WO1998033989A1 - Dispositif pour engin hydraulique - Google Patents

Dispositif pour engin hydraulique Download PDF

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Publication number
WO1998033989A1
WO1998033989A1 PCT/SE1998/000072 SE9800072W WO9833989A1 WO 1998033989 A1 WO1998033989 A1 WO 1998033989A1 SE 9800072 W SE9800072 W SE 9800072W WO 9833989 A1 WO9833989 A1 WO 9833989A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
accumulator
hydraulic
cylinder
valve
Prior art date
Application number
PCT/SE1998/000072
Other languages
English (en)
Inventor
Lars Bruun
Original Assignee
Lars Bruun
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 Lars Bruun filed Critical Lars Bruun
Priority to AU58877/98A priority Critical patent/AU5887798A/en
Publication of WO1998033989A1 publication Critical patent/WO1998033989A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B66C13/20—Control systems or devices for non-electric drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/54—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with pneumatic or hydraulic motors, e.g. for actuating jib-cranes on tractors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2271—Actuators and supports therefor and protection therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/14—Energy-recuperation means

Definitions

  • the present invention relates to a device for a hydraulic system, which system comprises a number of hydraulic cylinders and a number of accumulators pre-charged at a certain pressure, which communicate via connections with one side of the hydraulic cylinders, in which the force in one movement direction of the cylinder is obtained mainly from the energy stored in the accumulator.
  • Hydraulically operated and manoeuvred working equipment is very common in a number of fields.
  • One example is hydraulic cranes which are used in the handling of goods, on lorries, vessels, forestry machinery, in almost all spheres of load handling.
  • Another example is digging units on excavators, tractors and similar contract machinery.
  • an accumulator pre-charged to a certain pressure is connected to an auxiliary cylinder, which auxiliary cylinder is disposed parallel to a lifting cylinder intended to raise a lifting arm or main arm on a crane.
  • the auxiliary cylinder is filled with oil, which oil, when the arm is lowered, will flow into the accumulator and compress the gas volume in this.
  • the auxiliary cylinder now operates with the pressure in the accumulator actively in the lifting work so that to a large extent it is only useful work which the lifting cylinder performs.
  • the system with accumulators can be enlarged to include the cylinder for a telescopic arm also.
  • the accumulator is then connected to the drawing-in side of the cylinder, i.e. when the telescopic arm is extended, the pressure on the drawing-in side will increase, at which the pressure m the accumulator increases This pressure is used on retraction
  • the use of the accumulators means that the pressure and flow requirement in the system as a whole is reduced, and the maximum pressure level is reduced Due to the fact that the requirement is reduced, several -unctions can be executed at the same time, which was not possible with previous systems
  • a device for a hydraulic system which svstem comprises a number of hydraulic cylinders and a number of accumulators, pre-charged at a certain pressure which communicate via connections with one side of the hvdrau c cylinders, in which the force in one movement direction of the cylinder is obtained mainly from the energy stored in the accumulator, characterized in that a hydraulic line is connected to said connection between accumulator and hydraulic cylinder, capable of supplying hydraulic oil at a pressure which is equal to or slightly under the selected pre-charging pressure in the accumulator.
  • Fig. 1 shows a knuckle boom for lifting and handling goods.
  • the drawings show a knuckle boom 1.
  • the general design of the crane is conventional.
  • the main components of the crane 1 are constituted by a column or pillar 2. which is swivellable on a crane base 3, a lifting arm 4 (also referred to in the industry as the main arm), a luffing arm 5, a telescopically extensible arm 41 (also referred to in the industry as a telescopic arm) arranged in the luffing arm 5 via front and rear sliding devices 43.
  • a gripping device 6, a lifting cylinder 7 for raising the lifting arm 4 by rotation around the horizontal axis of rotation of the lifting arm.
  • a luffing cylinder 8 for operating the luffing arm 5 relative to the lifting arm 4 by rotation in a folding hinge 10, and a hydraulic cylinder 11 for the telescopic arm 41 , henceforth termed telescopic cylinder.
  • the telescopic cylinder 11 is arranged so that the cylinder is fitted to the luffing arm 5 and the piston rod is assigned to the telescopic arm 41.
