US3587401A - Hydraulic radial motor - Google Patents

Hydraulic radial motor Download PDF

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Publication number
US3587401A
US3587401A US803759A US3587401DA US3587401A US 3587401 A US3587401 A US 3587401A US 803759 A US803759 A US 803759A US 3587401D A US3587401D A US 3587401DA US 3587401 A US3587401 A US 3587401A
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United States
Prior art keywords
pistons
motor
cam
cylinder block
orifices
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
Application number
US803759A
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English (en)
Inventor
Fritz Agne Johansson
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Individual
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Individual
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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
    • F03C1/0403—Details, component parts specially adapted of such engines
    • F03C1/0428—Supporting and guiding means for the pistons
    • 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
    • F03C1/0435—Particularities relating to the distribution members
    • F03C1/0438—Particularities relating to the distribution members to cylindrical distribution members
    • 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
    • F03C1/047—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement the pistons co-operating with an actuated element at the outer ends of the cylinders

Definitions

  • the present invention relates to an hydraulic motor having a number of pistons arranged for radial motion in a cylinder block which preferably forms the stationary part of the motor.
  • the pistons are, over piston rods extending outwardly of the pistons, connected to cam rollers arranged for cooperation with at least one circumferentially closed cam curve radially surrounding said cam rollers.
  • the cam curve is rigidly connected to the motor casing and rotatable relatively the cylinder block.
  • the number of cams on the cam curve is different from the number of pistons.
  • the pistons are arranged upon supply of a pressure fluid to working chambers located radially inside the pistons to cause the cam curve and thereby also the motor casing to rotate relatively the cylinder block.
  • the main object of the invention is to offer a solution of the problem of providing a double-acting hydraulic motor of the type above described which is of a simple and robust construction.
  • Another object of the invention is to provide a double-acting hydraulic motor which can be manufactured at lower costs than a single-acting motor having the same output power.
  • a further object of the invention is to provide a double-acting hydraulic motor of the kind described which is very reliable in operation.
  • the cam rollers above referred to are arranged to cooperate also with at least one circumferentially closed cam curve located radially inside said rollers and, like the outer cam curve, rigidly connected to the motor casing, said inner cam curve being actuated by the cam rollers when pressure fluid is supplied to working chambers located outwardly of the pistons, valve means being actuated by the cam rollers when pressure fluid is supplied to working chambers located outwardly of the pistons, valve means being provided to supply alternately the outer and the inner working chamber of each piston cylinder with pressure fluid and simultaneously to discharge the op posite working chamber.
  • an hydraulic motor designed as above described does very well meet the requirements on reliable operation and reasonable manufacturing costs. However, it also has the additional advantage of being more compact than a single-acting motor having the same output power. This is true in respect of radial as well as axial dimensions.
  • Another advantage of an hydraulic motor designed in accordance with the invention is that due to the positive control of the piston movements, obtained by arranging the cam rollers in circumferential grooves defined by the outer and inner cam curves, it is possible to omit the pressure springs which in single-acting motors must be mounted in the working chamber of each piston to make sure that the cam rollers are constantly maintained in contact with the cam curve.
  • a still further advantage is that the axial width of the cam curves can be reduced to half the width required in a corresponding single-acting motor. This reduction is made possible by the decrease in specific pressure exerted by the cam rollers on the cam curves obtained through the invention.
  • the distribution valve serving to control the flow of pressure fluid to and from the working chambers of the motor may preferably comprise a valve member mounted concentrically in the cylinder block for rotation in unison with the motor casing.
  • this valve member has the shape of a tube section having a number of orifices in the tube wall which are adapted to cooperate with cylinder block channels communicating with the individual working chambers.
  • the distribution valve contains two mutually separated chambers radially defined by said tube wall, one of said chambers being in constant communication with the pressure fluid inlet of the motor and the other with the pressure fluid outlet.
  • the orifices in the wall of the tubular valve member may be divided into two groups,
  • each group namely one group communicating with the outer working chambers and one group for communication with the inner working chambers, each group comprising two series of orifices, within each series equally spaced in the circumferential direction of a circle, the one series communicating with the inlet chamber of the valve and the other with the outlet chamber, the number of orifices within each series being equal to the number of cams on each cam curve.
  • the channels or bores in the cylinder block can suitably be disposed in one axial row for each piston, the two groups of orifices in the wall of the tubular valve member being mutually displaced by an angle corresponding to half the angular distance between two adjacent orifices in one series.
  • a motor designed in accordance with the present invention has the substantial characteristic of being reversible so that switching from the one direction of rotation to the other can be effected simply by interchanging the inlet and outlet pressure fluid connections. It should also be emphasized] that while in most practical applications it is preferred to have the motor casing and the cam curves forming the rotor and the cylinder block the stationary part of the motor it is equally possible to mount the casing stationary in which case the cylinder block serves as the rotor.
