Patents Assigned to Danfoss Power Solutions GmbH & Co. OHG
  • Patent number: 10830348
    Abstract: The invention relates to a hydraulic machine, in particular to a hydraulic motor with two working lines, from one of which a high pressure line and from the other one a low pressure line is branched off. An electronic control unit and a servo displacement unit are provided to control the displacement of the displacement volume of a drive mechanism of the hydraulic machine, wherein the displacement volume can be determinated by the displacement of a servo piston within the servo displacement unit. For this, the servo piston can be loaded at least on one side via a servo pressure line with hydraulic fluid under servo pressure, wherein the servo pressure level can be adjusted by a control spool arranged moveable within a control valve. For this, hydraulic fluid from the low pressure line or, perhaps, from the high pressure line is guidable via the control valve to the servo pressure line if a suitable control signal is available at a switching valve.
    Type: Grant
    Filed: May 4, 2016
    Date of Patent: November 10, 2020
    Assignee: Danfoss Power Solutions GmbH & Co. OHG
    Inventors: Suenje Marsch, Bernd Hames, Michael Hein, Arne Streblau
  • Patent number: 10677058
    Abstract: The invention provides a fluid working machine comprising: a crankshaft (2) which is rotatable about an axis of rotation (3); adjacent first and second groups (5, 6, 8, 10) of valve cylinder devices (13) spaced from each other about the axis of rotation (3), one or each of the first and second groups (5, 6, 8, 10) of valve cylinder devices having first, second and third valve cylinder devices (13) arranged about and extending outwards with respect to the crankshaft (2), the first and third valve cylinder devices being axially offset from each other, the second valve cylinder device being axially offset from the first and third valve cylinder devices and the second valve cylinder device being offset from the first and third valve cylinder devices about the axis of rotation, wherein the second valve cylinder device has an axial extent which overlaps with the axial extent of one, or the axial extents of both, of the first and third valve cylinder devices.
    Type: Grant
    Filed: May 27, 2014
    Date of Patent: June 9, 2020
    Assignees: Danfoss Power Solutions GMBH & Co. OHG, Artemis Intelligent Power Ltd.
    Inventors: Alexis Dole, Uwe Bernhard Pascal Stein, Stephen Michael Laird
  • Patent number: 10605079
    Abstract: The invention provides a fluid working machine comprising: a crankshaft (2) which is rotatable about an axis of rotation (3); adjacent first and second groups (5, 6, 8, 10) of valve cylinder devices (13) spaced from each other about the axis of rotation (3), one or each of the first and second groups (5, 6, 8, 10) of valve cylinder devices having first, second and third valve cylinder devices (13) arranged about and extending outwards with respect to the crankshaft (2), the first and third valve cylinder devices being axially offset from each other, the second valve cylinder device being axially offset from the first and third valve cylinder devices and the second valve cylinder device being offset from the first and third valve cylinder devices about the axis of rotation, wherein the second valve cylinder device has an axial extent which overlaps with the axial extent of one, or the axial extents of both, of the first and third valve cylinder devices.
    Type: Grant
    Filed: May 27, 2014
    Date of Patent: March 31, 2020
    Assignees: Danfoss Power Solutions GMBH & Co. OHG, Artemis Intelligent Power Ltd.
    Inventors: Alexis Dole, Uwe Bernhard Pascal Stein, Stephen Michael Laird
  • Patent number: 10487826
    Abstract: The invention relations to a hydraulic machine of the Dry-Case construction type comprising a hydraulic machine housing for receiving a hydrostatic driving mechanism for conveying hydraulic fluid with a driving shaft operational connected with the driving mechanism. The driving shaft is mounted rotatable about its longitudinal axis in the hydraulic machine housing. Neither the driving mechanism, nor the driving shaft nor its bearings splash or move in a sump of the hydraulic fluid. Lubricant can be pumped to bearings of the driving shaft and to the driving mechanism by a lubrication pump arranged on the driving shaft and being driven by driving shaft. The lubrication pump do not splash in a sump of the hydraulic fluid either and comprise a suction port which leads to a hydraulic fluid reservoir.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: November 26, 2019
    Assignee: Danfoss Power Solutions GmbH & Co., OHG
    Inventor: Harry Rasch
  • Patent number: 10429427
    Abstract: The invention relates to a method (3) for determining (33) a state characteristic value (28) of a electric device (4) controlled by a temporally variable control signal (17). The at least one state characteristic value (28) is determined using the frequency of the temporally variable control signal (17) and/or the switching characteristics of the temporally variable control signal (17).