  • an auxiliary cylinder 20 is also arranged between the column 2 and the lifting arm 4.
  • the piston rod 21 is fastened via a first, lower, horizontal auxiliary cylinder fixing shaft 22 in the bearing device 13 on the column, while the auxiliary cylinder 20 is fastened via a second, upper horizontal auxiliary cylinder fixing shaft 23 in a bearing device 24 on the lifting arm.
  • the fixing shafts 22 and 23 of the auxiliary cylinder lie at a distance from the two fastening shafts 12 and 14 of the lifting cylinder 7, more precisely defined further away from the column 2 and from the axis of rotation 9 of the lifting arm 4.
  • auxiliary cylinder 20 it is also possible and can be more advantageous inter alia for practical reasons to place the auxiliary cylinder 20 by the side of the lifting cylinder 7 and mounted on the same fastening shafts 12 and 14 as the lifting cylinder. It is also possible and also convenient to set up two auxiliary cylinders 20, especially since the fastening shafts of the auxiliary cylinder and the lifting cylinder are common, in which case an auxiliary cylinder can be disposed on each side of the lifting cylinder 7.
  • the auxiliary cylinder 20 can be completely pneumatic and contain a closed gas volume, preferably nitrogen.
  • the auxiliary cylinder 20 consists in this case of a gas spring.
  • the auxiliary cylinder 20 consists instead of a hydraulic cylinder.
  • a hydraulic line 26 connected to the auxiliary cylinder is arranged with a branch line 25, which in this case is connected to a gas accumulator 27, which can be of any conventional type, preferably of the piston type, although a gas accumulator of the diaphragm type can also be used in principle.
  • the former type is preferably used.
  • a gas accumulator of this kind contains a piston, shown symbolically by 28, which divides the gas accumulator cylinder into two sections, a hydraulic part 29 which is connected to the auxiliary cylinder via the lines 25, 26 and a pneumatic part 30. which is filled with nitrogen gas under pressure.
  • a connection for the initial supply of nitrogen gas is designated 31.
  • a pressure limiting valve 34 Disposed in a branch line 33 connected to the hydraulic line 25 is a pressure limiting valve 34, normally termed a choke valve in the industry, a term which will be used below, the function of which valve will be described below.
  • the choke valve can also be a sequence valve.
  • the branch line 33 continues after said valve to a servo system, which is shown symbolically by 36.
  • the servo system maintains a defined over-pressure, e.g. 16 bar, which is considerably lower than the operating pressure of the crane system.
  • the line 26 communicates with the hydraulic pump 18 of the device via a non-return valve 82 and a pressure limiting valve 80. The function of these components will be described below.
  • the lifting cylinder consists of a double-acting cylinder with a lower port A and an upper port B.
  • a hydraulic circuit for the lifting cylinder is shown in simplified form, comprising an oil tray 38, a multiple-way valve 39 and hydraulic lines 45, 47 from the valve to the ports on the lifting cylinder, which valve 39 is capable of connecting the hydraulic lines either to the pressure source 18 or the oil tray 38
  • the hydraulic system comprises a pressure sensor and signal generator 48 disposed between the lines 45 and 47.
  • Nitrogen gas is initially supplied and enclosed in the gas accumulator 27, this being executed in connection with assembly on the manufacturer's premises
  • the accumulator is thus pre-charged at a certain pressure Following this hydraulic oil is supplied to the hydraulic system
  • the device thus equipped operates in the following manner. It is assumed that the lifting arm 4 is located in its lowest position, that the hydraulic system is filled with oil and that the crane system is to be balanced by exploiting the options which the invention offers In this connection the lifting arm is raised by means of the lifting cylinder 7 due to oil being routed via the valve 39 into the main piston via Port A
  • the auxiliary cylinder 20 and the accumulator 27 are provided with pressurized oil via the pressure limiting valve 80 and non-return valve 82
  • the pressure limiting valve 80 is set so that the pressure is equal to or slightly below the selected pre-charging pressure in the accumulator 27 Raising of the lifting arm 4 can continue up to the maximum position
  • the lifting arm 4 is then let back down, the hydraulic oil from the lifting cylinder being drained off to the oil tray 38
  • the oil pressure in the auxiliary cylinder 20 will then increase, which means that the gas volume in the gas accumulator 27 is compressed until a balancing position is attained If the oil pressure increases above a defined maximum pressure set at the choke valve
