EP3623621B1 - Pump unit for providing a hydraulic pressure for actuating an actuator in the drive train of a motor vehicle - Google Patents
Pump unit for providing a hydraulic pressure for actuating an actuator in the drive train of a motor vehicle Download PDFInfo
- Publication number
- EP3623621B1 EP3623621B1 EP19195233.2A EP19195233A EP3623621B1 EP 3623621 B1 EP3623621 B1 EP 3623621B1 EP 19195233 A EP19195233 A EP 19195233A EP 3623621 B1 EP3623621 B1 EP 3623621B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump unit
- storage container
- pump
- pressure
- partition
- 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.)
- Active
Links
- 239000012530 fluid Substances 0.000 claims description 23
- 238000005192 partition Methods 0.000 claims description 17
- 239000004020 conductor Substances 0.000 description 19
- 239000012535 impurity Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000012080 ambient air Substances 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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- 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
- F04B23/00—Pumping installations or systems
- F04B23/02—Pumping installations or systems having reservoirs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
-
- 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
- F04B49/10—Other safety measures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
- F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
- F04C2/3446—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along more than one line or surface
- F04C2/3447—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along more than one line or surface the vanes having the form of rollers, slippers or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2210/00—Fluid
- F04C2210/20—Fluid liquid, i.e. incompressible
- F04C2210/206—Oil
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/10—Stators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/30—Casings or housings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/809—Lubricant sump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2210/00—Working fluid
- F05B2210/10—Kind or type
- F05B2210/11—Kind or type liquid, i.e. incompressible
Definitions
- the invention relates to a pump unit for providing a hydraulic pressure for actuating an actuator in the drive train of a motor vehicle, in particular a clutch actuator or gearbox actuator, with a pump, a storage container for hydraulic fluid and two pressure outlets.
- the pump unit serves to provide a hydraulic pressure which is controlled or regulated by activation of the solenoid valve.
- the hydraulic pressure can be used to switch a clutch between an open and a closed position or, in the case of a gearbox actuator, to switch a certain gear stage.
- Each of the two pressure outlets serves to act upon one of two clutches of a dual clutch gearbox.
- the first clutch is then used to switch gear stages, 1, 3, 5 and 7 and the second clutch to switch gear stages 2, 4, 6, 8.
- the storage container is divided into two chambers, wherein a first intake opening of the pump is arranged in one chamber and a second intake opening of the pump is arranged in the other chamber.
- the intake openings are arranged in the vicinity of the base of the corresponding chamber. This reduces the dead volume in the corresponding chamber and correspondingly increases the volume of hydraulic fluid which is available as working volume.
- the storage container In order to divide the storage container into two chambers, use can be made of a substantially horizontally extending partition, wherein the partition has a vertically extending end wall. Alternatively, it can be provided that the storage container is divided by a substantially vertically extending partition into the two chambers. In each case, the profile of the partition can be selected in such a manner that the external dimensions of the storage container meet the corresponding specifications.
- the normal filling level of the storage container lies above the uppermost edge of the end wall or the partition. This ensures that, in the normal state, hydraulic fluids are exchanged between the two circuits. In the event of a minor leakage, the time to failure is thereby also extended since the circuit losing hydraulic fluid initially takes the latter out of the common volume above the uppermost edge of the end wall or the partition.
- the volume which is common to the two circuits and is contained in the storage container is smaller between the uppermost edge of the end wall or the partition and the normal filling level than the sum of the separate volumes which are each formed within each chamber as far as the uppermost edge of the end wall or the partition.
- the storage container is attached directly to the pump housing.
- two solenoid valves are provided with which the fluid pressure at the pressure outlets can be controlled, wherein one of the solenoid valves is arranged in a chamber of the storage container and the other solenoid valve is arranged in the other chamber.
- the figures illustrate a pump unit which serves to provide a hydraulic pressure (and also a hydraulic fluid flow) which can be converted by an actuator in the drive train of a motor vehicle into an actuating stroke.
- the actuating stroke can be used to close or open a clutch, for example, or can be used to switch a gear stage of a gearbox or to bring same into the neutral position.
- the pump unit has a drive motor 1, a pump 2, an electronic control system 3, two solenoid valves 4, two pressure sensors 5, which are accommodated in a common housing, and a storage container 6.
- the central component of the pump unit is a pump housing 7 on which the solenoid valves 4 are mounted and on which the storage container 6 is also mounted.
- the pressure sensors 5 are also mounted on the pump housing 7.