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: October 1, 2019
    Assignee: Danfoss Power Solutions GmbH & Co. OHG
    Inventors: Sven Fink, Matt Saterbak
  • Patent number: 10364807
    Abstract: The invention relates to a method for actuating an electrically commutated fluid working machine (1), wherein the actuation of the electrically controllable valves (11) of the electrically commutated fluid working machine (1) is effected dependent on the fluid requirement and/or mechanical power requirements. In addition, on actuation of the electrically controlled valves (11) the electrical power required for actuating the electrically controllable valves is taken into account.
    Type: Grant
    Filed: September 23, 2013
    Date of Patent: July 30, 2019
    Assignee: Danfoss Power Solutions GmbH & Co. OHG
    Inventor: Sven Fink
  • Patent number: 10364885
    Abstract: Method for the load-dependent regulation of a hydrostatic drive (1), with a closed hydraulic fluid circuit comprising a first hydraulic motor (5) and, parallel to this, a second hydraulic motor (6), whereby both hydraulic motors (5 and 6) are capable of being powered by a hydraulic pump (3) via a high-pressure line (7) and a low-pressure line (8) and are mechanically coupled to each other via a transmission (70). The displacement of the first hydraulic motor (5) can be adjusted proportionally to an electrical signal of an electronic control system (50) by means of an electro-proportional control valve (10) and the displacement of the second hydraulic motor (6) can be adjusted by means of a pressure-proportional control valve (20) which is hydraulically connected to the high-pressure line (7) via a control pressure line (21). The pressure-proportional control valve can be activated by means of a control pressure which is dependent on the high pressure.
    Type: Grant
    Filed: April 14, 2016
    Date of Patent: July 30, 2019
    Assignee: Danfoss Power Solutions GmbH & Co. OHG
    Inventor: Rolf Rathke
  • Patent number: 10359127
    Abstract: The invention to a valve unit (1) for a synthetically commutated fluid working machine (51), comprising a valve body (19,57), a movably arranged valve unit (3) and a separate fluid flow influencing unit (13, 25, 31, 35, 46, 56). The fluid flow influencing unit (13, 25, 31, 35, 46, 56) comprises a fluid flow influencing means part (18) and an attachment means part (28, 34, 38) for mechanical connection with the valve body (19). The attachment means part (28, 34, 38) and the fluid flow influencing unit (18) are connected to each other by a connection means part (27, 30, 33, 40, 47). The circumferential extent of the attachment means part (28, 34, 38) is larger as compared to the circumferential extent of the connection means part (27, 30, 33, 40, 47).
    Type: Grant
    Filed: May 14, 2014
    Date of Patent: July 23, 2019
    Assignees: Danfoss Power Solutions GmbH & Co. OHG, Artemis Intelligent Power Ltd.
    Inventors: Alexis Dole, Jack Samuel Lavender, Fergus Robert McIntyre, Jens Dominik Willy Eilers
  • Patent number: 10330186
    Abstract: A power split transmission and a method of merging the power flows of the power split transmission are provided. A power input shaft drives a planetary gear set splitting the input power into a power flow over a variable power branch and into a power flow over a mechanical power branch. The power flows can be merged for driving a power take-off shaft. A reverser includes a first clutch, a second clutch, a first gear set and a second gear set. By engaging the first clutch and disengaging the second clutch the first gear set is driven, if an output shaft of the variable power branch and a mechanical transmission shaft are counter-rotating. By engaging the second clutch and the first clutch disengaging the second gear set is driven, if the output shaft of the variable power branch and the mechanical transmission shaft are co-rotating.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: June 25, 2019
    Assignee: Danfoss Power Solutions GmbH & Co. OHG
    Inventors: Jens Bagusch, Torsten Kohmäscher
  • Patent number: 10281034
    Abstract: Hydrostatic transmission and method for decelerating a hydrostatic transmission with a closed hydraulic fluid circuit, in which a hydraulic pump drivable by a drive engine and a hydraulic motor are arranged and connected fluidly to one another through two working lines. Alternately depending on the operational mode and on the conveying direction of the hydraulic pump, one working line is the low pressure line and the other one is the high pressure line. The hydraulic pump as well as the hydraulic motor are adjustable in their respective displacement volumes by means of a control unit. The hydraulic motor comprises a housing in which a hydrostatic drive mechanism having an inlet and an outlet is arranged. In a connecting line connecting the outlet and the inlet a pressure control valve is arranged, which can be flown through in direction to the inlet. The pressure control valve opens if the high pressure present at the outlet exceeds a predetermined pressure limit of the pressure relief valve.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: May 7, 2019
    Assignee: Danfoss Power Solutions GmbH & Co. OHG
    Inventor: Andreas Schumacher
  • Patent number: 10267399
    Abstract: The invention relates to a charge pump system (190) comprising a hydrostatic charge pump (12) capable to generate a hydraulic flow rate to be fed into a closed circuit of a hydrostatic transmission, a planetary gear set (20), whose planet wheel carrier (22) is connected to an input shaft (11) of the charge pump (12), and whose sun wheel (21) is driveable by a driving shaft (3); and a charge pump motor (30) capable to drive the ring gear (23) of planetary gear set (20).