  • FIG. 1 is a partly sectional perspective view showing, by way of example, an hydraulic motor in accordance with one embodiment of the invention
  • FIG. 2 shows a section through the motor of FIG. 1 taken along a radial plane
  • FIG. 3 and 4 are sections taken along the lines Ill-Ill and lV-IV in FIG. 2, respectively;
  • FIG. 5 is a perspective view diagrammatically illustrating a valve device forming part of the motor shown in FIG. 1 and serving to control the inlet and outlet flow of pressure fluid to the working chambers thereof;
  • FIG. 6 is an exploded perspective view showing the valve of FIG. 5 in greater detail.
  • the motor shown in the drawings is a radial hydraulic motor having nine cylinders with a motor casing 1 serving as a rotor and a cylinder block 2 concentrically located in the casing and forming the stationary part of the motor.
  • the casing I consists of a cylindrical mantle 3 and two end walls 4. Adjacent each front wall 4 there is provided an inner cam curve 5 as well as an outer cam curve 6 both rigidly secured to the motor casing 1 for rotation therewith.
  • the cam curves 5 and 6 have undulated cam surfaces 7 and 8 facing each other and defining between them circumferentially closed grooves the perephery of which corresponds to eight wave lengths. Stated in other words, each cam curve 5 and 6 comprises eight cams.
  • the cylinder block 2 serving as the stationary part of the motor is formed by a cylindrical body of circular cross section having nine radial bores forming nine cylinders 9 each containing a piston 10.
  • the pistons 10 have outwardly extending piston rods 11 passing through cylinder plugs 12 at the outer ends of the cylinders 9.
  • each piston rod 11 is connected to an axially oriented yoke 13 carrying at each end thereof a cam roller 14 in the shape of roller bearing.
  • Said cam rollers 14 are mounted with an insignificant clearance in the grooves formed between cam curves 7 and 8.
  • Valve member 16 Arranged concentrically in the cylinder block 2 is a distribution valve, generally designated 15 and comprising a tubular valve member 16 which by pins 17 is secured to one end wall 4 of the motor casing 1.
  • Valve member 16 has a number of orifices 34 for cooperation with channels or passages l8, 19 20 and 21 in the cylinder block 2 through which passages the hydraulic pressure fluid can flow to and from the working chambers at opposite sides of each piston 10.
  • Passages l8 and 19 serve as inlet and outlet conduits, respectively, for the inner working chambers, whereas passages 20 and 21 form inlet and outlet connections, respectively, for the outer working chambers.
  • a solid cylindrical body 22 of circular cross section Disposed inside the tubular valve member 16 there is a solid cylindrical body 22 of circular cross section having a central flange 23 and two end flanges 24.
  • Body 22 is by a force fit maintained in its proper position in valve member 16. As a matter of principle it is, however, insignificant whether or not body 22 is rotatable relatively the valve member 16.
  • the central flange 23 divides the space between member 16 and body 22 into two annular chambers 25 and 26 which are restricted in axial direction by end flanges 24. Chamber 25 forms an inlet chamber and chamber 26 an outlet chamber.
  • Pressure fluid is fed to chamber 25 through a number of radial orifices 27 in valve member 16 which orifices through a circumferential groove 28 in the outer cylindrical surface of member 16 communicate with a supply passage 29 bored in cylinder block 2 and an extension 30 which projects axially to the right as shown in H0. 1 and has a reduced cross section.
  • Said extension 30 is intended to be mounted in a motor frame not shown.
  • valve member 16 adapted to cooperate with the passages 18 to 21 in cylinder block 2 are arranged in four series two of which communicate with the inlet chamber 25 and the r maining two with the outlet chamber 26.
  • said orifices 34 are uniformly spaced in angular direction and located along a common circle. The angular spacing of orifices 34 within each series corresponds to the angular spacing of the cams on each cam curve and 6, respectively.
  • valve member 16 and the passages 18 to 21 in cylinder block 2 are arranged so as to cause the inner and outer working chambers within each cylinder 9 to commu nicate alternately with the inlet chamber 25 and the outlet chamber 26 of valve 15.
  • Two plates 35 having radially oriented recesses 36 are arranged to guide the movement of the yokes 13 carrying the cam rollers 14. Said plates 35 serve to protect piston rods 11 and pistons from being affected by any forces not radially directed.
  • a hydraulic radial piston motor comprising a cylinder block and a motor casing supported for rotation relative to said cylinder block, a plurality of pistons supported for radial movement by said cylinder block, said pistons being connected by piston rods to cam rollers, a first circumferentially closed cam means secured to said casing, said first cam means surrounding and engaging said rollers and being radially aligned therewith, said first cam means including a plurality of cam portions of a number different from the number of pistons, means for supplying fluid pressure to said pistons to urge the pistons outwardly and impart by means of said rollers rotary movement of said first cam means and said casing relative to said cylinder block, a second circumferentially closed cam means secured to said casing, said second cam means being radially aligned with and disposed inwardly of an engaging said rollers, means for supplying fluid pressure to said pistons to urge the pistons inwardly and impart by means of said rollers rotary movement of said second cam means and said casing relative to said said cylinder
  • a hydraulic motor as claimed in claim 2 wherein the passages formed in said cylinder block for each particular piston are disposed in an axially aligned row, the two groups of orifices in the cylindrical wall of the valve member being angularly displaced by an amount corresponding to half the angular spacing between two adjacent orifices in one series of said orifices.