- an electronic housing 8 is mounted on the pump housing 7, said electronic housing firstly accommodating the electronic control system 3 and secondly containing the stator of the electric motor 1.
- a cover 9 is mounted on the electronic housing 8, the cover closing the electronic control system 3 and serving to dissipate the heat lost from the electronic control system 3 to the environment.
- the solenoid valves 2 are arranged within the storage container 6.
- the electric motor 1 is a brushless electric motor with which the pump 2 is driven.
- the pump 2 is a rotary vane pump (see Figure 21 ) which has a rotor 10 with a plurality of chambers 12, in each of which a rotary vane element 14 is arranged.
- the rotary vane elements 14 are cylindrical rollers.
- the pump is therefore a roller vane pump.
- each rotary vane element passes twice through a sequence of intake region A and pressure region D. Accordingly, the pump has two suction connections and two pressure outlets.
- the pump unit likewise has two pressure outlets 20 which are independent of each other.
- the pump is constructed symmetrically by all the components which will be explained below being present for each pressure outlet.
- the solenoid valve is described below, this applies to the two solenoid valves since one is present for each pressure outlet.
- the pump unit has two pressure outlets 20 via which the hydraulic pressure is provided which is produced by the pump unit for actuating the actuator.
- a nonreturn valve 22 is arranged downstream of each pressure outlet D of the pump 2.
- the nonreturn valves 22 have a valve seat made of rubber.
- the inlet 24 of the solenoid valve 4 is located downstream of the outlet of the nonreturn valve 22.
- each of the solenoid valves 4 is activated in such a manner that the desired hydraulic pressure is present at the pressure outlet 20 of the pump unit. Excess hydraulic fluid is conducted back directly into the storage container 6 by a return line 26.
- the solenoid valves 4 are designed as proportional valves and, as valve element, have a ball which, together with the valve seat, ensures that the solenoid valve 4 is free from leakage in the closed state.
- the right side of Figure 7 shows the fluid flow in a state in which hydraulic pressure is not intended to be provided at the right pressure outlet 20.
- FIG. 7 shows the state in which a regulated hydraulic pressure is provided at the pressure outlet 20 of the pump unit.
- the solenoid valve 4 is activated by the electronic control system 3 in such a manner that the actual pressure corresponds to the desired pressure.
- Figure 8 shows the pump unit in a state in which the pump 2 has been stopped.
- the solenoid valve 4 on the right side is open, and therefore the right pressure outlet 20 is free from pressure.
- An essential feature of the concept for keeping impurities away from the pump unit is that no suction-side filters are used; all of the filters are arranged on the pressure side. Accordingly, the pump sucks up directly from the storage container 6.
- a first filter 30 is located downstream of the corresponding pressure outlet of the pump 2. Said filter serves to filter out impurities from the hydraulic fluid before said impurities pass to the solenoid valve 4. Since a large portion of the hydraulic fluid is conducted by the pump 2 to the solenoid valve 4 and from there via the return line 26 to the storage container 6, the two filters 30 ensure that impurities are continuously filtered out from the hydraulic fluid because of the inner circulation of the hydraulic fluid.
- a second filter 32 is provided downstream of the solenoid valve 4, but still upstream of the pressure outlet 20. Said filter prevents impurities from being able to be introduced into the pump unit. Said impurities are in particular original soilings of the lines and of the actuator and abrasion from the actuator, to which the hydraulic fluid is provided by the pump unit.
- the filters 30, 32 are configured to be effective throughout the entire service life of the pump unit without having to be cleaned or replaced.
- they have a cross section of the order of magnitude of 65 mm 2 .
- Their mesh width is of the order of magnitude of 0.1 mm.
- the storage container 6 is provided with a filling filter 34 which is arranged in such a manner that any hydraulic fluid which is filled into the storage container 6 via a filling opening 33 has to flow through the filling filter 34.
- the filling filter 34 has a mesh width of the order of magnitude of 0.3 mm, wherein the material of which said filling filter is composed has a diameter of the order of magnitude of 0.2 mm.
- the filling filter 34 ensures that no impurities are introduced into the storage container 6 from the outside.
- the storage container 6 is divided into two chambers 40, 42, wherein an intake opening 44 leading to the suction connection A of the pump 2 is arranged in each chamber 40, 42.
- a driver after receiving a warning about the failure of the first hydraulic circuit, can still safely drive the vehicle into a parking bay or into a parking space since, for example in the case of a dual clutch gearbox, a clutch and the gearbox switching stages associated therewith are still ready for operation.
