US3610106A - Radial variable displacement hydraulic motor of the slow type - Google Patents

Radial variable displacement hydraulic motor of the slow type Download PDF

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Publication number
US3610106A
US3610106A US817733A US3610106DA US3610106A US 3610106 A US3610106 A US 3610106A US 817733 A US817733 A US 817733A US 3610106D A US3610106D A US 3610106DA US 3610106 A US3610106 A US 3610106A
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eccentric
duct
hydraulic motor
eccentricity
elements
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Expired - Lifetime
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US817733A
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English (en)
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Riccardo Cavalieri
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03CPOSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00Reciprocating-piston liquid engines
    • F03C1/02Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/04Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/0447Controlling
    • F03C1/0457Controlling by changing the effective piston stroke
    • F03C1/046Controlling by changing the effective piston stroke by changing the excentricity of one element relative to another element

Definitions

  • the present invention relates to a hydraulic radial motor of the slow type, the displacement of which is variable, and more specifically this invention relates to a device for changing the effective displacement of a motor of this type, operating through the reduction of the strokes of the pistons within the cylinders, by means of the change of the eccentricity of the eccentric controlling the connecting rods of said pistons.
  • the slow hydraulic motors i.e. those motors which are capable of being directly coupled to the driving wheels, with the interposition of no train of reduction gears, are the fixed displacement, radial type motors.
  • the main purpose of the present invention is that of providing a slow radial hydraulic motor, with a single radially disposed series or plural radially disposed series of cylinders, including means for changing its displacement, so as to render the motor capable of being adapted to the various operative exigencies which will occur during its operation.
  • the purpose of the present invention is that of providing means for changing the effective displacement, in the radial hydraulic motors, including means for changing the total eccentricity of an eccentric element coupled to the pistons of the radial motor in compliance with the displacement as required during the particular stages of operation.
  • the change of the eccentricity of the eccentric controlling the pistons is obtained by changing the mutual position of mounting of two eccentric elements coaxially located the one within the other, so as to effect a total eccentricity resulting from the vectorial sum of the single vectors representing the eccentricities of said two eccentrics.
  • the relative rotation of the two eccentric coaxial elements will be obtained, according to this invention, by means of an annular cylinder formed by a toroidal groove provided either on one of the coaxial elements or on both elements.
  • a first contrast element and a second contrast element each rigid with one of the two coaxial parts, form the piston and the bottom of cylinder itself, respectively.
  • said two coaxial eccentric elements are held rigid by means of a device which can allow the elements to be locked at any mutual angular position, allowing thus an almost continuous variation of the total eccentricity to be obtained.
  • the locking element as above referred to, consists of an annular element slidable in a space defined between the opposed surfaces of the outer eccentric and of the inner eccentric with a double, inner and outer set of splines so arranged that the outer splines will engaged corresponding splines provided inside the outer eccentric element, and the inner splines will engage similar splines provided on the outer surface of the inner eccentric element.
  • the teeth are preferably beveled in correspondence with the associated ends.
  • the operation of change of the displacement i.e. of change of the total eccentricity of the eccentric element controlling the pistons, consists of an operation of change of the orientation or relative position of mounting of the two eccentric coaxial elements. and is carried out by means of a control device ensuring the sequence of the operations in the required order, and rendering impossible the start of a subsequent stage until the preceding stage has been completed.
  • the arrangement according to the present invention will be described with reference to an embodiment particularly suitable for obtaining two predetermined values of total eccentricity, resulting from the vectorial sum and the difference, respectively, of the eccentricities of the two eccentric coaxial elements (maximum displacement and minimum displacement, respectively).
  • the two eccentricity values can be taken at will, provided that they are comprised between the maximum value and the minimum value as previously specified, by effecting mutual rotation through different angular values.
  • FIG. 1 shows a diagrammatical cross sectional view of a radial hydraulic motor, according to this invention
  • FIG. 2 shows a cross sectional view taken along the planes 22 of FIG. 1;
  • FIG. 3a, 3b, 30 show the respective positions which can be taken by the eccentric elements controlling the pistons of the radial motor in the conditions corresponding to the maximum, minimum and intermediate displacements (eccentricities);
  • FIG. 4 shows a cross sectional view of the eccentric unit controlling the pistons
  • FIG. 5 shows a cross sectional view taken along the plane 5-5 of FIG. 4;
  • FIG. 6 shows a cross sectional view taken along the plane 6-6 of FIG. 4;
  • FIG. 7 shows a cross sectional view taken along the plane 77 of FIG. 4;
  • FIG. 8 shows a longitudinal sectional view of the annular coupling element for the eccentrics controlling the pistons
  • FIGS. 9a and 9b show the detail A of FIG. 4 on an en larged scale
  • FIG. 10 shows the detail B of FIG. 5 on an enlarged scale
  • FIG. 11 shows the detail C of FIG. 6 on an enlarged scale
  • FIG. 12 shows the detail of the structure of an auxiliary element of the hydraulic control for changing the eccentricity, corresponding to the detail D of FIG. 4.
  • the radial hydraulic motor to which the control arrangement for changing the displacement according to this invention can be applied includes a frame I, whereon are located the cylinders 2 within which slide the pistons 3 connected by means of the piston rods 4 to an eccentric unit associated to the driving shaft 6.
