• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Hydraulic circuit having at least one hydraulic power machine (2, 4) connected to a low pressure circuit (6) and to a high pressure circuit (10) transmitting this power, the machine being equipped with a drain which allows a flow of internal leakage in its housing to a low pressure accumulator (8) or a tank at atmospheric pressure, this circuit comprising an inlet conduit (30) connecting the low pressure circuit (6) to the housing of the machine, and a outlet duct (36) forming the drain receiving the flow of the inlet duct to the reservoir (8), comprising a heat exchanger (42) and a filter (44) forming the fluid treatment elements for the entire hydraulic circuit, this circuit further comprising flow control means (40) in the inlet and outlet ducts.
    公开号:FR3029587A1
    申请号:FR1461895
    申请日:2014-12-04
    公开日:2016-06-10
    发明作者:Dren Arnaud Le；Andres Yarce
    申请人:Technoboost SAS；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a hydraulic circuit, in particular for the traction of a hybrid motor vehicle, a method for controlling the flow of a hybrid motor vehicle, a method for controlling the flow of a hybrid motor vehicle, a method for controlling this hydraulic circuit, and a hybrid motor vehicle comprising such a hydraulic circuit. A known type of transmission for a hydraulic hybrid motor vehicle, presented in particular by the document FR-A1-2973302 comprises a planetary gear comprising three elements connected to a heat engine, a hydraulic pump and a differential driving the drive wheels. The transmission receives a hydraulic machine that can work in motor or pump, which can be connected to the differential by several gear ratios. The hydraulic circuit comprises a low pressure circuit and a high pressure circuit each comprising a pressure accumulator which stores energy, the low pressure accumulator maintaining a minimum pressure threshold to prevent cavitation of the machines. The stored pressurized fluids are then returned to apply engine torque to the wheels. Alternatively the low pressure circuit may include a booster pump that maintains a minimum level of pressure. Different modes of operation are thus obtained comprising a traction of the vehicle solely by the hydraulic machine, the thermal engine being stopped, and a traction by the heat engine which delivers by the sun gear a torque at a time on the differential, and on the pump. providing hydraulic power. In the latter mode can be added a complementary traction torque given by the hydraulic machine.
    [0002] A "short ratio" mode is also obtained with the pump stopped, the heat engine delivering a high torque on the drive wheels by the planetary gear train forming a speed reducer, and a "long ratio" mode with the heat engine delivering a lower torque on the drive wheels by the planetary gear that is stuck. In addition, a "braking" mode is obtained in which the hydraulic machine working as a pump delivers a braking torque to the vehicle by reloading the high pressure accumulator. In addition, the hydraulic power machines generate during the operation of the calories produced by the internal losses, causing a heating of the fluid. There is generally a heat exchanger on the main flow of fluid delivering the power to the different hydraulic machines. This arrangement requires a heat exchanger with sufficiently large dimensions to limit the pressure drop on a high flow, resulting in a large space and a large mass, while on vehicles we want to reduce these parameters to reduce the consumption of energy. energy. In addition, the cost of this large filter is also high. In addition one can have a problem of internal pollution of the circuit, in particular hydraulic machines, coming from materials introduced into the circuit during its manufacture, or particles generated by the wear of the internal components. This pollution causes faster aging of the organs, and can cause failures. In order to eliminate the impurities from the fluid, a filter is generally also available in the main flow of power of the hydraulic circuit, which necessarily comprises a single direction of passage of this fluid. However, in the case of a circuit comprising hydraulic machines working in rotation in both directions, as for the transmission of the hybrid vehicle presented by the above-mentioned prior art document, the one-way passage through the filter may require components that straighten this direction, including an arrangement of several check valves, which adds bulk, weight and costs.