- a substantially horizontally extending partition 46 which has a vertically extending end wall 48 (see Figure 10 ), or a substantially vertically extending partition 50 (see Figure 11 ).
- Each chamber 40, 42 has a dead volume T which corresponds to the volume below the corresponding intake opening 44.
- a working volume W is located above the dead volume. Said working volume W is determined by the uppermost edge of the end wall 48 or of the partition 50.
- a common working volume GW is located above the working volumes W.
- the hydraulic circuits are separated from one another whenever the common working volume GW drops to zero and each hydraulic circuit only still sucks up from its own working volume W.
- the solenoid valves 4 are arranged within the storage container 6.
- a solenoid valve is in each case arranged here in a chamber 40, 42.
- Each of the solenoid valves 4 has a housing 60 (see Figure 13 ) which surrounds the components of the solenoid valve 4.
- the solenoid valve 4 has a nonreturn valve 62, a valve seat 64, a valve element 66, an armature 68 and a coil 70.
- the hydraulic fluid flows via an intake 72 (see Figure 14 ) either to the pressure outlet 20 of the pump unit or via the opening cross section between the valve seat 64 and the valve element 66 to the return line 26.
- a particular feature consists in that the route to the return line 26 leads through the interior of the housing 60.
- a corresponding return output 67 of the solenoid valve is symbolized in Figure 14 by the vertically downwardly pointing arrow, the return output beginning behind the valve seat and leading into the space within the housing 60.
- the nonreturn valve 62 which is integrated here in the solenoid valve 4 corresponds to the nonreturn valve 22 shown in Figures 6 to 9 .
- a further particular feature consists in that a bearing gap which is present between the armature 68 and a bearing 76 inserted into the coil 70 and the solenoid valve housing is likewise flushed through with hydraulic fluid.
- a further particular feature of the solenoid valve 4 consists in that it is self-cleaning since the path to the return line 26 removes any particles from the open valve seat and the valve element.
- each conductor element 80 contains three electric conductors which are composed, for example, of spring bronze.
- the conductors 82 are encased, in particular insert moulded, with plastic, such that the conductor element 80 is formed.
- the conductors 82 are bent over by barely 180° on their side facing the pressure sensor 5 such that spring contacts 86 are formed.
- the latter serve to lie in a spring-elastic manner against corresponding connection contacts with the pressure sensors and thereby to produce an electrical contact (see Figure 20 ).
- the pressure sensor 5 is sealed on the side facing away from the conductor element 80 by means of various seals 114.
- the electric conductors 82 are designed as contact pins 88 which can be inserted into a plug on a printed circuit board 90 on which the electronic control system 3 is constructed.
- the conductor element 80 extends from the printed circuit board 90 through a leadthrough 92 in the electronic housing 8 and into a receptacle 94 in the pump housing 7.
- the conductor element 80 is sealed both in relation to the leadthrough 92 and in relation to the receptacle 94.
- two seals 96, 98 are provided which provide a seal within the leadthrough 92, and a seal 100 is provided which provides a seal in relation to the receptacle 94.
- the seals 96, 98, 100 are O rings which are accommodated in corresponding receiving grooves 102, 104, 106 which are provided on the conductor element 80.
- the conductor element 80 is provided with a channel 110 which extends along the longitudinal direction of the conductor element 80, specifically leading from the side which is arranged in the receptacle 94, i.e. the side assigned to the pressure sensors 5, and into a recess 112 between the seals 96 and 98, i.e. within the leadthrough 92.
- the channel 110 serves to check with little outlay whether the two conductor elements 80 are correctly mounted, in particular whether the seals 96, 98, 100 are providing a seal in the desired manner.
- the test takes place by a negative pressure being applied in the region of the pressure sensors. After a short settling time, it can be measured whether the applied negative pressure remains constant or whether the pressure rises.
- the pressure remains constant, this means that all of the seals are providing a seal in the desired manner. If the negative pressure becomes lower, this means that at least one of the seals is not correctly providing a seal. This can either be the seal 96, and therefore air is sucked out of the region of the printed circuit board 90 into the leadthrough 92 and via the recess 112 into the channel 110. It can also mean that the seal 98 is not providing a seal, and therefore ambient air is sucked out of the region between the leadthrough 92 and the receptacle 94 towards the recess 112. Finally, it can mean that the seal 100 is not providing a seal, and therefore ambient air is sucked through the receptacle 94 towards the region of the pressure sensors 5.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Transmission Device (AREA)
- Details Of Reciprocating Pumps (AREA)
- Fluid-Pressure Circuits (AREA)
Description
- The invention relates to a pump unit for providing a hydraulic pressure for actuating an actuator in the drive train of a motor vehicle, in particular a clutch actuator or gearbox actuator, with a pump, a storage container for hydraulic fluid and two pressure outlets.