  • the eccentric unit 5 includes a first eccentric 7 rigid with the driving shaft 6 and a second eccentric 8 coaxially mounted on the first eccentric in a semi-fixed way, as will be disclosed later on.
  • the reference a denotes the axis of rotation or center of the driving shaft 6
  • b is the center of symmetry of the first eccentric 7 rigid with the driving shaft 6
  • c is the center of symmetry of the second eccentric 8 rotatably mounted on the first eccentric 7.
  • a duct 9 is embodied, defined on one side by a bushing 10 screwed on the body of the eccentric 7 and outwardly closed by the internal cylindrical periphery of the movable eccentric element 8.
  • a duct 9 is embodied, defined on one side by a bushing 10 screwed on the body of the eccentric 7 and outwardly closed by the internal cylindrical periphery of the movable eccentric element 8.
  • two splined crowns 11, 12 are embodied and so arranged as to be able to engage a driving ring 13 rigid with an annular piston 14 slidable in said peripheral duct 9'.
  • the part 9 of the peripheral duct 9 is connected to a duct 15 provided in the eccentric external element 8 which connects at 16 with a branch 17 of the duct 18 provided inside the inner eccentric element 7 and driving shaft 6.
  • the duct 18 through another branch 19 can communicate with the chamber 20 forming an annular cylinder for controlling and allowing the mutual rotation of the eccentric elements 7, 8.
  • the part 9 of the peripheral duct faced towards the annular piston is connected through a duct 21 to a valve 22 unidirectionally limiting the fluid flow as will be hereinafter described.
  • the duct 21 is connected at 23 to a branch 24 of the duct 25.
  • Another branch 26 of the duct leads to another part, opposite to the preceding one, of the chamber 20 forming the aforesaid annular cylinder.
  • the chamber 20 is subdivided into two contiguous parts by the contrast elements 27, 28 rigid with the outer eccentric 8 and the inner eccentric 7, respectively.
  • the valve 22 for the one way restriction of the flow of the hydraulic fluid includes a cylindrical-conical seat within which a conical body is contained, provided with a gauged longitudinal passage 31, restricting the fluid flow when it is directed in the direction of the arrow F, and the element 30 is leftwards pushed; and with passages 32 for the unobstructed passage of the fluid when the flow is directed in a direction contrary to that of the arrow F, and the element 30 bears against the bottom of the seat 29.
  • This o eration will be effected by delivering pressurized hydraulic fluid to the duct 18 and connecting the duct 25 to exhaust.
  • the hydraulic fluid delivered to the duct 18 initially will be unable to effect the displacement of the contrast elements 27, 28 as said displacement will be impeded by the engagement existing between the eccentric elements 7, 8 comprised by the locking ring 13.
  • the hydraulic fluid delivered to the duct 18 reaches through the branch 17 the space 9 at the right hand side of the annular element 13, and as the chamber 9 is connected to exhaust through the branch 21 and the duct 25, the annular piston 14 will drive leftwards the annular element 13 disengaging the teeth 11, 12 from the eccentric elements 7, 8, respectively, causing the unlocking thereof.
  • the second stage will automatically start, i.e. the stage corresponding to the mutual displacement of the two eccentric coaxial elements 7, 8 so as to increase the total eccentricity.
  • a hydraulic motor having a drive shaft, a plurality of cylinder and piston assemblies radially disposed in a series about the drive shaft, a pair of inner and outer eccentrics interconnecting the drive shaft and the pistons, said inner eccentric being rotatable with the drive shaft and said outer eccentric encompassing said inner eccentric, and means for selectively locking the two eccentrics together in a first position relative to each other and for unlocking and rotating the eccentrics relative to each other to a second position and for relocking the eccentrics together in said second position, the last-named means comprising external splines on said inner eccentric and internal splines on the said outer eccentric and means selectively engageable between the splines on said eccentrics to lock the eccentrics in adjusted position relative to each other.
  • a hydraulic motor as claimed in claim 1 and means for selectively moving said engageable means parallel to the axis of the drive shaft thereby selectively to engage and disengage said engageable means.
  • a hydraulic motor as claimed in claim 2 said moving means comprising an annular piston disposed in an annular chamber between said eccentrics, and means for selectively applying hydraulic fluid pressure to opposite sides of said piston.
  • said means for applying fluid pressure comprising a first passageway for hydraulic fluid and means responsive to the application of hydraulic fluid under pressure in said first passageway to disengage said engageable means and to rotate said eccentrics relative to each other in one direction and to reengage said engageable means, and a second passageway for hydraulic fluid and means responsive to the application of hydraulic fluid under pressure in said second passageway to disengage said engageable means and to rotate said eccentrics relative to each other in the opposite direction and to reengage said engageable means.
  • a hydraulic motor as claimed in claim. 4 said passageways having portions extending through said drive shaft and then outwardly through said inner eccentric and registering with portions of said passageways in said outer eccentric.
  • a fluid motor as claimed in claim 8 said restricting means comprising valve means permitting a higher fluid flow rate in one direction than in the other opposite direction.
  • said first passageway comprising a first U-shaped portion in said outer eccentric having open ends extending toward said inner eccentric, the end of said U-shaped portion remote from the portion of said first passageway in said inner eccentric communicating with said chamber at one side of said annular piston, said second passageway having a U-shaped portion in said outer eccentric having its end remote from said first eccentric communicating with said chamber at the other side of said annular piston, said portions of said passageways in said inner eccentric also communicating with opposite ends of a partial annular chamber in said inner eccentric whose ends are separated by a projection on said outer eccentric.