    [0003] In addition, the filter generally mounted on the main flow of the hydraulic circuit must have a large dimension to prevent excessive pressure drop on this flow rate which can be high. The present invention is intended to avoid these disadvantages of the prior art. It proposes for this purpose a hydraulic circuit having at least one hydraulic power machine connected to a low pressure circuit and a high pressure circuit transmitting this power, the machine being equipped with a drain which allows a flow of internal leaks in its housing towards a low pressure accumulator or a tank at atmospheric pressure, characterized in that it comprises an inlet duct connecting the low pressure circuit to the casing of the machine, and an outlet duct forming the drain receiving the flow rate the inlet duct for conducting it to the tank, comprising a heat exchanger and a filter forming the fluid treatment elements for the entire hydraulic circuit, this circuit further comprising flow control means in the inlet ducts and output. An advantage of this hydraulic circuit is that with the means of controlling the flow of the drain passing through the inlet and outlet ducts, it is possible to impose and control a sufficient flow of fluid, independent of the main power flow, which passes through the casing of the hydraulic machine to both cool and sweep the inside of this machine, as well as to treat the entire fluid of the hydraulic circuit including cooling and filtration.
    [0004] This provides a drain loop having a small flow relative to the main flow of power, simultaneously achieving several functions including the drainage of the internal cavities of the hydraulic machines, and the treatment of the entire fluid of the hydraulic circuit, which allows to have a minimum number of components of reduced dimensions thanks to the low flow through them.
    [0005] The hydraulic circuit according to the invention may further comprise one or more of the following features, which may be combined with each other. According to one embodiment, the low pressure circuit comprising a low pressure accumulator, the flow control means comprises a motorized pump disposed on the outlet duct, which discharges into this accumulator. In this case, the inlet duct advantageously has an inlet check valve preventing backflow to the low pressure circuit, which may comprise a setting spring. Advantageously, the inlet nonreturn valve comprises a closed position in both directions, which can be controlled. Advantageously, the hydraulic circuit comprises between the hydraulic machines and the motor pump, an outward outlet closed by a valve, allowing deaeration of the fluid. Alternatively, the hydraulic circuit may comprise an intermediate tank at atmospheric pressure, arranged between the hydraulic machines and the motor pump. The invention also relates to a method for controlling a hydraulic circuit 20 comprising a motorized pump as a means for controlling the flow rate of a drainage loop, which advantageously detects clogging of the filter by measuring the operating characteristics of this pump. motorized. According to another embodiment, the low pressure circuit 25 having a tank at atmospheric pressure, the flow control means comprises a controlled valve disposed on the inlet duct. Advantageously, the controlled valve comprises a free passage position, and a position equipped with a non-return valve blocking the passage to the hydraulic machines.
    [0006] Advantageously, the outlet duct includes an outlet check valve disposed at the outlet of the hydraulic machines, which blocks a return to these machines. In particular, the hydraulic circuit may comprise a plurality of hydraulic machines each fed by an independent inlet duct coming directly from the low pressure circuit. The invention furthermore relates to a hybrid motor vehicle having a power train using hydraulic energy, the vehicle having a hydraulic circuit comprising any one of the preceding features. The invention will be better understood and other features and advantages will emerge more clearly on reading the following description given by way of example, with reference to the accompanying drawings, in which: FIGS. 1 to 4 show a hydraulic circuit comprising two hydraulic machines equipped with drains connected in series, produced according to the invention; and FIGS. 5 and 6 show hydraulic circuit variants comprising two hydraulic machines equipped with drains mounted in parallel.
    [0007] In general, the hydraulic power machines comprise, in a known manner, a drain connected to the casing in a low pressure zone, which makes it possible to recover a leakage flow coming in particular from the high pressure zone, to evacuate it to a low pressure zone. tank with lower pressure. Generally, the drain comprises a variable flow rate of fluid which is uncontrolled, depending in particular on the pressure difference generating the internal leakage. FIG. 1 shows a hydraulic circuit of a hybrid vehicle comprising a first 2 and a second hydraulic machine 4 linked to a transmission of the vehicle, which are connected to the same low pressure circuit 6 comprising a low pressure accumulator 8.