- The pump unit serves to provide a hydraulic pressure which is controlled or regulated by activation of the solenoid valve. The hydraulic pressure can be used to switch a clutch between an open and a closed position or, in the case of a gearbox actuator, to switch a certain gear stage.
- Each of the two pressure outlets serves to act upon one of two clutches of a dual clutch gearbox. For example, the first clutch is then used to switch gear stages, 1, 3, 5 and 7 and the second clutch to switch
gear stages - It is the object of the invention to increase the operational reliability of the pump unit.
- To achieve this object, in the case of a pump unit of the type mentioned at the beginning, according to the invention which is defined by the appended claims, the storage container is divided into two chambers, wherein a first intake opening of the pump is arranged in one chamber and a second intake opening of the pump is arranged in the other chamber. This ensures that, in the event of a hydraulic leakage in one circuit, only this circuit runs dry and therefore fails, while the other circuit remains operationally ready as before. This makes it possible for the driver of the vehicle to continue to operate the vehicle in a limited manner, namely just with either the even or the odd gear stages. At any rate, the vehicle can therefore be driven, for example, into a parking bay, from a busy street onto the pavement or even home or to a garage.
- It is preferably provided that the intake openings are arranged in the vicinity of the base of the corresponding chamber. This reduces the dead volume in the corresponding chamber and correspondingly increases the volume of hydraulic fluid which is available as working volume.
- In order to divide the storage container into two chambers, use can be made of a substantially horizontally extending partition, wherein the partition has a vertically extending end wall. Alternatively, it can be provided that the storage container is divided by a substantially vertically extending partition into the two chambers. In each case, the profile of the partition can be selected in such a manner that the external dimensions of the storage container meet the corresponding specifications.
- According to a preferred embodiment, the normal filling level of the storage container lies above the uppermost edge of the end wall or the partition. This ensures that, in the normal state, hydraulic fluids are exchanged between the two circuits. In the event of a minor leakage, the time to failure is thereby also extended since the circuit losing hydraulic fluid initially takes the latter out of the common volume above the uppermost edge of the end wall or the partition.
- So that the storage container can be configured compactly, the volume which is common to the two circuits and is contained in the storage container is smaller between the uppermost edge of the end wall or the partition and the normal filling level than the sum of the separate volumes which are each formed within each chamber as far as the uppermost edge of the end wall or the partition.
- In order to ensure short intake paths for the pump, the storage container is attached directly to the pump housing.
- According to a preferred embodiment of the invention, two solenoid valves are provided with which the fluid pressure at the pressure outlets can be controlled, wherein one of the solenoid valves is arranged in a chamber of the storage container and the other solenoid valve is arranged in the other chamber. This has the advantage that the two solenoid valves can be cooled directly by the hydraulic fluid. Furthermore, they are protected against environmental influences and corrosion. If the hydraulic fluid also surrounds the armature of the solenoid valve, a constant damping behaviour is ensured.
- The invention will be described below with reference to an embodiment which is illustrated in the attached drawings. In the latter:
-
Figure 1 shows a pump unit in a perspective view; -
Figure 2 shows the pump unit fromFigure 1 in a perspective exploded view; -
Figure 3 shows the pump unit fromFigure 1 in a side view; -
Figure 4 shows the pump unit fromFigure 3 in a first sectional view; -
Figure 5 shows the pump unit fromFigure 3 in a second sectional view; -
Figure 6 shows a hydraulic circuit diagram of the pump unit; -
Figure 7 shows the circuit diagram fromFigure 6 , wherein the hydraulic flow is shown for two different operating states; -
Figure 8 shows the circuit diagram fromFigure 6 , wherein a further operating state is shown; -
Figure 9 shows the circuit diagram fromFigure 6 , wherein the filters used in the pump unit are added; -
Figure 10 shows a side view of a storage container which is used in the pump unit; -
Figure 11 shows a partial view of an alternative configuration of the storage container; -
Figure 12 shows a schematic illustration of the various volumes within the storage container; -
Figure 13 shows a sectional view of a solenoid valve used in the pump unit; -
Figure 14 shows the solenoid valve fromFigure 13 , wherein the fluid flows during operation have been drawn in; -
Figure 15 shows a sectional view through the pump unit, wherein a conductor element is shown which is used for transmitting signals between pressure sensors and a printed circuit board; -
Figure 16 shows the conductor element fromFigure 15 in a perspective view; -
Figure 17 shows the conductor element fromFigure 16 in a longitudinal section; -
Figure 18 shows the conductor element fromFigure 16 in a cross section; -
Figure 19 shows a variant embodiment of the conductor element; -
Figure 20 shows a detail of the contact connection of the pressure sensor; -
Figure 21 shows a cross section through the pump of the pump unit. - The figures illustrate a pump unit which serves to provide a hydraulic pressure (and also a hydraulic fluid flow) which can be converted by an actuator in the drive train of a motor vehicle into an actuating stroke. The actuating stroke can be used to close or open a clutch, for example, or can be used to switch a gear stage of a gearbox or to bring same into the neutral position.