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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)
US817733A 1968-04-30 1969-04-21 Radial variable displacement hydraulic motor of the slow type Expired - Lifetime US3610106A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT3666068 1968-04-30
IT3824668 1968-07-06
IT4215268 1968-12-21

Publications (1)

Publication Number Publication Date
US3610106A true US3610106A (en) 1971-10-05

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US817733A Expired - Lifetime US3610106A (en) 1968-04-30 1969-04-21 Radial variable displacement hydraulic motor of the slow type

Country Status (5)

Country Link
US (1) US3610106A (fr)
JP (1) JPS4812019B1 (fr)
DE (1) DE1921976A1 (fr)
FR (1) FR2007300A1 (fr)
GB (1) GB1272083A (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4004498A (en) * 1974-02-12 1977-01-25 Nissei Plastics Industrial Co., Ltd. Hydraulic motor
US5012724A (en) * 1988-05-19 1991-05-07 Bruno Giamello Radial piston hydraulic motor of variable cylinder capacity
US5136932A (en) * 1988-05-19 1992-08-11 Bruno Giamello Radial piston hydraulic motor of variable cylinder capacity
US5634777A (en) * 1990-06-29 1997-06-03 Albertin; Marc S. Radial piston fluid machine and/or adjustable rotor
US20070151443A1 (en) * 2003-12-15 2007-07-05 Garth Davey Hydraulic motor/pump
WO2010138509A1 (fr) * 2009-05-26 2010-12-02 Husco International, Inc. Machine hydraulique compacte à piston radial excentré
US8869521B2 (en) 2009-04-02 2014-10-28 Husco International, Inc. Fluid working machine with cylinders coupled to split exterior ports by electrohydraulic valves
EP3048301A1 (fr) * 2015-01-20 2016-07-27 Eaton Corporation Dispositif hydraulique à pistons radiaux avec mécanisme de transition de pression amélioré
CN113530784A (zh) * 2021-07-21 2021-10-22 余世亮 一种新型变量径向柱塞泵

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4004498A (en) * 1974-02-12 1977-01-25 Nissei Plastics Industrial Co., Ltd. Hydraulic motor
US5012724A (en) * 1988-05-19 1991-05-07 Bruno Giamello Radial piston hydraulic motor of variable cylinder capacity
US5133244A (en) * 1988-05-19 1992-07-28 Bruno Giamello Radial piston hydraulic motor of variable cylinder capacity
US5136932A (en) * 1988-05-19 1992-08-11 Bruno Giamello Radial piston hydraulic motor of variable cylinder capacity
US5634777A (en) * 1990-06-29 1997-06-03 Albertin; Marc S. Radial piston fluid machine and/or adjustable rotor
US7637202B2 (en) * 2003-12-15 2009-12-29 Hydrostatic Design Technology Pty Ltd Hydraulic motor/pump
US20070151443A1 (en) * 2003-12-15 2007-07-05 Garth Davey Hydraulic motor/pump
US8869521B2 (en) 2009-04-02 2014-10-28 Husco International, Inc. Fluid working machine with cylinders coupled to split exterior ports by electrohydraulic valves
WO2010138509A1 (fr) * 2009-05-26 2010-12-02 Husco International, Inc. Machine hydraulique compacte à piston radial excentré
CN102439312A (zh) * 2009-05-26 2012-05-02 胡斯可国际股份有限公司 紧凑的偏心式径向活塞液压机
EP3048301A1 (fr) * 2015-01-20 2016-07-27 Eaton Corporation Dispositif hydraulique à pistons radiaux avec mécanisme de transition de pression amélioré
US10378357B2 (en) 2015-01-20 2019-08-13 Eaton Intelligent Power Limited Hydraulic radial piston device with improved pressure transition mechanism
CN113530784A (zh) * 2021-07-21 2021-10-22 余世亮 一种新型变量径向柱塞泵

Also Published As

Publication number Publication date
FR2007300A1 (fr) 1970-01-02
GB1272083A (en) 1972-04-26
JPS4812019B1 (fr) 1973-04-17
DE1921976A1 (de) 1969-11-20

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