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WO1986000963A1 - Regulateur manuel et automatique pour une transmission hydrostatique - Google Patents

Regulateur manuel et automatique pour une transmission hydrostatique Download PDF

Info

Publication number
WO1986000963A1
WO1986000963A1 PCT/EP1985/000349 EP8500349W WO8600963A1 WO 1986000963 A1 WO1986000963 A1 WO 1986000963A1 EP 8500349 W EP8500349 W EP 8500349W WO 8600963 A1 WO8600963 A1 WO 8600963A1
Authority
WO
WIPO (PCT)
Prior art keywords
governor
pump
cylinder
prime mover
servocontrol
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
PCT/EP1985/000349
Other languages
English (en)
Inventor
Elio Vielmi
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.)
Sauer Italiana SpA
Original Assignee
Sauer Italiana SpA
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 Sauer Italiana SpA filed Critical Sauer Italiana SpA
Publication of WO1986000963A1 publication Critical patent/WO1986000963A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/46—Automatic regulation in accordance with output requirements
    • F16H61/465—Automatic regulation in accordance with output requirements for achieving a target input speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/002—Hydraulic systems to change the pump delivery
    • 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
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/42—Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity
    • F16H61/433—Pump capacity control by fluid pressure control means
    • 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
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/46—Automatic regulation in accordance with output requirements

Definitions

  • the subject of this present invention is a governor which acts on the servocontrol of. a variable-delivery pump, the latter being suitable for a closed circuit and such as to drive the motor at constant revs, whatever the number of revs of the prime mover driving the pump.
  • Said servocontrol normally consists of a distributor which continues to oscillate in its equilibrium position, determined by a manual control lever connected to the distributor by means of gears. These also comprise an elastic means which can istantaneously free said manual control lever from said servocontrol.
  • the proposed governor may be used for any kind of automatic control of the variable-delivery pump, without excluding the possibility of also controlling said pump manually. For example, using the 5. proposed device, the r.p.m. of the drum in truck mixers or other mixing equipment, agitators or the like can be maintained constant, the movement of vehicles in general can be controlled and also the actuating of auxiliary movement in road finishing machines, steamrollers, etc.
  • variable-delivery pump has been controlled only by using very complicated devices, which frequently break down.
  • patent US-A-3,212,263 illustrates a known type of variable-delivery hydraulic pump.
  • French patent application 2,264,991 describes a device 15. suitable for limiting the pressure in an open hydraulic circui .
  • German patent application 1,943,601 only describes the power control, not the governing of the motor speed.
  • German patent application 2,252,557 describes an 20. aut ⁇ natic device suitable for allowing variation in the number of revs of a pump. There is no mention at all of being able to obtain a constant number of revs in a motor.
  • the problem of transmitting motion from a variable-delivery pump to a hydraulic motor has never been completely sa ⁇ tisfactorily solved, especially where the variable-delivery pump is a second use of a variable-revs prime mover.
  • the latter also drives -a first use; for example, in truck mixers it provides for vehicle movement.
  • this first use requires the number of revs of the prime mover to be increased - for example, need to accelerate the engine because the vehicle is driving up a slope or overtaking - the hydraulic
  • the object of this invention is to carry out an 20. automatic control of the variable-delivery pump, while allowing also a manual control of the pump at the same time.
  • the proposed governor allows hydraulic driving of the second use at constant speed, 25. even when the number of revs of the prime mover varies.
  • the aforesaid object has been carried out by providing for the variable-delivery pump servocontrol to be actuated automatic ⁇ ally by means of a single-acting cylinder, the piston of which, subjected to the action of a spring, comprises 5. internally a slider .with free abutting end, which is connected to the servocontrol.
  • a preferred embodiment provides for the piston to be subjected to the action of a set of springs arranged in a pack, which have been calibrated differently one from the other so as to 10. adapt to the pressure curve imparted to the cylinder when being actuated.
  • a specific embodiment provides for the cylinder to be actuated by using the pressure produced by an auxiliary pump which, for example, is fitted directly on the prime mover.
  • Fig. 1 shows the hydraulic diagram of the proposed governor and, purely as an indication, its main mechanical 20. parts;
  • Fig. 2 shows a longitudinal section of the governor
  • Fig. 3 shows a section similar to Fig. 2, but forming part of a second embodiment
  • Fig. 4 is a cross section 4-4 of Fig. 2.
  • the proposed governor has been used in the examples which will be described as a governor for a variable-delivery pump 1 , connected to an motor M which must run at constant speed. This should however in no way be considered as binding.
  • variable-delivery pump 1 is driven by a prime mover MP, which impresses motion to the shaft 1A whereto is also splined the gear pump 1E.
  • the variable-delivery pump now being described, has an oscillating plate 1B pivoted at a fixed central point
  • variable-delivery pumps are fitted with a system for controlling the oscillating plate 1B driven by cylinders 20. 1D.
  • the external manual control 12 consisting of a lever with fulcrum 2A (Figs. 1 and 4)
  • pin 6B integral with said manual control 12 is displaced.
  • lever 21 is displaced. Said lever 21 connected to the connecting rod 23 thus moves pin 7B into a position such as to close the forked spring 2B. At the same time lever 21 moves rod 2C into the neutral position thereby stopping the flow of oil to the servocylinder 1D. As a result
  • control 17 from its neutral position. Through this play of balance between opening and closing of rod 2C of servocontrol 17 the displacement determined by the manual control 12 or the proposed governor is maintained constant.
  • a cylinder 11 which is typically fitted so as to be integral with the servocontrol 17, as can be seen in Figs. 2 and 3.
  • the cylinder 11 is actuated by a lever 2, integral with pin 7B, and having its fulcrum at 2A.
  • cylinder 11 overides manual control 12 because it acts directly on pin 7B and through the latter on connecting rod 23, and thereby on lever 21 and rod 2C.
  • Lever 2 is linked to connecting rod 24 and the latter to the slider 62, said lever not being however integral with the piston 61 in order
  • variable pump 1 available the variable pump 1 , the servocontrol 17 and a pump 1E directly connected to the prime mover MP.
  • the signal obtained before the throttling 2E is directly proportional to the revs of the prime mover MP.
  • the spings 4 arranged in a pack and suitably calibrated, oppose the force exerted by the piston 61 due to the variable pressure signal, allowing said piston 61 to be displaced in proportion to the said pressure.
  • Fig. 2 shows the constructional anbodiment of the proposed governing body 11. As stated above, it is constructed in such a way as to be integral with the servocontrol 17; in particular, it is placed above the latter and connected thereto by lever 2. This governing body may be used for a given direction of rotation of the hydraulic motor M; if the hydraulic motor rotates in the opposite direction, the 5. proposed governor is constructed as can be seen in Fig. 3. However, it is possible to provide a governor which governs for both directions of rotation of the hydraulic motor M.
  • the proposed governor works as follows-
  • selector 9 is positioned as shown in Fig.- 1.
  • this pressure is a function of the speed of the shaft 1A in the prime mover means - displaces the piston 61 as a function

