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公开(公告)号：US20240200454A1
公开(公告)日：2024-06-20
申请号：US18541945
申请日：2023-12-15
CPC分类号： F01B1/0686 , F01B1/0675 , F01B25/02
摘要： A hydraulic control circuit for a hydraulic motor operable at least at two displacements, having a proportional speed control valve with a control valve spool continuously moveable by means of a force generated by a pilot pressure being controlled by a continuously, electrically adjustable pilot valve having an electrical actuator, wherein the control valve spool is moveable between a full-torque end position, a reduced-torque end position, and at least one intermediate position. A time related control current function is provided for controlling the current applied to the electrical actuator for controlling the pilot pressure including a pre-current portion with a constant non-zero current and a current ramp portion during which the current is raised or lowered continuously from a ramp starting current level to an intermediate current level. The current is changed abruptly to a switching current level at the end of the current ramp portion for allowing the movement of the speed control valve spool from one of the two end positions via the at least one intermediate switching position into the other end position.
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公开(公告)号：US11933283B2
公开(公告)日：2024-03-19
申请号：US17739470
申请日：2022-05-09
发明人： Peter Bahna , Reinhardt Thoms , Andrej Babusa
CPC分类号： F04B1/324 , F04B49/002 , F04B49/08
摘要： Manual displacement control device (MDC) for hydraulic units has an input shaft mounted rotatably about an input shaft axis in an input shaft block. The input shaft protrudes from the input shaft block with a first end, onto which a rotating torque can be applied. The MDC further includes a control spool housed in a control housing, which is moveable by means of rotating the input shaft for controlling a servo pressure. The control device has positioning means for adjusting and fixing the lateral position of the input shaft with respect to the control housing in a direction perpendicular to the input shaft axis and perpendicular to the direction of a restoring force exerted on the input shaft. The hydraulic unit is adjustable to its neutral position by means of a servo spring bracket providing an end stop surface for a servo spring seat towards the displacement element. The servo spring bracket is variably fixable to the hydraulic unit housing in a manner so that the orientation of the end stop surface can be adjusted parallel to the neutral position of the displacement element.
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公开(公告)号：US11879443B2
公开(公告)日：2024-01-23
申请号：US16658528
申请日：2019-10-21
发明人： Jan Widderich , Hauke Marsch , Björn Dörntge
CPC分类号： F04B1/2085 , F04B1/328 , F16D3/205 , F16D3/2055 , F16D3/24 , F04B1/24 , F04B1/324 , F16C2360/00 , F16D2300/12 , Y10S464/905
摘要： A joint for the angularly adjustable drive-connection of a cylinder block and a driveshaft of a hydrostatic bent axis piston unit. The joint has a shank which is rotatable about its longitudinal axis defining a joint axis, on both ends of the shank roller carriers project radially and basically perpendicular to the joint axis. On each roller carrier a roller is provided rotatable around a roller axis. The rollers are secured in axial direction against slipping-off of the roller carriers by means of an embossed area located axially outside of the roller on the respective distal end portion of the roller carrier.
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公开(公告)号：US20230417323A1
公开(公告)日：2023-12-28
申请号：US18248813
申请日：2021-07-30
发明人： Lena DABELSTEIN
IPC分类号： F16H61/4043 , F04B49/24 , F16H61/4026
CPC分类号： F16H61/4043 , F04B49/24 , F16H61/4026 , F15B2211/20561 , F15B2211/27 , F15B2211/5157 , F15B2211/528 , F15B2211/555
摘要： A hydraulic valve block for a hydraulic unit includes a high-pressure port, a low pressure port, a pilot valve having a pilot valve spool, and a bypass valve having a bypass valve spool. The pilot valve connects in an initial position a control line to a discharge area. The pilot valve is switched by means of a force whose height depends on the pressure level at the low pressure side to a shifted position in which the pilot valve conducts pressure from the high-pressure port to the control line. The bypass valve switches from a closed position in which a fluid connection between the high pressure port and low pressure port is disabled, to an open position in which a fluid connection between the high pressure port and low pressure port is enabled, if the control line connected to an opening surface of the bypass valve, is not connected to the high-pressure port.
