AU656893B2 - Radial piston pump or engine - Google Patents

Radial piston pump or engine Download PDF

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Publication number
AU656893B2
AU656893B2 AU76567/91A AU7656791A AU656893B2 AU 656893 B2 AU656893 B2 AU 656893B2 AU 76567/91 A AU76567/91 A AU 76567/91A AU 7656791 A AU7656791 A AU 7656791A AU 656893 B2 AU656893 B2 AU 656893B2
Authority
AU
Australia
Prior art keywords
rollers
cylindrical inner
radial
guide element
main rollers
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.)
Ceased
Application number
AU76567/91A
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AU7656791A (en
Inventor
Ester Errante
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of AU7656791A publication Critical patent/AU7656791A/en
Application granted granted Critical
Publication of AU656893B2 publication Critical patent/AU656893B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/37—Loose spacing bodies
    • F16C33/3713—Loose spacing bodies with other rolling elements serving as spacing bodies, e.g. the spacing bodies are in rolling contact with the load carrying rolling elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B1/00—Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements
    • F01B1/06—Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements with cylinders in star or fan arrangement
    • F01B1/0641—Details, component parts specially adapted for such machines
    • F01B1/0668—Supporting and guiding means for the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/40—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings with loose spacing bodies between the rollers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/44—Needle bearings
    • F16C19/46—Needle bearings with one row or needles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/60—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings
    • F16C33/605—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings with a separate retaining member, e.g. flange, shoulder, guide ring, secured to a race ring, adjacent to the race surface, so as to abut the end of the rolling elements, e.g. rollers, or the cage

Abstract

A radial piston pump or engine wherein the thrust exerted by the pistons is transmitted to the cam (1) via a needle bearing (2) which comprises no outer roller ring so that the needles (2) roll directly on the cam (1). To reduce friction, the needles are kept apart by smaller diameter needles or spheres (3).