- As essential components (see in particular
Figures 1 and2 ), the pump unit has adrive motor 1, apump 2, anelectronic control system 3, twosolenoid valves 4, twopressure sensors 5, which are accommodated in a common housing, and astorage container 6. - The central component of the pump unit is a
pump housing 7 on which thesolenoid valves 4 are mounted and on which thestorage container 6 is also mounted. Thepressure sensors 5 are also mounted on thepump housing 7. - On the side opposite the
storage container 6, anelectronic housing 8 is mounted on thepump housing 7, said electronic housing firstly accommodating theelectronic control system 3 and secondly containing the stator of theelectric motor 1. A cover 9 is mounted on theelectronic housing 8, the cover closing theelectronic control system 3 and serving to dissipate the heat lost from theelectronic control system 3 to the environment. - As can be seen in
Figures 4 and5 , thesolenoid valves 2 are arranged within thestorage container 6. - The
electric motor 1 is a brushless electric motor with which thepump 2 is driven. - The
pump 2 is a rotary vane pump (seeFigure 21 ) which has arotor 10 with a plurality of chambers 12, in each of which arotary vane element 14 is arranged. Therotary vane elements 14 are cylindrical rollers. The pump is therefore a roller vane pump. - The cylindrical rollers roll on the inner contour of a
stator 16 which defines a volume which is variable in the circumferential direction. Accordingly, during rotation of therotor 10 by 360°, each rotary vane element passes twice through a sequence of intake region A and pressure region D. Accordingly, the pump has two suction connections and two pressure outlets. - Owing to the two independent pressure outlets D of the
pump 2, the pump unit likewise has twopressure outlets 20 which are independent of each other. - The pump is constructed symmetrically by all the components which will be explained below being present for each pressure outlet. Thus when, for example, "the" solenoid valve is described below, this applies to the two solenoid valves since one is present for each pressure outlet.
- The basic operation of the pump unit will now be explained with reference to
Figures 6 to 8 . - The pump unit has two
pressure outlets 20 via which the hydraulic pressure is provided which is produced by the pump unit for actuating the actuator. - A
nonreturn valve 22 is arranged downstream of each pressure outlet D of thepump 2. Thenonreturn valves 22 have a valve seat made of rubber.
