EP2580079A1 - Hydraulic system - Google Patents
Hydraulic systemInfo
- Publication number
- EP2580079A1 EP2580079A1 EP11719197.3A EP11719197A EP2580079A1 EP 2580079 A1 EP2580079 A1 EP 2580079A1 EP 11719197 A EP11719197 A EP 11719197A EP 2580079 A1 EP2580079 A1 EP 2580079A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- pressure
- pressure fluid
- fluid chamber
- pressure medium
- 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.)
- Withdrawn
Links
Classifications
-
- 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
- F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
-
- 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
- E02F9/2278—Hydraulic circuits
- E02F9/2289—Closed circuit
-
- 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
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
-
- 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
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/047—Preventing foaming, churning or cavitation
-
- 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
- F15B1/04—Accumulators
- F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
- F15B1/24—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with rigid separating means, e.g. pistons
-
- 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
- F15B2201/00—Accumulators
- F15B2201/20—Accumulator cushioning means
- F15B2201/205—Accumulator cushioning means using gas
-
- 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
- F15B2201/00—Accumulators
- F15B2201/30—Accumulator separating means
- F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
-
- 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
- F15B2201/00—Accumulators
- F15B2201/30—Accumulator separating means
- F15B2201/32—Accumulator separating means having multiple separating means, e.g. with an auxiliary piston sliding within a main piston, multiple membranes or combinations thereof
-
- 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
- F15B2201/00—Accumulators
- F15B2201/40—Constructional details of accumulators not otherwise provided for
- F15B2201/415—Gas ports
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20561—Type of pump reversible
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/61—Secondary circuits
- F15B2211/613—Feeding circuits
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/8609—Control during or prevention of abnormal conditions the abnormal condition being cavitation
Definitions
- the invention relates to a hydraulic system, in particular for a commercial vehicle, such as a construction machine, with a pressure medium pump, which supplies a consumer with pressure medium.
- Hydraulic equipment for commercial vehicles in particular for construction machinery, agricultural machinery and off-road work machines including forklifts, are generally composed of several hydrostatic drive systems. In addition to the steering hydraulics, these include the cooling, control and feeding hydraulics as well as the driving hydraulics. Depending on their basic structure, these systems can work partially independently of each other and fulfill their respective function.
- the steering system In moving construction machines, the steering system is regularly operated with a steering valve with so-called "open center", a constant pump often formed as external gear pump promotes pronouncebetätigtem steering system against the pressure fluid tank of the construction machine
- the promotion of pressure medium within an open system thus formed usually takes a Vane pump with adjustable displacement volume
- the components cooling, control and supply circuit can be supplied with only one pressure medium pump, which can be an external gear pump with a constant flow rate Displacement volume, which is attached to a power take-off of an internal combustion engine as a motor unit.
- a cooling motor formed, for example, as an external gear constant motor a parallel connection of the control and supply hydraulic circuit can be provided.
- the control pressure system is used for signal transmission of certain machine characteristics, such as the control of a disk parking brake or a swivel angle adjustment device of the drive pump by means of trigger valve.
- certain machine characteristics such as the control of a disk parking brake or a swivel angle adjustment device of the drive pump by means of trigger valve.
- the invention is therefore based on the object to provide a hydraulic system for a commercial vehicle, which on the one hand allows a reduction in performance for the internal combustion engine and on the other hand, the problem of cavitation is solved.
- This object is achieved with a hydraulic system with the features of claim 1 in its entirety.
- a make-up device is part of the hydraulic system to automatically compensate for leakage oil losses and to supply the leakage losses to the low-pressure fluid chamber. The make-up device is thereby actuated during a displacement movement of a piston in the high-pressure fluid chamber, in particular when the pressure medium pump brings the piston into contact with the piston-cylinder arrangement of the make-up device.
- the low-pressure fluid chamber and the high-pressure fluid chamber are arranged in a particularly preferred embodiment of the hydraulic system part of a single double-piston accumulator and thus in a particularly compact form in the hydraulic system.
- the dessert makeup device may be housed in a housing containing the low pressure fluid space and the high pressure fluid space encloses be arranged. It is advantageous to design the make-up device as a piston-cylinder arrangement, wherein a single-acting piston in the sense of filling a working space of the piston-cylinder arrangement can be biased by a spring element with pressure medium. The spring element thus ensures automatic filling of the make-up device with pressure medium.
