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公开(公告)号：US10227996B2
公开(公告)日：2019-03-12
申请号：US15260567
申请日：2016-09-09
发明人： Reinhardt Thoms , Martin Wuestefeld
摘要： 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.
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公开(公告)号：US20170356471A9
公开(公告)日：2017-12-14
申请号：US15260567
申请日：2016-09-09
发明人： Reinhardt Thoms , Martin Wuestefeld
CPC分类号： F15B9/04 , F04B1/32 , F04B49/002 , F15B13/0402 , F15B21/12 , F15B2211/20553
摘要： 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.
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公开(公告)号：US20170089362A1
公开(公告)日：2017-03-30
申请号：US15260567
申请日：2016-09-09
发明人： Reinhardt Thoms , Martin Wuestefeld
CPC分类号： F15B9/04 , F04B1/32 , F04B49/002 , F15B13/0402 , F15B21/12 , F15B2211/20553
摘要： 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.
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公开(公告)号：US10422360B2
公开(公告)日：2019-09-24
申请号：US15260710
申请日：2016-09-09
发明人： Reinhardt Thoms
IPC分类号： F16K11/07 , F15B15/14 , F15B15/20 , F16K17/04 , F15B13/044
摘要： A Control unit of a hydraulic unit comprises a control piston slidable arranged in a control cylinder to provide a hydraulic fluid under servo pressure at a first outlet of the control unit suitable for the displacement of the hydraulic unit. The servo pressure is proportional to a sum of the inner forces of the hydraulic unit and the operational forces act on the control unit. The hydraulic fluid provided at the outlet is fed by a charge pressure supply at charge pressure at an inlet of the control unit. The control piston has a blind bore in the direction of a longitudinal axis of the control unit, in which a pressure relief valve is arranged functioning as a pilot-control unit having a two-sided pressure relief piston arranged in the blind bore and slidable relative to the control piston by means of an actuator.
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公开(公告)号：US20170089367A1
公开(公告)日：2017-03-30
申请号：US15260710
申请日：2016-09-09
发明人： Reinhardt Thoms
摘要： A Control unit (2) of a hydraulic unit comprises a control piston (3) slidable arranged in a control cylinder (4) to provide a hydraulic fluid under servo pressure (P2) at a first outlet (8) of the control unit (2) suitable for the displacement of the hydraulic unit. The servo pressure (P2) is proportional to a sum of the inner forces of the hydraulic unit and the operational forces act on the control unit (2). The hydraulic fluid provided at the outlet (8) is fed by a charge pressure supply at charge pressure (P1) at an inlet (7) of the control unit (2). The control piston (3) has a blind bore (5) in the direction of a longitudinal axis (13) of the control unit (2), in which blind bore (5) a pressure relief valve (20) is arranged functioning as a pilot-control unit having a two-sided pressure relief piston (23) arranged in the blind bore (5) and slidable relative to the control piston (3) by means of an actuator (6), such that by displacement of the pressure relief piston (23) reduced charge pressure acts as a hydraulic set pressure (P4) both on the medial front face (26) and on the distal front face (27) of the pressure relief piston (23) and acts on the front faces (12) of the control piston (3). The control piston (3) is displaceable in the control cylinder (4) by the sum of the pressure forces generated by of the set pressure forces generated by of the set pressure (P4) and the force of the actuator (6).
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