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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)
US803759A 1968-03-07 1969-03-03 Hydraulic radial motor Expired - Lifetime US3587401A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE03039/68A SE332399B (no) 1968-03-07 1968-03-07

Publications (1)

Publication Number Publication Date
US3587401A true US3587401A (en) 1971-06-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
US803759A Expired - Lifetime US3587401A (en) 1968-03-07 1969-03-03 Hydraulic radial motor

Country Status (8)

Country Link
US (1) US3587401A (no)
AT (1) AT295951B (no)
CH (1) CH487331A (no)
DE (1) DE1911747A1 (no)
FR (1) FR2003388A1 (no)
GB (1) GB1250231A (no)
NL (1) NL6903532A (no)
SE (1) SE332399B (no)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786727A (en) * 1971-09-23 1974-01-22 A Baumann Expansible chamber device
US4136602A (en) * 1976-05-24 1979-01-30 Lenz Leonard L Hydraulic motor
US4505185A (en) * 1981-03-20 1985-03-19 Power-Train, Inc. Through-shaft energy converter transmission
ITFO20090003A1 (it) * 2009-02-10 2009-05-12 Antonio Agnoletti Motore idrostatico con rotore a partatie mobili azionato da liquidi compressi
EP2436918A1 (de) * 2010-09-29 2012-04-04 Salzgitter Maschinenbau AG, Hydraulischer Radialkolbenmotor
CN103114963A (zh) * 2013-01-04 2013-05-22 湖州师范学院 一种低速大扭矩液压马达
US20130233259A1 (en) * 2010-09-23 2013-09-12 Michael W. Courson Rotary cam radial steam engine
WO2015076716A1 (en) * 2013-11-25 2015-05-28 Thordab Ab Pump/motor
US20160265518A1 (en) * 2015-03-09 2016-09-15 Rabhi Vianney System for coupling a piston for a hydraulic pump motor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE316569B (no) * 1969-02-14 1969-10-27 Dental Ab
US3710691A (en) * 1970-07-31 1973-01-16 J Sullivan Reciprocating piston engine
DE8906197U1 (de) * 1989-05-19 1989-07-20 Wigha, Elektronische Meßtechnik GmbH, 8057 Eching Vorrichtung zum Messen oder Messen und Regeln eines Gasmassenflusses
DE102010053977A1 (de) * 2010-12-09 2012-06-14 Rheinisch-Westfälische Technische Hochschule Aachen Steuerwelle eines pneumatischen Verdrängeraggregates

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786727A (en) * 1971-09-23 1974-01-22 A Baumann Expansible chamber device
US4136602A (en) * 1976-05-24 1979-01-30 Lenz Leonard L Hydraulic motor
US4505185A (en) * 1981-03-20 1985-03-19 Power-Train, Inc. Through-shaft energy converter transmission
ITFO20090003A1 (it) * 2009-02-10 2009-05-12 Antonio Agnoletti Motore idrostatico con rotore a partatie mobili azionato da liquidi compressi
US20130233259A1 (en) * 2010-09-23 2013-09-12 Michael W. Courson Rotary cam radial steam engine
US9453411B2 (en) * 2010-09-23 2016-09-27 Michael W. Courson Rotary cam radial steam engine
US20170030193A1 (en) * 2010-09-23 2017-02-02 Michael W. Courson Rotary Cam Radial Steam Engine
EP2436918A1 (de) * 2010-09-29 2012-04-04 Salzgitter Maschinenbau AG, Hydraulischer Radialkolbenmotor
CN103114963A (zh) * 2013-01-04 2013-05-22 湖州师范学院 一种低速大扭矩液压马达
WO2015076716A1 (en) * 2013-11-25 2015-05-28 Thordab Ab Pump/motor
US20160265518A1 (en) * 2015-03-09 2016-09-15 Rabhi Vianney System for coupling a piston for a hydraulic pump motor

Also Published As

Publication number Publication date
NL6903532A (no) 1969-09-09
GB1250231A (no) 1971-10-20
FR2003388A1 (no) 1969-11-07
AT295951B (de) 1972-01-25
SE332399B (no) 1971-02-01
DE1911747A1 (de) 1969-10-30
CH487331A (de) 1970-03-15

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