Theinlet 24 of thesolenoid valve 4 is located downstream of the outlet of thenonreturn valve 22. Depending on the desired pressure and the actual pressure measured at thepressure sensor 5, each of thesolenoid valves 4 is activated in such a manner that the desired hydraulic pressure is present at thepressure outlet 20 of the pump unit. Excess hydraulic fluid is conducted back directly into thestorage container 6 by areturn line 26. - The
solenoid valves 4 are designed as proportional valves and, as valve element, have a ball which, together with the valve seat, ensures that thesolenoid valve 4 is free from leakage in the closed state. - The right side of
Figure 7 shows the fluid flow in a state in which hydraulic pressure is not intended to be provided at theright pressure outlet 20. - All of the hydraulic fluid is pumped back from the pressure outlet D of the
pump 2 in thesolenoid valve 4 via thereturn line 26 into thestorage container 6; the pump therefore operates in a circuit. - The left side of
Figure 7 shows the state in which a regulated hydraulic pressure is provided at thepressure outlet 20 of the pump unit. In this case, thesolenoid valve 4 is activated by theelectronic control system 3 in such a manner that the actual pressure corresponds to the desired pressure. -
Figure 8 shows the pump unit in a state in which thepump 2 has been stopped. Thesolenoid valve 4 on the right side is open, and therefore theright pressure outlet 20 is free from pressure. - By contrast, the
left pressure outlet 20 is shut off since thesolenoid valve 4 is completely closed. A hydraulic pressure built up downstream of thepressure outlet 20 will therefore be maintained even if thepump 2 is not operated further. - The filters which are used within the pump unit will now be explained with reference to
Figure 9 . - An essential feature of the concept for keeping impurities away from the pump unit is that no suction-side filters are used; all of the filters are arranged on the pressure side. Accordingly, the pump sucks up directly from the
storage container 6. - A
first filter 30 is located downstream of the corresponding pressure outlet of thepump 2. Said filter serves to filter out impurities from the hydraulic fluid before said impurities pass to thesolenoid valve 4. Since a large portion of the hydraulic fluid is conducted by thepump 2 to thesolenoid valve 4 and from there via thereturn line 26 to thestorage container 6, the twofilters 30 ensure that impurities are continuously filtered out from the hydraulic fluid because of the inner circulation of the hydraulic fluid. - A
second filter 32 is provided downstream of thesolenoid valve 4, but still upstream of thepressure outlet 20. Said filter prevents impurities from being able to be introduced into the pump unit. Said impurities are in particular original soilings of the lines and of the actuator and abrasion from the actuator, to which the hydraulic fluid is provided by the pump unit. - The
filters - In the exemplary embodiment described, they have a cross section of the order of magnitude of 65 mm2. Their mesh width is of the order of magnitude of 0.1 mm.
- The
storage container 6 is provided with a fillingfilter 34 which is arranged in such a manner that any hydraulic fluid which is filled into thestorage container 6 via a fillingopening 33 has to flow through the fillingfilter 34. - In the described exemplary embodiment, the filling
filter 34 has a mesh width of the order of magnitude of 0.3 mm, wherein the material of which said filling filter is composed has a diameter of the order of magnitude of 0.2 mm. The fillingfilter 34 ensures that no impurities are introduced into thestorage container 6 from the outside. - The
storage container 6 is divided into twochambers intake opening 44 leading to the suction connection A of thepump 2 is arranged in eachchamber storage container 6 into twoseparate chambers - Thus, for example, a driver, after receiving a warning about the failure of the first hydraulic circuit, can still safely drive the vehicle into a parking bay or into a parking space since, for example in the case of a dual clutch gearbox, a clutch and the gearbox switching stages associated therewith are still ready for operation.
- In order to divide the
storage container 6 into the twochambers partition 46 which has a vertically extending end wall 48 (seeFigure 10 ), or a substantially vertically extending partition 50 (seeFigure 11 ). - Each
chamber intake opening 44. A working volume W is located above the dead volume. Said working volume W is determined by the uppermost edge of theend wall 48 or of thepartition 50. A common working volume GW is located above the working volumes W. - The hydraulic circuits are separated from one another whenever the common working volume GW drops to zero and each hydraulic circuit only still sucks up from its own working volume W.
- As is known from
Figures 2 ,4 and5 , thesolenoid valves 4 are arranged within thestorage container 6. A solenoid valve is in each case arranged here in achamber - Each of the
solenoid valves 4 has a housing 60 (seeFigure 13 ) which surrounds the components of thesolenoid valve 4. - The
solenoid valve 4 has anonreturn valve 62, avalve seat 64, avalve element 66, anarmature 68 and acoil 70. The hydraulic fluid flows via an intake 72 (seeFigure 14 ) either to thepressure outlet 20 of the pump unit or via the opening cross section between thevalve seat 64 and thevalve element 66 to thereturn line 26. - A particular feature consists in that the route to the
return line 26 leads through the interior of thehousing 60. Acorresponding return output 67 of the solenoid valve is symbolized inFigure 14 by the vertically downwardly pointing arrow, the return output beginning behind the valve seat and leading into the space within thehousing 60. - By means of this arrangement of the return output of the