    Type: Grant
    Filed: January 11, 2017
    Date of Patent: April 23, 2019
    Assignee: Danfoss Power Solutions GmbH & Co. OHG
    Inventor: Andreas Schumacher
  • Patent number: 10267341
    Abstract: The invention relates to a method and a device for determining of at least one end position of a displacement element of an adjustable hydraulic machine, in particular of the axial piston type, shiftable or displaceable between two ends position a by means of a displacement unit between a first end position and a second end position. According to the invention the determination of having reached an end position of displacement takes place by means of a measurement circuit, whose electrical characteristics are changed jumpily when an end position is reached. This is done by connecting a partial branch of the measuring circuit with earth, when a moveable element comes into electric contact with a limit stop assigned to the corresponding end position.
    Type: Grant
    Filed: March 22, 2016
    Date of Patent: April 23, 2019
    Assignee: Danfoss Power Solutions GmbH & Co. OHG
    Inventors: Suenje Marsch, Rolf Rathke, Stephan Kaiser, Edat Kaya
  • Patent number: 10252195
    Abstract: The invention relates to a high-pressure hydraulic fluid screening element (1) for inserting into a hydraulic line or into a hydraulic connection of a hydraulic device, having an annular main body (2), which is aligned with respect to its axis of rotation (9) in a longitudinal direction (5). The outside diameter of the main body (2) is greater than its axial length. The inner cross section of the main body (2) is covered over by a screening region (3), which is provided with a multiplicity of apertures (4). In this case, the main body (2) and the screening region (3) are produced integrally by the powder injection-molding process.
    Type: Grant
    Filed: June 5, 2015
    Date of Patent: April 9, 2019
    Assignee: Danfoss Power Solutions gmbH & Co. OHG
    Inventor: Reinhardt Thoms
  • Patent number: 10227996
    Abstract: The invention relates to a displacement unit (1) of a hydraulic machine, for which the hysteresis is reduced. For this purpose, in the control spool (3) and/or at the control spool (3) a mass body (16) and a spring (17) are arranged, which are excited to resonance vibrations. The vibrations are self-excited and sustained by a partial flow rate of the hydraulic fluid which is modulated periodically. The high frequent vibrations are transmitted over the spring (17) onto the associated control spool (3), thereby reducing the friction and hence the hysteresis.
    Type: Grant
    Filed: September 9, 2016
    Date of Patent: March 12, 2019
    Assignee: Danfoss Power Solutions GmbH & Co. OHG
    Inventors: Reinhardt Thoms, Martin Wuestefeld
  • Patent number: 10183852
    Abstract: A hydraulic control system that uses system pressure information and a rescaled operator input to command valve spool area to control actuator speed. The system uses soft sealing and/or soft pressure compensation.