  • the work performed by the lifting cylinder 7 basically consists of useful work, i.e. for the purpose of handling the load which is located in the gripper 6. It must be realized that the centre of gravity of the crane system varies depending on the position and angular relationship of the luffing arm 5 with the lifting arm 4, which means that in unfavourable moment conditions, i.e. when the gripper 6 is located far out from the axis of rotation 9, the lifting cylinder 7 is utilized to a certain degree also to be able to raise the integrated crane arm's own weight
  • the work which the lifting cylinder 7 has to perform, with or without an actual load in the gripper 6, is however very considerably less than in conventional systems without the auxiliary cylinder 20 according to the invention
  • the lifting cylinder 7 and auxiliary cylinder 20 are suitably dimensioned in such a way that the work required for the lifting arm's upward movements can be performed basically by means of the energy which is stored in the form of compressed gas in the gas accumulator 27, due to which the lifting cylinder 7 and pressure source 18 can be dimensioned in the first instance to execute the desired useful work, i.e to lift and handle the load in the gripper 6
  • the crane can also be equipped with a pressure accumulator 40 assigned to the telescopic cylinder 11
  • the pressure accumulator 40 is connected via lines 42 to the rod side of the telescopic cylinder 11
  • a hydraulic circuit 44 which comprises an oil tray 38, pressure source 18 and a valve 50, which connects only the piston side of the cylinder with either the pressure source 18 or the tray 38 via connections 51
  • the gas accumulator can be of any conventional type, preferably of the same type as described above, which comprises a piston 52, a hydraulic part 54 which is connected to the telescopic cylinder 11 via the line 42 and a pneumatic part 56. which is filled with nitrogen gas under pressure, i.e. pre-charged to a certain pressure
  • a pressure limiting valve 62 normally termed a choke valve in the industry.
  • the branch line 60 continues after said valves to the servo system 36.
  • a branch line 84 which line provides the rod side and the accumulator with oil pressurized via a pressure limiting valve 86 and a non-return valve 88 to a pressure equal to or just under the pre-charging pressure of the accumulator.
  • the normal pattern of movement for a knuckle boom is as follows. On the crane's outgoing movement, normally to fetch the load, the main arm 4 is lowered, the luffing arm 5 is raised and the telescopic arm 41 is extended if required, the last-named due to the fact that pressurized oil is introduced via the valve 50 to the piston side of the telescopic arm. This means that the pressure in the oil on the rod side and thus in the pressure accumulator 40 increases, at which the piston 52 in the accumulator is moved and means that the gas pressure in the pneumatic part 56 increases. If the pressure should increase above a maximum pressure set in the choke valve 62, this will trigger and the pressure will be reduced.
  • the normal procedure is that the main arm 4 is raised, the luffing arm 5 lowered and the telescopic arm 41 retracted, at which the valve 50 is set such that the piston side communicates with the oil tray 46.
  • the pressure in the gas then acts on the piston in the accumulator and the hydraulic oil, whereupon the telescopic arm draws in the telescopic arm 41 using chiefly the pressure built up in the accumulator 40.
  • connection of the rod side and the accumulator to a pressure source 18 via the line 84 ensures that a minimum pressure and oil is always present in the circuit. If this connection should not exist, there is a risk that an oil shortage will occur on the rod side if the choke valve releases for different reasons and lets oil through.
  • Venting can take place of these parts in the system, which were not otherwise in direct communication with the pressure source. Pressure changes in the accumulators due to temperature changes which affect the pre-charging pressure can be compensated for.
  • the system is pressurized at a set minimum pressure. Changing the oil of the aforesaid parts in the system can take place, which could only have been carried out with difficulty without the connections. Compensating for a reduction in the amount of oil in these parts caused by the triggering of choke valves, leakage and the like is likewise possible using the device.
  • valve 90 connected between the non-return valve and the hydraulic cylinder/accumulator to enable the pressure on the system to be relieved if so required.
  • a valve 90 for the auxiliary cylinder for the main arm is drawn in. It is to be understood that a valve of this kind is also intended to be connected to the circuit for the telescopic cylinder.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Automation & Control Theory (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