    [0008] In particular, for the usual operating modes of the hybrid vehicle, the first hydraulic machine 2 operates as a motor and the second machine 4 is pumped, this first machine receiving the pressurized fluid from the high pressure reservoir 12, or directly from the second 5 machine. However, for particular modes, such as vehicle braking or maximum acceleration, these two machines 2, 4 can also work in reverse. The first hydraulic machine 2 is connected directly to a high-pressure circuit 10, which supplies a high-pressure accumulator 12 via two serially arranged valves 14, 16 each comprising in one position a non-return valve mounted in opposition. relative to each other, to control the input and output rates in this accumulator, and to ensure safety. The second hydraulic machine 4 is connected to the high pressure circuit 15 10 via a valve 18, comprising in a position a non-return valve allowing only a passage to this high pressure circuit. This second hydraulic machine 4 receives in parallel a non-return bypass valve 20, which allows a free passage of the fluid to the high pressure circuit 10.
    [0009] The hydraulic circuit comprises two solenoid valves 22 receiving the fluid from the high pressure circuit 10, each supplying the control of one of the hydraulic machines 2, 4. The low pressure circuit 6 comprises a supply duct 30 supplying the casing of the first machine 2, comprising an inlet check valve 32 which prevents a return to this low pressure circuit. An intermediate duct 34 then connects the casings of the two hydraulic machines, to feed the second machine 4 from the first 2 receiving the flow of the supply duct 30.
    [0010] Optionally the inlet check valve 32 may have a setting spring which imposes a pressure drop at the outlet of this valve, so as to ensure a drain pressure in the housings of the hydraulic machines 2, 4, which is lower than that in the low pressure circuit 6. An outlet duct 36 receives the flow through the casing of the second machine 4, to pass successively through an outlet check valve 38 allowing only one passage in this direction, then by an electric motor pump 40 which delivers this flow successively into a heat exchanger 42, then into a filter 44 opening into the low pressure circuit 6 to close a drain loop indicated by the fluid circulation arrows.
    [0011] The outlet check valve 38 makes it possible to protect the integrity of the hydraulic machines 2, 4, by preventing a backflow of fluid coming from the drain towards the casing of these machines. In particular, in the event of an incident on the fluid treatment system, caused for example by an accident of the vehicle which pierces the heat exchanger disposed at the front of this vehicle, next to the radiator of the heat engine, it avoids a fluid rise that can contain particles, to hydraulic machines that are fragile and expensive components. The heat exchanger 42 may in particular transmit its calories to a cooling water circuit, or to an outside air flow. It will be noted that the drain loop starts with the first hydraulic machine 2 generally working as a motor and which can heat up more than the second 4, which favors its cooling. The motorized pump 40 constitutes a means of controlling the flow forming a sweep. in the crankcase of the two machines 2, 4, which fills the drainage function of these housings, as well as cooling the internal parts, and rinsing these parts to take impurities that would be in it. The motor pump 40 must overcome the pressure drops coming from the crossing of the housings of the hydraulic machines 2, 4 and the fluid treatment elements, to effect the circulation.
    [0012] By adjusting the speed of the motor pump 40, the flow rate, which is the same in the two housings, can be adjusted according to the temperature of the hydraulic machines 2, 4 which can be measured directly, or estimated according to operation of this pump causing a typical heating, including flow and pressure, to effect a regulation of this temperature. It will be noted that the flow rate of the drain loop passes in the same direction in the filter 44, without using a component to rectify this flow. Note also that this flow is low compared to the main flow 10 through the hydraulic machines 2, 4 and delivering the power. The exchanger 42 and the filter 44 work with a controlled flow rate controlled by the motor pump 40, reduced with respect to the main flow, which allows with smaller treatment elements to reduce the power losses in this fluid treatment compared to a main flow treatment. In particular, it is possible for an application on a hybrid vehicle presented by the document of the prior art, comprising a main flow rate in the hydraulic machines which is of the order of 100 I / min, a flow rate of the drain loop of the order of 10I / min. The flow in this drain loop is thus optimized according to its own needs. In particular the motorized pump 40 can be used to detect clogging of the filter 44, by measuring its power consumed or its outlet pressure, which then makes it possible to avoid mounting a by-pass valve in parallel with this filter.