solenoid valve 4, an encircling, in particular annular,free space 74 which is present between thehousing 60 and thecoil 70 is flushed through with hydraulic fluid. - The
nonreturn valve 62 which is integrated here in thesolenoid valve 4 corresponds to thenonreturn valve 22 shown inFigures 6 to 9 . - A further particular feature consists in that a bearing gap which is present between the
armature 68 and abearing 76 inserted into thecoil 70 and the solenoid valve housing is likewise flushed through with hydraulic fluid. - A further particular feature of the
solenoid valve 4 consists in that it is self-cleaning since the path to thereturn line 26 removes any particles from the open valve seat and the valve element. - It will now be explained with reference to
Figures 15 to 20 how thepressure sensors 5 are connected to theelectronic control system 3. - While, in the embodiment of
Figures 1 and2 , a cable is still used for this purpose, in the case of the configuration according toFigures 15 to 20 two inherentlystable conductor elements 80 are used. Eachconductor element 80 contains three electric conductors which are composed, for example, of spring bronze. Theconductors 82 are encased, in particular insert moulded, with plastic, such that theconductor element 80 is formed. - The
conductors 82 are bent over by barely 180° on their side facing thepressure sensor 5 such thatspring contacts 86 are formed. The latter serve to lie in a spring-elastic manner against corresponding connection contacts with the pressure sensors and thereby to produce an electrical contact (seeFigure 20 ). - The
pressure sensor 5 is sealed on the side facing away from theconductor element 80 by means ofvarious seals 114. - At the opposite end, the
electric conductors 82 are designed as contact pins 88 which can be inserted into a plug on a printedcircuit board 90 on which theelectronic control system 3 is constructed. - The
conductor element 80 extends from the printedcircuit board 90 through a leadthrough 92 in theelectronic housing 8 and into areceptacle 94 in thepump housing 7. Theconductor element 80 is sealed both in relation to the leadthrough 92 and in relation to thereceptacle 94. For this purpose, twoseals leadthrough 92, and aseal 100 is provided which provides a seal in relation to thereceptacle 94. - The
seals grooves conductor element 80. - In the variant embodiment shown in
Figure 19 , a total of four receptacles for seals are used. - The
conductor element 80 is provided with achannel 110 which extends along the longitudinal direction of theconductor element 80, specifically leading from the side which is arranged in thereceptacle 94, i.e. the side assigned to thepressure sensors 5, and into arecess 112 between theseals leadthrough 92. - The
channel 110 serves to check with little outlay whether the twoconductor elements 80 are correctly mounted, in particular whether theseals - The test takes place by a negative pressure being applied in the region of the pressure sensors. After a short settling time, it can be measured whether the applied negative pressure remains constant or whether the pressure rises.
- If the pressure remains constant, this means that all of the seals are providing a seal in the desired manner. If the negative pressure becomes lower, this means that at least one of the seals is not correctly providing a seal. This can either be the
seal 96, and therefore air is sucked out of the region of the printedcircuit board 90 into theleadthrough 92 and via therecess 112 into thechannel 110. It can also mean that theseal 98 is not providing a seal, and therefore ambient air is sucked out of the region between the leadthrough 92 and thereceptacle 94 towards therecess 112. Finally, it can mean that theseal 100 is not providing a seal, and therefore ambient air is sucked through thereceptacle 94 towards the region of thepressure sensors 5.
Claims (7)
- Pump unit for providing a hydraulic pressure for actuating an actuator in the drive train of a motor vehicle, in particular a clutch actuator or gearbox actuator, with a pump (2), a storage container (6) for hydraulic fluid and two pressure outlets (20), characterized in that the storage container (6) is attached directly to a pump housing (7) and in that the storage container (6) is divided into two chambers (40, 42), wherein a first intake opening (44) of the pump (2) is arranged in one chamber (40) and a second intake opening (44) of the pump (2) is arranged in the other chamber (42).
- Pump unit according to Claim 1, characterized in that the intake openings (44) are arranged in the vicinity of the base of the corresponding chamber (40, 42).
- Pump unit according to Claim 1 or 2, characterized in that the storage container (6) is divided by a substantially horizontally extending partition (46) into the two chambers (40, 42), wherein the partition (46) has a vertically extending end wall (48).
- Pump unit according to Claim 1 or Claim 2, characterized in that the storage container (6) is divided by a substantially vertically extending partition (50) into the two chambers (40, 42).
- Pump unit according to either of Claims 3 and 4, characterized in that the normal filling level of the storage container (6) lies above the uppermost edge of the end wall (48) or the partition (50).
- Pump unit according to Claim 5, characterized in that the volume (GW) which is common to the two circuits and is contained in the storage container (6) is smaller between the uppermose edge of the end wall (48) or the partition (50) and the normal filling level than the sum of the separate volumes (W, T) which are each formed within each chamber (40, 42) as far as the uppermost edge of the end wall (48) or the partition (50).