- the relevant piston in the high-pressure fluid space is not in an end position facing the make-up device, but the high-pressure fluid space is in a partially filled state.
- the make-up is done by the valve when it is switched by the piston.
- the make-up device or the working space of the make-up device is connected to a fluid-carrying connection between the pressure medium container and the low-pressure fluid space such that in each case in the portion of the fluid-carrying connection between the pressure medium container and the make-up device or the make-up device and the low-pressure fluid space Check valve is arranged.
- the two check valves have an opening direction in the sense that pressure medium from the pressure medium container in the working space of the make-up device and from there into the low-pressure fluid space can flow, but not vice versa.
- the make-up device thus presents itself as a piston pump controlled by non-return valves as a function of the pressure in the high-pressure fluid chamber.
- a push rod or a permanently connected to the piston of the make-up device component is thereby acted against the force of the piston acting on the spring with a pushing force.
- the thrust force applied to the push rod by the piston of the high-pressure fluid space displaces the pressure medium in the work space of the make-up device in the direction of the low-pressure fluid space.
- a backflow the pressure medium from the low pressure fluid space is prevented by the check valve.
- the high pressure fluid space and the low pressure fluid space can be advantageously combined in a dual piston accumulator.
- the double piston accumulator has a housing which accommodates at least two longitudinally movable pistons.
- the pistons are connected to each other with a coupling element, wherein the coupling element is guided even in a central position longitudinally movable through a partition wall of the housing.
- the dividing wall defines with the two adjacently opposed pistons a high-pressure fluid space and a low-pressure fluid space, which is operatively connected to the coupling element and defines, at least with the housing, a biasing space.
- the pressure medium in the low-pressure fluid chamber can be used to supply a pilot control device for the flow rate and conveying direction of the pressure medium pump.
- the coupling element is formed in a particularly preferred embodiment example as a coupling rod, the ends of which are each firmly connected to the associated piston.
- the entire pressure medium flow can be directed from the pressure medium pump to the consumer (s) via the double piston accumulator.
- the working space can be arranged for the dessert device.
- the coupling rod can protrude a fixed housing piston, which changes the volume of the limited work space by a movement of the coupling rod.
- the piston is designed in the manner of a hollow piston and is able to guide the pressure medium out of the working space or to introduce it into the working space through a channel in the longitudinal direction in its interior.
- the piston of the high pressure fluid space may be biased by a gas pressure of a biasing space as mentioned.
- the biasing space may be acted upon by a gas pressure in a gas supply device.
- the preload space is limited by a fixed end wall of the housing of the high-pressure fluid chamber or the double-piston accumulator.
- the end wall preferably has a connection point for the gas supply device, for example in the manner of a nitrogen storage.
- Figure 1 is a schematic diagram of a hydraulic system with a separate arrangement of a high-pressure fluid chamber of a low-pressure fluid chamber, with the inclusion of a pressure medium pump with VörderraumsumLite and variable displacement.
- FIG. 2 shows a schematic circuit diagram of a hydraulic system with an arrangement of the high-pressure fluid chamber and the low-pressure fluid chamber in a common housing of a double piston accumulator with actuation of the piston of the make-up device by a piston in the low-pressure fluid chamber.
- FIG. 3 shows a schematic circuit diagram of a hydraulic system according to the illustration according to FIG. 1, wherein the piston of the make-up device can be actuated from another piston side of the piston in the low-pressure fluid chamber;
- FIG. 4 is a schematic circuit diagram of a hydraulic system with an arrangement of the high-pressure fluid space and the low-pressure fluid space in a common housing of a Double piston accumulator, wherein a working space of the make-up device is arranged in a coupling element of the two pistons of the double piston accumulator; and
- FIG. 5 shows a concluding further schematic circuit diagram of a hydraulic system according to the illustration according to FIG. 4, wherein a housing-fixed piston of the make-up device is guided through a housing wall of the low-pressure fluid chamber and fixed thereon.
- a hydraulic circuit 1 for a work machine for example in the form of a conventional construction machine, partially in a schematic circuit diagram.
- the hydraulic system 1 has a pressure medium pump 2, which can be driven by an internal combustion engine, for example in the form of a diesel engine.
- Pressure medium pump 2 is designed as a reversible pump in its conveying direction, the delivery rate is also adjusted by a hydraulic pilot control device 21 accordingly.
- a trained in the manner of a piston accumulator high-pressure fluid chamber 5 is arranged.