    [0013] In addition there is provided on the input of the motorized pump 40 forming a point of the low-pressure circuit, an outward outlet closed by a purge means 46 forming a closure device, allowing deaeration and purging of the fluid. crossing the drain loop. Advantageously, a purge means 46 comprising a float detecting the presence of air, the movement of this float caused by the presence of air automatically opening the outlet to let out this air.
    [0014] It is also possible by the same purge means 46 to fill the circuit facilitated by the low pressure at this point. Optionally the inlet check valve 32 may comprise a command to completely close the passage of the inlet duct 30. It was then by activating the motor pump 40, the generation of a strong depression upstream of this a pump which facilitates the degassing of the fluid in this zone, and its evacuation by the purge means 46. In addition, the vacuum upstream of the motor pump 40 can cause a partial vacuum of the housings of the hydraulic machines 2, 4, which limits the mixing of the fluid contained in it and improves the yield. In addition there may be an additional non-return valve bypass or "shunt" of the motor pump 40, arranged in parallel with this pump, comprising a free passage from upstream to downstream, which still gives a flow in the drain loop with the pump stopped if the pressure difference naturally allows it. A similar operation of this circuit is obtained with a free passage of the fluid towards the parallel output of the motorized pump 40, if for example the housings of the hydraulic machines 2, 4 generate a larger flow rate than that absorbed by this pump.
    [0015] FIG. 2 shows a similar hydraulic circuit comprising a small intermediate tank at atmospheric pressure 48 disposed at the outlet of the second hydraulic machine 4, after the outlet check valve 38. The motorized pump 40 then draws the fluid into the reservoir intermediate 48, to make it pass through the heat exchanger 42 and the filter 44, and output a sufficient pressure to recharge the low pressure accumulator 8. Figure 3 shows a hydraulic circuit comprising a low pressure circuit not comprising accumulator, and an outlet of the drain loop which opens into a tank at atmospheric pressure 50. A booster pump 52 draws fluid into the tank 50, to supply the low pressure circuit 6 by generating the pressure sufficient to that.
    [0016] The inlet duct 30 of the drain loop comprises an inlet controlled valve 54 comprising in a first position a free passage in both directions, and in a second position a nonreturn valve allowing a free passage. flow from the housing of the first machine 5 2 to the low pressure circuit 6 upstream to avoid overpressure in this housing. The inlet controlled valve 54 controlling the flow rate of the drain loop may be a solenoid valve operating at all, possibly leaking when closed to allow a minimum flow rate, or a proportional solenoid valve. We can also use a mechanical regulator type contactor-breaker, which operates automatically by pressure difference. The outlet duct 36 coming from the second hydraulic machine 4 comprises successively in series the outlet nonreturn valve 38, the heat exchanger 42 and the filter 44. There is no motorized pump on this duct. output 36. A natural flow rate in the drain loop is obtained using the pressure generated by the booster pump 52 in the low pressure circuit 6, which is controlled by the controlled valve 54 by oscillating between its two positions.
    [0017] It will be noted that for this hydraulic circuit, the deaeration as well as the purging of the fluid are done automatically by the passage of this fluid leaving the drain loop, in the tank at atmospheric pressure 50. FIG. 4 shows a hydraulic circuit equipped with a tank at atmospheric pressure 50, comprising on the outlet duct 36 of the drain loop, in parallel with the filter 44, a by-pass valve 60 equipped with a setting spring. In the case where the filter 44 is clogged, with a pressure difference at the inlet of this filter greater than the calibration pressure of the bypass valve 60, an automatic passage of the fluid of the drain loop by this valve bypass.