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Fluid Gearings (AREA)

Abstract

Le régulateur proposé consiste en un cylindre à simple effet (11) dont le piston (61), soumis à une poussée élastique, comporte intérieurement un coulisseau ayant une extrémité libre d'aboutement qui est connectée à la servo-commande de la pompe. Dans un mode préférentiel de réalisation, la poussée élastique est produite par un ensemble de ressorts (4) disposés sous la forme d'un paquet et qui sont calibrés de manière à s'adapter à la courbe de pression arrivant au cylindre (11), en cours d'actionnement. On prévoit également l'actionnement du cylindre (11) en utilisant la pression produite par une pompe auxiliaire (1E) qui, par exemple, est montée directement sur le moteur principal.
PCT/EP1985/000349 1984-07-30 1985-07-15 Regulateur manuel et automatique pour une transmission hydrostatique Ceased WO1986000963A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT22124/84A IT1174619B (it) 1984-07-30 1984-07-30 Regolatore che permette di mantenere costante la velocita' di rotazione di un motore idraulico azionato da una pompa a portata variabile,anche al variare del numero di giri del motore primario
IT22124A/84 1984-07-30

Publications (1)

Publication Number Publication Date
WO1986000963A1 true WO1986000963A1 (fr) 1986-02-13

Family

ID=11191850

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1985/000349 Ceased WO1986000963A1 (fr) 1984-07-30 1985-07-15 Regulateur manuel et automatique pour une transmission hydrostatique

Country Status (5)

Country Link
EP (1) EP0222764A1 (fr)
JP (1) JPS61502832A (fr)
AU (1) AU4773185A (fr)
IT (1) IT1174619B (fr)
WO (1) WO1986000963A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009047040A1 (fr) * 2007-10-02 2009-04-16 Zf Friedrichshafen Ag Dispositif de réglage de la cylindrée de moteurs à pistons hydrauliques
US8262525B2 (en) 2007-10-02 2012-09-11 Zf Friedrichshafen Ag Hydrostatic-mechanical power split transmission
US8262530B2 (en) 2007-10-02 2012-09-11 Zf Friedrichshafen Ag Power-branched transmission
US8287414B2 (en) 2007-10-02 2012-10-16 Zf Friedrichshafen Ag Transmission device having a variator
US8323138B2 (en) 2007-10-02 2012-12-04 Zf Friedrichshafen Ag Power split transmission
US8328676B2 (en) 2007-10-02 2012-12-11 Zf Friedrichshafen Ag Power split transmission
US8393988B2 (en) 2007-10-02 2013-03-12 Zf Friedrichshafen Ag Transmission device for a vehicle
US8414439B2 (en) 2007-10-02 2013-04-09 Zf Friedrichshafen Ag Transmission device for a vehicle, having a variator
US8424633B2 (en) 2007-10-02 2013-04-23 Zf Friedrichshafen Ag Variable transmission device for a vehicle
US8752374B2 (en) 2007-10-02 2014-06-17 Zf Friedrichshafen Ag Device for adjusting the stroke volume of hydraulic piston machines