L'invention concerne un dispositif destiné à un système hydraulique, ce système comprenant un nombre de vérins hydrauliques (20, 11) et un nombre d'accumulateurs (27, 40) précomprimés à une certaine pression et communiquant avec une extrémité des vérins hydrauliques par des connexions (25, 42). La force s'exerçant dans un sens de mouvement du vérin résulte principalement de l'énergie stockée dans l'accumulateur. L'invention se caractérise en ce qu'une conduite hydraulique (26, 84) est reliée à ladite connexion raccordant l'accumulateur et le vérin hydraulique, permettant ainsi de fournir de l'huile hydraulique à une pression égale ou légèrement inférieure à la pression de précompression régnant dans l'accumulateur.
PCT/SE1998/000072 1997-01-31 1998-01-19 Dispositif pour engin hydraulique WO1998033989A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU58877/98A AU5887798A (en) 1997-01-31 1998-01-19 Device for hydraulically operated working machine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9700297-6 1997-01-31
SE9700297A SE9700297D0 (sv) 1997-01-31 1997-01-31 Anordning vid hydrauliskt manövrerade arbetsredskap

Publications (1)

Publication Number Publication Date
WO1998033989A1 true WO1998033989A1 (fr) 1998-08-06

Family

ID=20405586

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/000072 WO1998033989A1 (fr) 1997-01-31 1998-01-19 Dispositif pour engin hydraulique

Country Status (3)

Country Link
AU (1) AU5887798A (fr)
SE (1) SE9700297D0 (fr)
WO (1) WO1998033989A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1614814A2 (fr) * 2004-07-07 2006-01-11 Liebherr-Hydraulikbagger GmbH Excavatrice et machine pour le transfert de matériel.
US20100018195A1 (en) * 2008-07-24 2010-01-28 Liebherr-Hydraulikbagger Gmbh Piece of Working Equipment
WO2010089518A1 (fr) 2009-02-09 2010-08-12 Manu Lorraine Système hydraulique d'engin de manutention ou de terrassement avec accumulateur d'énergie.
WO2012013253A1 (fr) * 2010-07-27 2012-02-02 Hydac Technology Gmbh Dispositif pour la récupération d'énergie
EP2690292A1 (fr) * 2011-03-21 2014-01-29 Shuanglai Yang Système de relevage et procédé de relevage pour la flèche d'un engin de chantier, et engin de chantier pour ce procédé
WO2014017958A1 (fr) * 2012-07-26 2014-01-30 Volvo Construction Equipment Ab Tringlerie équilibrée
WO2021071687A1 (fr) * 2019-10-07 2021-04-15 Caterpillar Global Mining Llc Procédé et appareil pour faire fonctionner un outil de travail de machine
IT201900020685A1 (it) * 2019-11-12 2021-05-12 De Hieronymis Carlo Maria Rozzi Apparecchiatura oleodinamica, e relativo metodo, per il recupero di energia in una macchina operatrice