    [0018] FIG. 5 shows a hydraulic circuit equipped with a low-pressure accumulator 8 on the low-pressure circuit 6, comprising for each hydraulic machine 2, 4 a particular inlet duct 30, each having its non-return valve of 32, which feeds individually its housing from the low pressure circuit 6. The two outlet ducts 36a, 36b specific to each hydraulic machine 2, 4, meet in a single outlet duct 36 comprising successively the motor pump 40 equipped with an additional non-return bypass valve 56 arranged in parallel with this pump, then the heat exchanger 42 and the filter 44. In this circuit there is no outlet check valve, which can be complemented. For each hydraulic machine 2, 4 is obtained a supply of the housing from the low pressure circuit 6, which gives them a flow directly from the fluid treatment elements. We then have the same quality of temperature and purity of the fluid supplying these machines. FIG. 6 shows a hydraulic circuit equipped with a tank at atmospheric pressure 50, comprising for each hydraulic machine 2, 4 a particular inlet duct 30. The single outlet duct 36 receiving in parallel the fluid of the two machines 2, 4, comprises a controlled output valve 70 comprising in a first position a free passage in both directions, and in a second position a non-return valve allowing a free passage of the flow upstream of the drain loop for avoid overpressure at the outlet. This output controlled valve 70 may comprise the various features presented for the inlet controlled valve 54 disposed at the inlet of the drain loop 30 on the hydraulic circuit of FIG. 3. It functions in the same way to regulate the flow rate. of this drain loop. A by-pass check valve 72 arranged in parallel with the outlet controlled valve 70, includes a setting spring for flowing the fluid from upstream to downstream from a difference threshold of 70.degree. pressure. Alternatively it is possible on each outlet duct 36a, 36b coming from a hydraulic machine 2, 4, a controlled output valve 5 clean then driving the fluid to the processing elements 42, 44 which are common to these two machines. It is thus possible with each own-controlled valve to adjust the flow rate of the drain loop individually for each hydraulic machine 2, 4, depending on its particular needs.
    [0019] In general terms, a drain loop independent of the main flow transmitting power is thus provided through the hydraulic machines 2, 4, each comprising a flow control means making it possible to optimize its flow as a function of the operating conditions. operation of these machines. This flow rate is optimized to ensure both good operating conditions of the machines guaranteeing their service lives, as well as minimum energy consumption. In general, the hydraulic circuit according to the invention can be used with different types of transmission, the transmission presented in the above-mentioned prior art document being given solely as an example of the use of this type of transmission. hydraulic circuit.
    权利要求:
    Claims (12)
    [0001]
    CLAIMS1 - Hydraulic circuit having at least one hydraulic power machine (2, 4) connected to a low pressure circuit (6) and a high pressure circuit (10) transmitting this power, the machine being equipped with a drain which allows a flow of internal leaks in its housing to a low pressure accumulator (8) or a tank at atmospheric pressure (50), characterized in that it comprises an inlet duct (30) connecting the low pressure circuit (6). ) to the housing of the machine, and an outlet duct (36) forming the drain receiving the flow of the inlet duct to the reservoir (8, 50), comprising a heat exchanger (42) and a filter (44) forming the fluid processing elements for the entire hydraulic circuit, which circuit further comprises flow control means (40, 54, 70) in the inlet and outlet conduits.
    [0002]
    2 - hydraulic circuit according to claim 1, the low pressure circuit (6) comprising a low pressure accumulator (8), characterized in that the flow control means comprises a motorized pump (40) disposed on the outlet duct (36). ), which discharges into this accumulator.
    [0003]
    3 - hydraulic circuit according to claim 2, characterized in that the inlet duct (30) has an inlet nonreturn valve (32) preventing the discharge to the low pressure circuit (6), which may comprise a spring of tare.