Description

OPI DATE 11/11/91 APPLN I D 76567 91 AOJP DATE 19/12/91 PCT MUMBER PCT/1T91/00029 Pcr DEMANDE INTERNAT16..j. A- AI-A i j w ,ETS (PCT) (51) Classification internationale des bievets 5 (1 I) N .um~ro de publication Internationale: WO 91/16547 F16C 19/40, 33/52, FOi1B 1/06 Al (43) Date de publication Internationale: 31 octobre 1991 (31.10.91) Num~ro de la deraande Internationale: PCT/1T91/00029 Pubie Ai'ec rapport de recherchze internationale.
(22) Date de d~p~t international: 10 avril 1991 (10.04.91) Avant l'expiration du d~lai pr~vu pour la modification des revendications, sera republi~e si do telles modifications sont repeu s.
Donr~es relatives i la prioriti6: 12450 A/90 24 avril 1990 (24.04.90) IT (71)X72) D36posant et inventeur: ERRANTE, Ester [IT/IT]; Via dei Sessanta, 18, 1-16152 Genova (IT).
(81) Etats disignits: AT, AT (brevet europ~en), AU, BE (brevet europ~en), BG, BR, CA, CH, CH (brevet europ~en), DE, DE (brevet europ~en), DK, DK (brevet europ~en), ES, ES (brevet europ~en), FR (brevet europ~en), GB, GB (brevet europ~en), GR (brevet europ~en), HU, IT (brevet europ~en), JP, KP, KR, LU (brevet euror,~en), NL, NL (brevet europ~en), NO, PL, RO, SE, SE (brevet europ~en), SU, US.
(54)Title: RADIAL PISTON PUMP OR ENGINE (54)Titre: POMPE OU MOTEUR A PISTONS RADIAUX Secr A 7 (57) Abstract A radial piston pump or engine wherein the thrust exerted by the pistons is transmitted to the camn via a needle bearing which compi ises no outer roller ring so that the needles roll dlirectly on the cam To reduce friction, the needles are kept apart by smaller diameter needles or spheres (57) Abrig Pompe ou moteur it piston radiaux dans lequel la pouss~c exerc~e par leb pistons est transmise sur la came par l'interrn~diaire d'un roulement it aiguilles qui ne comporte pas de bagues de roulement externe, le rouleinent des aiguilles s'effectuant sur la came directement Pour dii,.inuer le frottement. les aiguilles sont s~par~es entre elles par des aiguilles ou des sph~res de plus petit diam~te "Improvements to hydraulic pumps or motors of the radial cylinder type" The present invention relates to hydraulic pumps or motors of the radial cylinder type.
With reference to figure 1 of the annexed drawings, a conventional radial cylinder hydraulic pump or motor comprises a stator with a hollow guide element 1 having a cylindrical inner surface 2 and a rotor 3 which is rotatably mounted within the guide element 1 around an axis 4 which is offset from the axis of the cylindrical 0 surface 2. The rotor 3 has a number of radial cylinders o wherein radial pistons 6 are slidably mounted. Each piston 5 is provided at its radially outer end with a guide pad 7 which slides on the inner surface 2 of the guide element 1. A fixed cylindrical body 8 is arranged within an inner cavity of the rotor 3 and is provided with inlet and .oo: outlet ducts for the oil. In the operation as a pump, the rotor 3 is caused to rotate by a motor (not shown) so that S.the radial pistons 6 are urged outwardly by the centrifugal force. In some cases, springs or fluid pressure coming from an auxiliary pump are exploited in 00 order to increase the thrust urging the radial pistons outwardly.
In the above described conventional construction, the pads 7 are pivotally connected to the respective pistons and are pressed against the surface 2 of guide element 1 with the interposition of a film of oil under pressure fed through a hole formed through the pad itself. Such construction is not completely satisfactory, since it poses a limitation to the offset degree of axis 4 and to the speed of the rotor.
I- From U.S. Patent No. 2.130.299 'to Ernst and U.S. Patent No. 2,189,773 to Benedek a radial cylinder pump or motor is known wherein a continuous series of rollers is provided covering the inner surface of the guide element 1 and interposed between each piston pad and the inner surface of the guide element. Also in this case, however, each pad is connected to the respective piston through the engagement of the outer end of the piston in a seat of the pad. Also this known construction can be operated only with a minimum offset degree of the rotor axis and therefor poses again a limitation to the capacity and power of the pump. The reason of this limitation is that, due to the offset position of the rotor axis, each pad and 1 the outer end of the respective piston have a displacement relative to each other also in a tangential direction with respect to the rotor axis. Moreover, power losses occur as a consequence of the contact between adjacent rollers; which have opposed local speeds in the point of contact.
When two adjacent rollers touch each other the film of oil on the roller surfaces is broken, so that an abrupt increase in friction occurs which may eventually lead to seizure.
The main object of the present invention is to provide a radial cylinder pump or motor which overcomes the above mentioned drawbacks.
In order to achieve this object, the invention provides a radial cilinder hydraulic pump or motor, comprising: a stator with a hollow guide element, having a cylindrical inner surface, a rotor which is rotatably mounted within said guide element around an axJs offset from the axis of said cylindrical inner surface, said rotor having a plurality of radial cylinders .formed therein, r- i- 1 -3a plurality of radial pistons slidably mounted within said cylinders and having radially outer ends, each end being provided with a guide pad urged against said cylindrical inner surface, a continuous series of main rollers, covering said cylindrical inner surface and interposed between said inner surface and said guide pads of said radial pistons, said rollers having their ends supported by two supporting rings connected to said guide element, -a plurality of auxiliary rollers interposed in the space between each pair of adjacent main rollers and said o" cylindrical inner surface to prevent a direct contact of said adjacent main rollers, the space where said main rollers and auxiliary rollers are located being completely filled with oil.
0 In the construction according to the invention, due to the presence of the auxiliary rollers, any direct contact 00 between adjacent ones of the main rollers is prevented, °00° thus avoiding any power loss. In other words, the inner So. surface of the guide element is covered with the maximum possible number of main rollers, while avoiding at the oo same time direct contact of said rollers. Thus, a very high pressure can be distributed among a high number of rollers, while avoiding at the same time any friction loss.
Due to the above features, the machine according to the invention can provide a capacity and power much greater than those of the machines according to the prior art.
Further features and advantages of the invention will become apparent from the following description, provided purely by way of example, with reference to the annexed drawings in which: I L- Uzni i .i _I figure i is a cross'sectional view of a radial cylinder motor or pump according to the prior art, figure 2 shows a detail of the rollers provided on the inner surface of the stator hollow guide element in a radial cylinder motor or pump according to the invention, figure 3 is a cross-section taken along line III-III of figure 2, o figure 4 shows a variant of figure 2, and 04 S- figure 5 is a cross-section taken along line V-V of -figure 4.
0 The conventional construction shown in figure 1 has been explained already at the beginning of the present description.
The main distinguishing features of the machine according to the invention will be now described with reference to 0 figures 2-5. In these figures, parts corresponding to o .o those illustrated in figure 1 have been designated by the same reference numerals.
With specific reference to figures 2,3, a radial cylinder motor or pump of the invention comprises a stator la having a seat lb for the guide element 1. The inner surface 2 of the guide element 1 is covered by a continuous series of main rollers 9 whose ends are supported by two supporting rings 10, 11 rigidly connected to the guide element 1. The supporting rings 10, 11 each have a L-shaped cross-section. With reference to figure 2, in the space between each pair of adjacent rollers 9 and the cylindrical inner surface 2 of the guide element 1 there are provided auxiliary smaller rollers 12, which are chosen of such a size as to prevent direct contact between rollers 9, while allowing the maximum possible number of rollers 9 to be arranged on the surface 2.
Figures 4, 5 are variants of figures 2, 3 which refer to the case in which the surface 2 is directly provided on the stator la.
During the operation, for example as a pump, rotor 3 is caused to rotate by a motor (not shown) through a suitable a 4° coupling member, so that pistons 6 are caused to follow 0the inner cylindrical surface 2 of the guide element 1.
S, During this movement, the thrust of the pistons 6 is distributed among the highest possible number of rollers 9, while losses due to direct contact of rollers 9 are prevented by means of the auxiliary rollers 12.
00 Due to all the above-indicated features, the invention a enables the construction of a pump or a motor with a capacity and power much greater than those possible with a ;the known constructions.

