气动马达
CN110242353B (zh) * 2019-07-17 2024-03-15 顾新钿 一种气动马达
FR3136519A1 (fr) * 2022-06-13 2023-12-15 Poclain Hydraulics Industrie Machine hydraulique à débit amélioré
WO2023242502A1 (fr) * 2022-06-13 2023-12-21 Poclain Hydraulics Industrie Machine hydraulique a debit ameliore

Also Published As

Publication number Publication date
GB2086991A (en) 1982-05-19
JPS57119173A (en) 1982-07-24
EP0046691A3 (fr) 1982-03-31

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Inventor name: CHAPPLE, PETER JOHN