    [0004]
    4 - hydraulic circuit according to claim 3, characterized in that the inlet check valve (32) has a closed position in both directions, which can be controlled.
    [0005]
    5 - hydraulic circuit according to any one of claims 2 to 4, characterized in that it comprises between the hydraulic machines (2, 4) and the motor pump (40), an outward outlet comprising a closure device (46), allowing deaeration of the fluid. 30
    [0006]
    6 - hydraulic circuit according to any one of claims 2 to 4, characterized in that it comprises an intermediate reservoir 3029587 14 atmospheric pressure (48), arranged between the hydraulic machines (2, 4) and the motor pump ( 40).
    [0007]
    7 - A method of controlling a hydraulic circuit according to any one of claims 2 to 6, characterized in that it detects clogging of the filter (44) by measuring operating characteristics of the motor pump (40).
    [0008]
    8 - hydraulic circuit according to claim 1, the low pressure circuit (6) having a tank at atmospheric pressure (50), characterized in that the flow control means comprises a controlled valve (54) 10 disposed on the conduit d entry (30).
    [0009]
    9 - hydraulic circuit according to claim 8, characterized in that the controlled valve (54) has a free passage position, and a position equipped with a non-return valve blocking the passage to the hydraulic machines (2, 4). 15
    [0010]
    10 - hydraulic circuit according to any one of claims 1 to 6, 8 and 9, characterized in that the outlet duct (36) comprises an outlet nonreturn valve (38) disposed at the output of the hydraulic machines (2, 4), which blocks a return to these machines.
    [0011]
    11 - hydraulic circuit according to any one of claims 1 to 6 and 8 to 10, characterized in that it comprises a plurality of hydraulic machines (2, 4) each fed by an independent inlet duct (30) coming directly from the low pressure circuit (6).
    [0012]
    12 - Hybrid automobile vehicle having a power train using hydraulic energy, characterized in that it comprises a hydraulic circuit made according to any one of claims 1 to 6 and 8 to 11.
    类似技术:
    公开号 | 公开日 | 专利标题
    EP3227586B1|2019-01-02|Hydraulic circuit including a hydraulic machine drain provided with a flow-control means and fluid-treatment functions
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    EP3079931B1|2018-03-07|Hydraulic circuit for a hybrid vehicle comprising a very high pressure circuit and safety means in case of overpressure
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    FR3014769A1|2015-06-19|HYDRAULIC CIRCUIT FOR A HYBRID VEHICLE COMPRISING A VERY HIGH PRESSURE CIRCUIT AND A LIMITED HIGH-PRESSURE CIRCUIT
    FR2982003A1|2013-05-03|Torque transmission installation for use in vehicle i.e. car, has secondary torque output shaft arranged inside casing such that secondary pinions of shaft are arranged completely above level of lubricating liquid contained in casing
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    FR3014770A1|2015-06-19|PRESSURE ACCUMULATION SYSTEM FOR A HYDRAULIC CIRCUIT OF A HYBRID VEHICLE HAVING A CLOSED ENCLOSURE
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    EP2997287B1|2018-09-05|Transmission for a hydraulic hybrid vehicle, comprising a planetary gear train linked to a pump by a speed reducer
    WO2015040308A1|2015-03-26|Method for controlling the lubrication of a speed reducer of a motor vehicle and related lubrication device