Claims (1)

  1. 7. A radial cylinder hydraulic pump or motor, comprising: a stator with a hollow guide element having a cylindrical inner surface, a rotor which is rotatably mounted within said guide element around an axis offset from the axis of said cylindrical inner surface, said rotor having a plurality of radial cylinders formed therein, a plurality of radial pistons slidably mounted within said cylinders and having radially outer ends each i provided with a guide pad urged against said cylindrical inner surface, :o a continuous series of main rollers covering said cylindrical inner surface and interposed between said inner surface and said guide pads of said radial piston, said main rollers having there ends supported by two supporting rings connected to said guide element, a plurality of auxiliary rollers interposed in the space between each pair of adjacent main rollers and said •°cylindrical inner surface to prevent. a direct contact of oo.o: said adjacent main rollers, the space where said main rollers and auxiliary rollers are located being completely filled with oil. 2. A radial cylinder pump or motor according to claim 1, wherein the size of said auxiliary rollers is chosen so as to prevent any contact between said main rollers, while allowing the arrangement of the maximun possible number of main rollers on said cylindrical inner surface. ABSTRACT A radial cylinder hydraulic pump or motor has radial pistons each provided with a guide pad urged against the cylindrical inner surface of a guide element. A continuous series of rollers cover the cylindrical inner surface and are interposed between such surface and the guide pads. The rollers are prevented from coming in contact with each other by a number of auxiliary smaller rollers. 000 0 a o 00 Soo 00 oo a 0 0 o a o
AU76567/91A 1990-04-24 1991-04-10 Radial piston pump or engine Ceased AU656893B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT12450/90 1990-04-24
IT12450A IT1238749B (en) 1990-04-24 1990-04-24 REPLACEMENT IN RADIAL CYLINDER PUMPS AND MOTORS FOR OELODYNAMICS IN WHICH THE ANNULAR TRACK IS CONSTITUTED BY A ROLLER BEARING WITHOUT INTERNAL RING, OF THE LAST WITH A ROLLER SYSTEM WITHOUT CAGES POSITED ALMOST IN CONTACT WITH THEM.
PCT/IT1991/000029 WO1991016547A1 (en) 1990-04-24 1991-04-10 Radial piston pump or engine

Publications (2)

Publication Number Publication Date
AU7656791A AU7656791A (en) 1991-11-11
AU656893B2 true AU656893B2 (en) 1995-02-23

Family

ID=11140307

Family Applications (1)

Application Number Title Priority Date Filing Date
AU76567/91A Ceased AU656893B2 (en) 1990-04-24 1991-04-10 Radial piston pump or engine

Country Status (8)

Country Link
EP (1) EP0481046B1 (en)
AT (1) ATE123849T1 (en)
AU (1) AU656893B2 (en)
CA (1) CA2060502A1 (en)
DE (1) DE69110397T2 (en)
ES (1) ES2075447T3 (en)
IT (1) IT1238749B (en)
WO (1) WO1991016547A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2130299A (en) * 1936-02-10 1938-09-13 Hydraulic Press Corp Inc Radial pump
US2189773A (en) * 1935-08-09 1940-02-13 Elek K Benedek Hydraulic pump or motor
GB2209059A (en) * 1987-08-27 1989-04-26 Edward Robert Whittley Roller bearings

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1335536A (en) * 1962-06-08 1963-08-23 Alsacienne Atom Improvement in needle bearings and the like

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2189773A (en) * 1935-08-09 1940-02-13 Elek K Benedek Hydraulic pump or motor
US2130299A (en) * 1936-02-10 1938-09-13 Hydraulic Press Corp Inc Radial pump
GB2209059A (en) * 1987-08-27 1989-04-26 Edward Robert Whittley Roller bearings

Also Published As

Publication number Publication date
AU7656791A (en) 1991-11-11
IT1238749B (en) 1993-09-03
IT9012450A0 (en) 1990-04-24
ATE123849T1 (en) 1995-06-15
IT9012450A1 (en) 1991-10-24
DE69110397T2 (en) 1996-03-21
EP0481046B1 (en) 1995-06-14
EP0481046A1 (en) 1992-04-22
CA2060502A1 (en) 1991-10-25
DE69110397D1 (en) 1995-07-20
ES2075447T3 (en) 1995-10-01
WO1991016547A1 (en) 1991-10-31

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