- the high-pressure fluid chamber 5 is in turn arranged in a cylindrical housing 26, in which a piston 6 is guided longitudinally movable.
- the piston 6 can be biased towards the high-pressure fluid chamber 5 by various constructive measures.
- On its rear side for example, a working gas in the form of nitrogen gas or the like act.
- the pressure medium pump 2 takes biased pressure medium 3 from a low-pressure fluid chamber 4, which may be arranged in a likewise cylindrical housing 27.
- Another piston 7 is in the housing 27th also arranged axially movable and biased by a spring element or working gas in the direction of the low-pressure fluid chamber 4 out.
- the pressure medium pump 2 thus extracts prestressed pressure medium 3 and, independently of the pressure medium requirement of the consumption or of the plurality of consumers, always conveys prestressed pressure medium into the high-pressure fluid space 5, so that cavitation in the hydraulic system is avoided.
- the fluid pressure medium 3 prestressed in a fluid-conducting connection 28 between the low-pressure fluid chamber 4 and the pressure medium pump 2 is suitable for providing energy for the pilot-control device 21 of the pressure medium pump 2.
- the flow rate can be changed by the actuation of a hydraulic cylinder unit and a cam ring, on the inside of which conveying elements of the pressure medium pump 2 roll off or slide off.
- the designated 27 device needs to be no piston accumulator and could also consist of a different type of hydraulic accumulator.
- a make-up device 8 is provided.
- the make-up device 8 can be actuated by the piston 6 in the high-pressure fluid chamber 5.
- the make-up device 8 is formed as a piston-cylinder arrangement 1 1, including arranged in a thickened housing cover 29, a single-acting piston 12 in a cylindrical working space 13 movable.
- the piston 12 is acted upon on the back by a spring element 14 in the manner of a helical compression spring with a compressive force.
- the piston 12 On its other, opposite side, the piston 12 has a piston rod 30, which opens in the direction of the piston 6 in the direction of an actuating part in the high-pressure fluid chamber 5 and the rest in the housing cover 29 is slidably guided.
- the rear working space 13 is filled with pressure medium 3.
- the piston 6 moves upward in the viewing direction of FIG. 1, pushing the piston rod 30 and the piston 12 of the make-up device 8 also against the pressure of the spring element 14 further up.
- the spring bias of the compression spring 14 may also be selected such that upon an upward movement of the piston 6, the displaced volume is sufficient to move the piston 12 without the two pistons having to abut one another.
- a fluid-carrying connection 15 from a pressure medium container 9 in the form of a conventional tank, via the make-up device 8 to the low-pressure fluid chamber 4, two check valves 16, 1 7 are arranged.
- the check valve 16 is arranged between the pressure medium container 9 and the working space 1 3 of the make-up device 8, seen with a blocking position in the direction of the pressure medium container 9 and with an opposite opening direction, ie in the direction of the make-up device 8.
- the further check valve 1 7 is arranged between the make-up device 8 and the low-pressure fluid chamber 4, wherein the locking direction takes place in the direction of the make-up device 8 and the opposite opening direction in the direction of the low-pressure fluid chamber 4 is provided.
- FIGS. 2 to 5 show further exemplary embodiments of the arrangement of the high-pressure fluid chamber 5 and the low-pressure fluid chamber 4.
- the fluid spaces mentioned here are summarized in the design of a double-piston accumulator 10.
- a cylindrical housing 18 of the double-piston accumulator 10 has a partition wall 20 arranged approximately in its axial center.
- the fluid spaces 4, 5 are located on both sides of the partition wall 20.
- a high pressure fluid space 5 and on the right side a low pressure fluid space 4 are arranged in each fluid space.
- a piston 6, 7 arranged axially movable.
- the pistons 6, 7 are firmly connected to one another with the aid of a coupling element 19 designed as a cylindrical piston rod, so that its axial travel path, in contrast to the pistons in FIG. 1, always together in the sense of a forced connection in the same, but changing direction over the same distance he follows.
- the coupling rod 22 is sealingly guided with sealing elements 31 in the partition wall 20.
- the piston 6 in the high-pressure fluid chamber 5 is biased on its side facing away from the piston rod 22, originating from a pressure accumulator 25 with a working gas.
- the end wall 32 of the prestressing space 24 formed so far has a connection point 33 for this purpose.
- the pressure in the preload space 24 can be predetermined.