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1160734B (de) * 1958-09-18 1964-01-02 Kaemper Motoren G M B H Regelgeraet fuer Axialkolbenpumpen
US3212263A (en) * 1964-04-24 1965-10-19 Sundstrand Corp Hydrostatic transmission
FR1500912A (fr) * 1965-07-20 1967-11-10 Linde Ag Installation de commande d'un mécanisme à réglage continu
DE1943601A1 (de) * 1969-08-27 1971-03-11 Lucas Industries Ltd Pumpensteuereinrichtung
DE2252557A1 (de) * 1971-11-01 1973-05-03 Massey Ferguson Services Nv Drehzahlregelvorrichtung fuer hydraulische kraftuebertragungseinrichtungen
FR2264991A1 (en) * 1974-03-20 1975-10-17 Karl Marx Stadt Ind Werke Hydraulic pump regulator with positioner and control valve - has relief mechanism connected with pump pressure and control valve
GB1588885A (en) * 1977-10-26 1981-04-29 Zahnradfabrik Friedrichshafen Hydrostatic power transmission in series with a changespeed gear

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1160734B (de) * 1958-09-18 1964-01-02 Kaemper Motoren G M B H Regelgeraet fuer Axialkolbenpumpen
US3212263A (en) * 1964-04-24 1965-10-19 Sundstrand Corp Hydrostatic transmission
FR1500912A (fr) * 1965-07-20 1967-11-10 Linde Ag Installation de commande d'un mécanisme à réglage continu
DE1943601A1 (de) * 1969-08-27 1971-03-11 Lucas Industries Ltd Pumpensteuereinrichtung
DE2252557A1 (de) * 1971-11-01 1973-05-03 Massey Ferguson Services Nv Drehzahlregelvorrichtung fuer hydraulische kraftuebertragungseinrichtungen
FR2264991A1 (en) * 1974-03-20 1975-10-17 Karl Marx Stadt Ind Werke Hydraulic pump regulator with positioner and control valve - has relief mechanism connected with pump pressure and control valve
GB1588885A (en) * 1977-10-26 1981-04-29 Zahnradfabrik Friedrichshafen Hydrostatic power transmission in series with a changespeed gear

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009047040A1 (fr) * 2007-10-02 2009-04-16 Zf Friedrichshafen Ag Dispositif de réglage de la cylindrée de moteurs à pistons hydrauliques
US8262525B2 (en) 2007-10-02 2012-09-11 Zf Friedrichshafen Ag Hydrostatic-mechanical power split transmission
US8262530B2 (en) 2007-10-02 2012-09-11 Zf Friedrichshafen Ag Power-branched transmission
US8287414B2 (en) 2007-10-02 2012-10-16 Zf Friedrichshafen Ag Transmission device having a variator
US8323138B2 (en) 2007-10-02 2012-12-04 Zf Friedrichshafen Ag Power split transmission
US8328676B2 (en) 2007-10-02 2012-12-11 Zf Friedrichshafen Ag Power split transmission
US8393988B2 (en) 2007-10-02 2013-03-12 Zf Friedrichshafen Ag Transmission device for a vehicle
US8414439B2 (en) 2007-10-02 2013-04-09 Zf Friedrichshafen Ag Transmission device for a vehicle, having a variator
US8424633B2 (en) 2007-10-02 2013-04-23 Zf Friedrichshafen Ag Variable transmission device for a vehicle
US8752374B2 (en) 2007-10-02 2014-06-17 Zf Friedrichshafen Ag Device for adjusting the stroke volume of hydraulic piston machines
US8756931B2 (en) 2007-10-02 2014-06-24 Zf Friedrichshafen Ag Device for adjusting the stroke volume of hydraulic piston machines

Also Published As

Publication number Publication date
EP0222764A1 (fr) 1987-05-27
JPS61502832A (ja) 1986-12-04
IT8422124A0 (it) 1984-07-30
IT1174619B (it) 1987-07-01
AU4773185A (en) 1986-02-25

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Legal Events

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Designated state(s): AU BB BG BR DK FI HU JP KP KR LK MC MG MW NO RO SD SU US

AL Designated countries for regional patents

Designated state(s): AT BE CF CG CH CM DE FR GA GB IT LU ML MR NL SE SN TD TG

CFP Corrected version of a pamphlet front page
CR1 Correction of entry in section i

Free format text: IN PAT.BUL.04/86,UNDER INID (51) IPC 4 REPLACE "F16 39/50" BY "F16H 39/50"