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1180680B (de) * 1962-03-30 1964-10-29 Gewerk Eisenhuette Westfalia Schaufellademaschine
EP0388641A2 (fr) * 1989-03-21 1990-09-26 Hanomag Aktiengesellschaft Système hydraulique pour engins de terrassement, notamment pour chargeurs, tracteurs ou similaires
US5579868A (en) * 1993-06-01 1996-12-03 Kone Oy Procedure for operating an elevator, and an elevator machinery

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1180680B (de) * 1962-03-30 1964-10-29 Gewerk Eisenhuette Westfalia Schaufellademaschine
EP0388641A2 (fr) * 1989-03-21 1990-09-26 Hanomag Aktiengesellschaft Système hydraulique pour engins de terrassement, notamment pour chargeurs, tracteurs ou similaires
US5579868A (en) * 1993-06-01 1996-12-03 Kone Oy Procedure for operating an elevator, and an elevator machinery

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1614814A3 (fr) * 2004-07-07 2007-05-02 Liebherr-Hydraulikbagger GmbH Excavatrice et machine pour le transfert de matériel.
US7434391B2 (en) 2004-07-07 2008-10-14 Liebherr-Hydraulikbagger Gmbh Excavator and a machine for material transfer
EP1614814A2 (fr) * 2004-07-07 2006-01-11 Liebherr-Hydraulikbagger GmbH Excavatrice et machine pour le transfert de matériel.
US20100018195A1 (en) * 2008-07-24 2010-01-28 Liebherr-Hydraulikbagger Gmbh Piece of Working Equipment
US8418451B2 (en) 2008-07-24 2013-04-16 Liebherr-Hydraulikbagger Gmbh Piece of working equipment
WO2010089518A1 (fr) 2009-02-09 2010-08-12 Manu Lorraine Système hydraulique d'engin de manutention ou de terrassement avec accumulateur d'énergie.
WO2012013253A1 (fr) * 2010-07-27 2012-02-02 Hydac Technology Gmbh Dispositif pour la récupération d'énergie
EP2952773A1 (fr) * 2010-07-27 2015-12-09 Hydac Technology Gmbh Dispositif de recuperation d'energie
US9638217B2 (en) 2011-03-21 2017-05-02 Shuanglai Yang Lifting system and lifting method for jib of an operating machine, and an operating machine thereof
EP2690292A1 (fr) * 2011-03-21 2014-01-29 Shuanglai Yang Système de relevage et procédé de relevage pour la flèche d'un engin de chantier, et engin de chantier pour ce procédé
EP2690292A4 (fr) * 2011-03-21 2015-04-15 Shuanglai Yang Système de relevage et procédé de relevage pour la flèche d'un engin de chantier, et engin de chantier pour ce procédé
WO2014017958A1 (fr) * 2012-07-26 2014-01-30 Volvo Construction Equipment Ab Tringlerie équilibrée
WO2021071687A1 (fr) * 2019-10-07 2021-04-15 Caterpillar Global Mining Llc Procédé et appareil pour faire fonctionner un outil de travail de machine
CN114502801A (zh) * 2019-10-07 2022-05-13 卡特彼勒环球矿业有限责任公司 用于操作机器作业工具的方法和设备
CN114502801B (zh) * 2019-10-07 2024-03-08 卡特彼勒环球矿业有限责任公司 用于操作机器作业工具的方法和设备
IT201900020685A1 (it) * 2019-11-12 2021-05-12 De Hieronymis Carlo Maria Rozzi Apparecchiatura oleodinamica, e relativo metodo, per il recupero di energia in una macchina operatrice
WO2021095066A1 (fr) * 2019-11-12 2021-05-20 Carlo Maria Rozzi De Hieronymis Appareil hydraulique et procédé pour la récupération d'énergie dans une machine opérationnelle

Also Published As

Publication number Publication date
SE9700297D0 (sv) 1997-01-31
AU5887798A (en) 1998-08-25

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