- Pump unit according to one of the preceding claims, characterized in that two solenoid valves (4) are provided with which the fluid pressure at the pressure outlets (20) can be controlled, wherein one of the solenoid valves (4) is arranged in a chamber (40) of the storage container (6) and the other solenoid valve (4) is arranged in the other chamber (42).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018122306.4A DE102018122306A1 (en) | 2018-09-12 | 2018-09-12 | Pump unit for providing a hydraulic pressure for actuating an actuator in the drive train of a motor vehicle |
Publications (2)
Publication Number | Publication Date |
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EP3623621A1 EP3623621A1 (en) | 2020-03-18 |
EP3623621B1 true EP3623621B1 (en) | 2023-08-23 |
Family
ID=67850971
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP19195233.2A Active EP3623621B1 (en) | 2018-09-12 | 2019-09-03 | Pump unit for providing a hydraulic pressure for actuating an actuator in the drive train of a motor vehicle |
Country Status (4)
Country | Link |
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EP (1) | EP3623621B1 (en) |
KR (1) | KR102613039B1 (en) |
CN (1) | CN110894832B (en) |
DE (1) | DE102018122306A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102020122260A1 (en) | 2020-08-26 | 2022-03-03 | Fte Automotive Gmbh | Pump unit, in particular for a gear in the drive train of a motor vehicle |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE112016004499T5 (en) * | 2015-09-30 | 2018-06-14 | Hitachi Automotive Systems, Ltd. | HYDRAULIC CONTROL DEVICE AND BRAKING SYSTEM |
Family Cites Families (13)
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DE2252236A1 (en) * | 1972-10-25 | 1974-05-02 | Langen & Co | PISTON PUMP EQUIPPED WITH IN PAIRS OF PISTONS ARRANGED INTO OPERATIONS |
GB8427354D0 (en) * | 1984-10-30 | 1984-12-05 | Hobourn Eaton Ltd | Rotary pumps |
IT1187903B (en) * | 1986-02-11 | 1987-12-23 | Weber Spa | THREE-WAY ELECTROMAGNETIC CONTROL VALVE FOR A HYDRAULIC CIRCUIT |
JP2531471Y2 (en) * | 1990-06-14 | 1997-04-02 | 株式会社ショーワ | Hydraulic pump device |
US6098403A (en) * | 1999-03-17 | 2000-08-08 | Husco International, Inc. | Hydraulic control valve system with pressure compensator |
DE102011105648A1 (en) * | 2011-06-07 | 2012-12-13 | Fte Automotive Gmbh | Hydraulic actuator for the actuation of clutches in particular a multi-clutch transmission for motor vehicles |
EP2729701B1 (en) * | 2011-07-06 | 2016-08-31 | Sensile Pat AG | Liquid dispensing system |
JP5755113B2 (en) * | 2011-11-25 | 2015-07-29 | 日立オートモティブシステムズ株式会社 | Pump device |
DE102012010172A1 (en) * | 2012-05-15 | 2013-11-21 | Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg | Actuator assembly for a motor vehicle powertrain |
US9500206B2 (en) * | 2013-11-18 | 2016-11-22 | Warner Electric Technology Llc | Fluid pump for a linear actuator |
KR101610197B1 (en) * | 2014-11-18 | 2016-04-08 | 주식회사 프로텍 | Piezo-Pneumatic Valve Driving Type Dispensing Pump and Method for Dispensing Viscous Liquid Using the Same |
JP6761776B2 (en) * | 2017-04-25 | 2020-09-30 | 日立オートモティブシステムズ株式会社 | Brake device |
CN113490812B (en) * | 2019-03-06 | 2022-11-18 | 瓦锡兰芬兰有限公司 | Pump module and piston engine |
-
2018
- 2018-09-12 DE DE102018122306.4A patent/DE102018122306A1/en active Pending
-
2019
- 2019-08-29 CN CN201910806534.6A patent/CN110894832B/en active Active
- 2019-09-03 EP EP19195233.2A patent/EP3623621B1/en active Active
- 2019-09-06 KR KR1020190111023A patent/KR102613039B1/en active IP Right Grant
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE112016004499T5 (en) * | 2015-09-30 | 2018-06-14 | Hitachi Automotive Systems, Ltd. | HYDRAULIC CONTROL DEVICE AND BRAKING SYSTEM |
Also Published As
Publication number | Publication date |
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CN110894832B (en) | 2023-06-16 |
EP3623621A1 (en) | 2020-03-18 |
DE102018122306A1 (en) | 2020-03-12 |
KR20200030460A (en) | 2020-03-20 |
CN110894832A (en) | 2020-03-20 |
KR102613039B1 (en) | 2023-12-15 |
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