    Type: Grant
    Filed: June 15, 2016
    Date of Patent: January 22, 2019
    Assignee: Danfoss Power Solutions GMBH & CO OHG
    Inventors: Abhijit Das, Lee Mahlum, Luke Wadsley, Richard Hitchcock, Jeffrey A. Sipila, Larry Joachim
  • Patent number: 10167882
    Abstract: A valve housing includes a cylindrical valve bore with a high pressure inlet, a low pressure inlet and a discharge outlet. A first flushing valve spool is arranged elastically pre-stressed within the valve bore for enabling a fluid connection between the low pressure inlet and the discharge outlet. A shuttle valve spool is arranged elastically pre-stressed within the valve bore for enabling the fluid connection between the low pressure inlet and the discharge outlet. The first flushing valve spool is moveable into an open position if the fluid pressure at the low pressure inlet exceeds a first threshold value, and the shuttle valve spool is moveable into an open position for connecting the low pressure inlet with the discharge outlet, if the pressure difference between the high pressure inlet and the low pressure inlet exceeds a second threshold value.
    Type: Grant
    Filed: February 24, 2016
    Date of Patent: January 1, 2019
    Assignee: Danfoss Power Solutions GmbH & Co. OHG
    Inventor: Arne Streblau
  • Patent number: 10012228
    Abstract: A variable fluid flow hydraulic pump including one or more displacement bodies having a fixed volume chamber. Within this fixed volume chamber a piston cycles or reciprocates thus providing for the movement of fluid. Also present is a low pressure valve connecting said displacement chamber with the low pressure side. Additionally, a high pressure valve may be provided on the high pressure side. The low pressure valve is provided with an adjustable element or Fcontrol providing an opening force thereon and further providing a closing force, which periodically increases during the pumping stroke and decreases during the suction stroke of said piston reciprocating within the displacement body and further includes an element to supply fluid from the low pressure side to said fixed volume chamber of the displacement body while the pressure in the displacement chamber is less than that of the low pressure side.
    Type: Grant
    Filed: April 7, 2015
    Date of Patent: July 3, 2018
    Assignee: Danfoss Power Solutions GmbH & Co. OHG
    Inventor: Hans Esders
  • Patent number: 9976649
    Abstract: Method for deceleration of a hydrostatic transmission 3 driven by a drive motor 2 comprising a closed hydraulic fluid circuit, in which a hydraulic pump 4 coupled mechanically with the drive motor 2 and a hydraulic motor 5 are arranged. Two hydraulic lines 6, 7 connect the hydraulic pump 4 and the hydraulic motor 5 and constitute for the hydraulic motor 5 according to the drive direction of the hydrostatic transmission 3 a supply line 6 and a return line 7.
    Type: Grant
    Filed: July 20, 2015
    Date of Patent: May 22, 2018
    Assignee: Danfoss Power Solutions GmbH & Co. OHG
    Inventors: Reinhardt Thoms, Martin Wuestefeld
  • Patent number: 9932957
    Abstract: Hydrostatic adjusting device of a hydraulic machine, the swept volume of which can be adjusted by way of a servo adjusting unit, having a control unit which has a control cylinder which has at least one inlet for pressurized hydraulic fluid, at least one servo connector for a connecting line to the servo adjusting unit, and at least one outlet to a hydraulic fluid collecting region. A control piston is arranged in the control cylinder, which control piston can be displaced by means of at least one control piston actuator and has control edges. In interaction with control edges which are configured in the control cylinder, the inlet or the outlet can be alternately connected hydraulically to the connecting line, whereby the pressure which prevails in the connecting line can be returned hydraulically via a control line to at least one end side of the control piston.
    Type: Grant
    Filed: April 3, 2015
    Date of Patent: April 3, 2018
    Assignee: DANFOSS POWER SOLUTIONS GMBH & CO OHG
    Inventors: Reinhardt Thoms, Martin Wuestefeld
  • Patent number: 9879532
    Abstract: The invention relates to a hydraulic axial piston machine (1) of dry case type of construction, whose case (2) is provided for connection to a gearing case (21) so as to form a fluid-tight overall case. The case (2) has openings (10) which permit the passage of leakage hydraulic fluid or of lubricant into the gearing case (21). By means of this design, splashing losses of the axial piston machine (1) are eliminated, and the leakage hydraulic fluid or the lubricant serve for the lubrication both of the axial piston machine (1) and of the gearing (20).
    Type: Grant
    Filed: May 27, 2015
    Date of Patent: January 30, 2018
    Assignee: DANFOSS POWER SOLUTIONS GMBH & CO OHG
    Inventor: Wilhelm Goellner