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公开(公告)号：US11761435B2
公开(公告)日：2023-09-19
申请号：US17555586
申请日：2021-12-20
发明人： Jaromir Tvaruzek , Heiko Laffrenzen
IPC分类号： F16C19/36 , F16C19/50 , F16C35/077 , F04B1/148 , F16C33/58
CPC分类号： F04B1/148 , F16C19/364 , F16C19/502 , F16C33/583 , F16C35/077 , F16C2360/42
摘要： A cradle bearing for supporting a swashplate of a variable hydraulic axial piston. The cradle bearing is of an angular ball bearing type or comprises, with respect to the bearing axis, a tapered inner race and/or a tapered outer race. A swashplate for a variable hydraulic axial piston unit including a first and a second cradle bearing zone spaced to each other in axial direction of a swashplate tilt axis, suitable for supporting the swashplate in a housing of a variable hydraulic axial piston unit, wherein the first cradle bearing zone is inclined with respect to the swashplate tilt axis. A variable hydraulic axial piston unit of the swashplate type including a swashplate which is supported rotatable in the housing of the variable hydraulic axial piston unit at a first bearing zone by a tapered bearing and at a second bearing zone by regular cylindrical cradle bearing or a journal bearing whose axis is aligned with the swashplate tilt axis.
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公开(公告)号：US11499552B2
公开(公告)日：2022-11-15
申请号：US15572226
申请日：2016-05-06
发明人： Elliott Gruber , Luke Wadsley
IPC分类号： F04C15/00 , F04C29/00 , F04C29/06 , F04B53/16 , F04B39/12 , F04C2/02 , F04C2/16 , F04C2/18 , F04C2/12 , F04C2/344 , F04C18/02 , F04C18/16 , F04C18/18 , F04C18/12 , F04C18/344 , F04C15/06 , F04C29/12 , F04B11/00
摘要： A fluid working system such as a pump for displacing a working fluid such as hydraulic fluid or a motor using a working fluid is provided. The system may have a positive displacement machine which includes one or more working chamber with displacement means such as a cylinder with a reciprocating piston. There are also two or more fluid ports to allow the working fluid to flow into and out of the working chamber. The working fluid flows from one fluid port means to another either being forced to do so when pumped or moving the piston when functioning as an engine. The fluid working system has associated therewith a non-dead compliance volume of a material such as syntactic foam. This compliance volume acts to smooth any pressure fluctuations within the working fluid system.
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公开(公告)号：US10662773B2
公开(公告)日：2020-05-26
申请号：US15815859
申请日：2017-11-17
摘要： Hydraulic axial piston unit (1) of the swashplate construction type having a drive shaft (2) adapted to drive or be driven by a cylinder block (4). The cylinder block comprises a plurality of cylinder bores (6), in which several pistons (8) are moveable in general along the rotational axis (10) of the drive shaft (2) and relative to the cylinder bores (6). First ends of the pistons (8) protrude outside of the cylinder bores (6) and are slidable fixed by means of slippers (14) to a swashplate (16). The slippers (14) are hold down in a sliding manner on a sliding surface (18) of the swashplate (16) by means of a slipper hold down ring (20) arranged parallel to the sliding surface (18). The slipper hold down ring (20) is in a sliding contact with its radial inner surface (22) with a matching surface (26) on a guide ball (24) rotationally fixed on the drive shaft (2) and axially moveable in direction of the rotational axis (10) relative to the cylinder block (4) against resilient forces of springs (28) characterized in that a mounting ring (30) is attached to the cylinder block (4) in order to limit the axial movement of the guide ball (24) towards the cylinder block (4).
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公开(公告)号：US10364807B2
公开(公告)日：2019-07-30
申请号：US14430751
申请日：2013-09-23
发明人： Sven Fink
摘要： 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.
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公开(公告)号：US10281034B2
公开(公告)日：2019-05-07
申请号：US14919832
申请日：2015-10-22
发明人： Andreas Schumacher
IPC分类号： F16H61/421 , F16H61/431 , F16H61/4157 , F16H39/02 , F16H61/4017 , F16H59/68
摘要： 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. During the coasting operation of the hydrostatic transmission the displacement of the hydraulic pump and/or of the hydraulic motor are adjustable by means of the control unit in function of the speed of the drive motor or of the speed of the hydraulic pump.
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公开(公告)号：US10252195B2
公开(公告)日：2019-04-09
申请号：US14732027
申请日：2015-06-05
发明人： Reinhardt Thoms
摘要： 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.
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