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    FR3001923A1|2014-08-15|Traction chain for hydraulic hybrid vehicle, has pump connected with pressure accumulators and provided with blocking unit for blocking output shaft with respect to bodies of pump, where blocking unit includes clutch
    FR3033740A1|2016-09-23|HYDRAULIC MODULE ARRANGED BETWEEN A THERMAL MOTOR AND A TRANSMISSION, COMPRISING A COUPLING MEANS AND A HYDRAULIC MACHINE
    BE520187A|
    FR2825421A1|2002-12-06|Counter pressure suppressor for hydraulic motor return circuit has hydraulic assist pump with auxiliary motor driven by high pressure fluid feeding the main motor
    BE538502A|
    同族专利:
    公开号 | 公开日
    FR3029587B1|2018-12-07|
    WO2016087735A1|2016-06-09|
    EP3227586B1|2019-01-02|
    US10215275B2|2019-02-26|
    US20170328469A1|2017-11-16|
    CN107002869A|2017-08-01|
    CN107002869B|2019-06-14|
    EP3227586A1|2017-10-11|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20040103656A1|2000-11-28|2004-06-03|Frazer Hugh Ivo|Hydraulic energy storage systems|
    US20100097040A1|2006-01-17|2010-04-22|Nartron Corporation|Electronic control for a hydraulically driven auxiliary power source|
    EP2131073A1|2007-03-13|2009-12-09|TCM Corporation|Hst cooling circuit|EP3459667A1|2017-09-20|2019-03-27|Fanuc Corporation|Dielectric working fluid processor and control method of dielectric working fluid processor|US5887674A|1995-10-11|1999-03-30|The United States Of America As Represented By The Administrator Of The U.S. Environmental Protection Agency|Continuously smooth transmission|
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    FR2973302B1|2011-03-29|2016-12-02|Peugeot Citroen Automobiles Sa|VEHICLE COMPRISING A POWER-DISTRIBUTED THERMAL / HYDRAULIC HYBRID TRACTION CHAIN|FR3033529B1|2015-03-13|2018-05-18|Poclain Hydraulics Industrie|HYDRAULIC ASSISTANCE DEVICE ON VEHICLE AND METHOD FOR EMPTYING SUCH A DEVICE|
    FR3072148B1|2017-10-09|2019-10-18|Poclain Hydraulics Industrie|METHOD AND SYSTEM FOR SELF-MAINTENANCE|
    FR3072065B1|2017-10-09|2019-10-18|Poclain Hydraulics Industrie|SWING OF HYDRAULIC FLUID AT START-UP|
    WO2021074315A1|2019-10-15|2021-04-22|Moog Gmbh|Electro-hydrostatic actuation system|
    法律状态:
    2015-11-23| PLFP| Fee payment|Year of fee payment: 2 |
    2016-06-10| PLSC| Search report ready|Effective date: 20160610 |
    2016-11-21| PLFP| Fee payment|Year of fee payment: 3 |
    2017-11-21| PLFP| Fee payment|Year of fee payment: 4 |
    2018-11-27| PLFP| Fee payment|Year of fee payment: 5 |
    2020-10-16| ST| Notification of lapse|Effective date: 20200906 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1461895A|FR3029587B1|2014-12-04|2014-12-04|HYDRAULIC CIRCUIT COMPRISING A HYDRAULIC MACHINE DRAIN EQUIPPED WITH A MEANS FOR CONTROLLING FLOW RATE AND FLUID TREATMENT FUNCTIONS|FR1461895A| FR3029587B1|2014-12-04|2014-12-04|HYDRAULIC CIRCUIT COMPRISING A HYDRAULIC MACHINE DRAIN EQUIPPED WITH A MEANS FOR CONTROLLING FLOW RATE AND FLUID TREATMENT FUNCTIONS|
    US15/528,439| US10215275B2|2014-12-04|2015-11-12|Hydraulic circuit including a hydraulic machine drain provided with a flow-control means and fluid-treatment functions|
    CN201580065808.0A| CN107002869B|2014-12-04|2015-11-12|Hydraulic circuit|
    EP15808717.1A| EP3227586B1|2014-12-04|2015-11-12|Hydraulic circuit including a hydraulic machine drain provided with a flow-control means and fluid-treatment functions|
    PCT/FR2015/053057| WO2016087735A1|2014-12-04|2015-11-12|Hydraulic circuit including a hydraulic machine drain provided with a flow-control means and fluid-treatment functions|
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