- the low-pressure fluid chamber 4 is in all the embodiments shown starting from Fig. 2, designed in principle the same way as the high-pressure fluid chamber 5, both of which have comparable storage volumes in the other.
- the desserts tion 8, the pressure means 3 via check valves 16, 1 7 removes the pressure medium tank 9 is arranged in an end wall 34 of the housing 18 of the double piston accumulator 10.
- the end wall 34 is arranged diametrically opposite the end wall 32. Furthermore, the filled with the pressure medium 3 low-pressure fluid space 4 between the piston 7 and the partition wall 20 of the double piston accumulator 10 is arranged. From the low-pressure fluid chamber 4 takes the pressure medium pump 2, the pressure medium 3 and conveys it into the high-pressure fluid chamber 5, wherein the pertinent conveying direction is so far also reversible, so that a flow idströmung in the opposite direction can also be short-term.
- the total volumes of the fluid spaces consisting of biasing space, high-pressure and low-pressure fluid space, as well as the respective rear space to the piston are substantially the same size.
- the make-up device 8 is arranged directly in the dividing wall 20 so that the piston rod side of the piston 7 seals the piston rod 30 of the piston 12 of the piston-cylinder Can press arrangement.
- the check valves 16, 1 7 are integrated in an advantageous manner in the housing wall of the housing 18 or in the partition wall 20 at a suitable location. The same applies to the fluid-carrying connection 15.
- FIGS. 4 and 5 each show schematic longitudinal sections through the
- the working space 13 of the make-up device 8 is in this case arranged in the coupling element 19.
- the working space 13 is designed as an elongate, narrow cylinder or working space 13 running essentially over the entire length of the coupling rod 22.
- the rod-shaped piston 12 protrudes into the working space 13 either from the end wall 34 of the housing part for the low-pressure fluid space 4 or from the end wall 32 of the high-pressure fluid space 5.
- the piston 12 is fixedly arranged in the respective end wall 32, 34, so that the volume of the working space 13 is changed by the displacement movement of the coupling rod 22.
- the piston 12 is designed as a hollow piston 23, wherein a continuous channel leads in the longitudinal direction of the piston 12 from the pressure medium container 9 to the working space 13 and via a coupling rod 22 arranged in the check valve 1 7 in the low-pressure fluid chamber 4.
- Another check valve 16 is provided between the pressure medium tank 9 and the dessert device 8. The check valves 16, 1 7 open depending on the fluid pressure in the same manner as already described above.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Transportation (AREA)
- Analytical Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010023015A DE102010023015B4 (en) | 2010-06-08 | 2010-06-08 | Hydraulic system |
PCT/EP2011/002329 WO2011154075A1 (en) | 2010-06-08 | 2011-05-11 | Hydraulic system |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2580079A1 true EP2580079A1 (en) | 2013-04-17 |
Family
ID=44501680
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11719197.3A Withdrawn EP2580079A1 (en) | 2010-06-08 | 2011-05-11 | Hydraulic system |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2580079A1 (en) |
DE (1) | DE102010023015B4 (en) |
WO (1) | WO2011154075A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
MX2015013076A (en) * | 2013-03-15 | 2016-08-03 | Stored Energy Solutions Inc | Hydraulic hybrid system. |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2286798A (en) * | 1940-05-16 | 1942-06-16 | Hydraulic Dev Corp Inc | Hydraulic circuit for press brakes |
DE3139600A1 (en) * | 1981-10-06 | 1983-04-21 | Gesellschaft für Hydraulik-Zubehör mbH, 6603 Sulzbach | Piston accumulator |
CA2431225C (en) * | 2000-11-28 | 2009-11-17 | Ifield Technology Limited | Hydraulic energy storage systems |
AUPR170400A0 (en) * | 2000-11-28 | 2000-12-21 | Ifield Technology Ltd | Emergency energy release for hydraulic energy storage systems |
US7926501B2 (en) * | 2007-02-07 | 2011-04-19 | National Oilwell Varco L.P. | Subsea pressure systems for fluid recovery |
-
2010
- 2010-06-08 DE DE102010023015A patent/DE102010023015B4/en active Active
-
2011
- 2011-05-11 EP EP11719197.3A patent/EP2580079A1/en not_active Withdrawn
- 2011-05-11 WO PCT/EP2011/002329 patent/WO2011154075A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2011154075A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102010023015B4 (en) | 2012-12-06 |
WO2011154075A1 (en) | 2011-12-15 |
DE102010023015A1 (en) | 2011-12-08 |
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